#video from #Kurzgesagt about the #Hugging-Face-Incident, probably the best thing to tell people about #AI #security
on 02026-10-05#video of #Dwarkesh #interview with #Ajeya-Cotra about the #Hugging-Face-Incident
on 02026-10-05#news #video of Jacob #Coxon testifying for the #New-York city council (⸘‽) about #AI safety and the #Hugging-Face-Incident
on 02026-10-05#video about how #PewDiePie is developing #AI called "Odysseus"‽ And got banned from #OpenAI for distillation. So he’s using GRPO on his own hardware. This has to be a joke.
on 02026-10-05#video #toread of an adobe country dwelling in Argentina (47')
on 02026-10-05#video #toread of part 8 of a #ferrocement #dwelling (32')
on 02026-10-05#video #toread on a #ferrocement tank with a temporary inner form (20')
on 02026-10-05#video #toread on the cheapest #ferrocement wall (19')
on 02026-10-05#video #toread on a #ferrocement cafeteria (5')
on 02026-10-05#Breaking-Taps #video about how he got silicon #electronics fabricated (through #WaferSpace #MPW, not a multi-project chip). He settled on a MOV machine (transport-triggered architecture) called BTTAP, designed it in the Spade #HDL, synthesized it with Yosys and ABC, and simulated it for SKY130. Includes animations of some analog simulations. He tested his RTL (?) in cocotb instead of Verilator and viewed his waveforms with Surfer instead of gtkwave. Then he used LibreLane, which wafer.space provides as a #Nix Flake, to get from a netlist to GDSII. Finally wafer.space got it fabbed through GlobalFoundries’ GF180 process, which I didn’t know had an open-source PDK, in only 3-4 months. Wafer.space got some of the chips packaged as COB with transparent epoxy. He got about 1000 chips. From looking at MPW pricing in the past, I’d estimated that this cost him about US$2500, but I think it was actually US$5000. wafer.space GF180MCU run 3 is in December, early-bird price for a quarter-size chip (1.94 × 2.53 mm) of only US$2000.
on 02026-09-22#video review of #Anthropic’s #Claude Opus 5.5, which came out today. He had it write some 3-D games from a single prompt, using threejs, #Godot, and just plain C++ with no dependencies. He was not able to get it to drive a simple robot arm to push a toy car across a mat, though. “This model slaps.” #AI #LLMs #neural-networks
on 02026-09-22#video by #Lukes-Dev-Lab testing a new #Qwen finetune, a DavidAU’s 4-bit quantization of Qwen3.8-27B-TURBO-Fable-Cold-Fusion-735-882-Heretic-Uncensored-NEO-CODER-MAX-MTP-GGUF, which performs amazingly at some software development tasks, especially front-end web dev, although it fails at #Godot development. #LLM #AI #neural-networks
on 02026-09-22#video #lecture by John #Ousterhout about how his new RPC protocol #Homa improves tail #latency compared to TCP/IP and RDMA (RoCE)
on 02026-09-22#humor #video about how the #EU impedes technical innovation and how it’s hard to start startups there
on 02026-09-22#video #toread about #Freenet and services without servers. #decentralization
on 02026-09-22#video #toread about the aestheticization of #politics in modern #fascism
on 02026-09-22#video #toread #formina of a luxury train trensolidario.org that goes 1200km from Haedo to Senillosa, Neuquén, in 50 hours, with a misleading title that says it goes to Patagonia instead. The fare is 20kg of non-perishable food. The car is a wood-paneled “Pullman” car from the mid-01950s that has recently been restored.
on 02026-09-22#Video of Andrew Kelley's #lecture at #SXSW this year saying that (specifically for #AI) “if you don’t control the source code, you are not in control,” claiming AI agents are under the control of AI companies, which is of course true. There’s a section about disliking AI but using it anyway, and a section explaining how #Anubis is killing the open Web.
Very clear statement about the value of #free-software: “It primarily matters whether high-quality free software is available to users, providing competition that limits the degree to which proprietary software can get away with being coercive.” #toread
on 02026-09-22#Tsoding #3D #tutorial #video with wireframes
on 02026-09-22#video #lecture by Peter Alvaro of UCSC at Strange Loop about disorderly systems and “I see what you mean: what a tiny language can teach us about gigantic systems” #toread
on 02026-09-22#video #formina #toread on 11 weird #USA #English accents
on 02026-09-19glacial acetic acid #materials #video #toread, part 2, where he actually does the reaction.
on 02026-09-15#AI #video recommended #toread, something about #self-hosting
on 02026-09-03#EEVBlog #video about PCB #manufacturing #toread. #electronics #hardware
on 02026-09-03#Usagi-Electric #video #toread discussing #JLCPCB #pricing having higher shipping costs now for #electronics #hardware #manufacturing
on 02026-09-03#Video by #Eurocircuits about #manufacturing 4-layer PCBs. They do PCB manufacturing, specialized in small prototype runs, but I don’t think they do PCBA like Aisler, JLC, or PCBWay. They do “order pooling” like JLC: they put multiple customers’ designs into a single panel. #toread #electronics #hardware
on 02026-09-03#Video #toread about a 14-megabyte #AI model that can apparently run on an #ESP32 or something?
on 02026-09-03#Video from #Tr3bol Argentina about how in #electronics you often see badly-designed off-the-shelf step-up and step-down dc-dc converter modules built around LM2596 or XL4015 #hardware for buck converters, or the 1.2MHz ML3608 (which she doesn’t recommend using) for boost converters, and how you ought to really just build your own to make sure it works. She says they’re noisy (though I notice she didn’t bother to specify the volts per division on her oscilloscope still photo, but later she said it was 140mV ripple, while her own design got the ripple down to 60mV) and that you can accidentally set the voltage wrong, or vibrate or heat your potentiometer to the wrong voltage (in the schematic she shows, it isn’t ratiometric, so you have temperature drift). Also, humidity. Also, often, she says the commercial module PCBs are badly laid out, creating EMI problems and not respecting safety standards, use counterfeit chips, and are inadequately heatsinked. Most of the video is just still photos with lots of talking-head filler.
on 02026-09-03#Video of new Audacity 4.0 #UX #toread
on 02026-09-03#Screencast #video of improvements to #LaTeX previews in #Emacs #org-mode which might already be in Org 9.7
on 02026-09-01#Video on using #Emacs #org-mode instead of #Jupyter? #toread
on 02026-09-01#video #toread about four 512GiB Mac Studios writing an app in four hours by #self-hosting #AI.
on 02026-08-31#Steve-Mould #video on counterflow heat exchangers; he built a tube-in-tube one using a clear outer hose and a copper inner pipe with a spiral of copper wire around it as a spacer. Mentions counterflow washing used in mining, which is a sort of semi-batch process with a series of washing tanks, which I hadn’t heard of before, with solids being progressively moved to cleaner and cleaner tanks in the cascade.
on 02026-08-27#DIY #video about molding gray and brown concrete in silicone molds to make trays and cups and stuff. Suggests using a hammer drill on the non-rotating setting, or a Theragun vibrator, to vibrate air out of the molds after setting them on top of a wooden board. He likes cutting lids for the concrete things out of hardwoods. No thoughts on concrete reinforcing fillers or foaming. He suggests using a box cutter or screwdriver to trim flash or sharp corners, or a sander or angle grinder, or just rubbing the edges of the (presumably mostly uncured) concrete against a block of wood because it “breaks off all the little crumbly pieces”. He also suggests curing the pieces underwater, ideally in distilled water. Finally he applies some kind of “sealant or curing finish” after letting the cured concrete dry for a week, preferring a few layers of Home Depot cutting board mineral oil. In one case he tried coating the bottom with TotalBoat epoxy resin with black pigment, setting the pieces face down on a silicone mat to cure, trimming the epoxy overflow with an X-Acto knife perhaps a bit later than he should have, or in one case a wood router with a flush-trim bit. For making silicone molds, he recommends Smooth-On Mold Star 30 around forms made of legos
on 02026-08-27#Music #video playlist of "Otyken", a Mongolian folk rock band
on 02026-08-26#Humor #video of inept food menu translations, including items such as “unsuspecting tyrant double-decker beef fort”, “fried rolled-up trousers with fish sauce”, and “sausage in the father-in-law”
on 02026-08-26#Humor #video of inept #Chinese #tattoos analyzed by “Chinese by Jessie”
on 02026-08-26#Humor #video of Google Lens misidentifying and mistranslating things
on 02026-08-26#Video from ultra-right-wing broadcaster Sky #News reporting that #CIA director John Ratcliffe made an unannounced flight to Moscow to talk to Russia (specifically Sergey Naryshkin, head of the SVR), possibly over #Iran. Apparently the CIA is in charge of #USA #politics now? #Interview with Michael Clarke, who also discusses a new offensive by #Ukraine in the war, where they’re apparently able to use conventional armor again.
on 02026-08-26#Video about horseshoe crabs in New Jersey and the threats to their population; not humor despite being by Ze Frank, except for the title and the credits, trying to raise funds for the Wetlands Institute and their “Return the Favor” volunteer programs for horseshoe crab rescue.
on 02026-08-26#Humor #video of Reddit posts (etc.) read in a humorous voice
on 02026-08-26#Video by art-history YouTuber #Brush-with-Bekah (Harding) about a #witch-burning attempt directed at her by an anti-nuclear TikToker who falsely claimed to work in radiation safety because she made uranium yellow paint from carnotite (which was sold to her as yellowcake). #Interview with professor Matthew Memmott, who blames Malthusians and oil companies in the 01960s and 01970s for the political and regulatory clampdown on #nuclear-energy, according to Richard Rhodes’s Energy.
on 02026-08-26#Video #toread about a computer powered by fire #energy
on 02026-08-26#video of the largest insects from each continent, ending in South America with the Actaeon Beetle, whose grubs can grow to 228g.
on 02026-08-25#video of cats being scared by, mostly, people wearing cat masks and costumes. #humor
on 02026-08-25#cartoon #video compilation of Felix the Cat, including the public-domain “Felix the Cat Gets the Can”, from 01924; “Felix the Cat in Woos Whoopie” from 01930, “Felix the Cat in Sure-Locked Homes” from 01928, “Felix the Cat in Futuritzy”, and “Feline Follies”. These seem to nearly all be from the silent-film era; they are nearly all in black and white and frequently feature speech bubbles and occasionally intertitles. There is an obtrusive “8thmandvd.com Cartoon Classics!” logo overlaid. He’s supposedly one of the most famous examples of the #rubber-hose #animation style in #history, Bill Nolan having introduced the style when animating him, and these cartoons are exemplary of the style. The “Woos Whoopie” section starting around 2h18m has many sound effects (laughter, whimpers of fear, footsteps, car-engine sounds, cuckoos, horn blasts, etc., rather than just an orchestral score) but no spoken dialogue.
One exception is “Felix the Cat and the Goose that Laid the Golden Egg”, from 01936, in “Burt Gillett’s Rainbow Parade Cartoon in Technicolor”, at the very beginning, which also has both spoken and sung dialogue, and is notable for being a pirate cartoon from before the “Treasure Island” movie estabished the “pirate accent,” so Captain Kidd and the other pirates speak General American. The drawing style is also noticeably less rubber-hosey, with well-defined elbows. This is followed by “Felix the Cat in Neptune Nonsense”, also from 01936, also in color with spoken dialogue and elbows, as well as an orchestral score. And “Felix the Cat in Bold King Cole”.
Felix does not have his “bag of tricks” in this incarnation.
on 02026-08-25#Jonesy-Makes #video of restoring a Victorian-era ruling engine for #machining rulers on brass or possibly steel. #manufacturing #history #metrology
on 02026-08-25#politics #news #video about how the #New-START treaty, the last #nuclear-weapons #disarmament treaty, signed in 02010 by #Obama and #Medvedev, expired on 02026-02-04. #Interview material with Sophie Bolt and Eliana Johns. #History of disarmament treaties with stock photos; between START in 01991 and 02009, warhead stockpiles declined 82%. The history of the “nuclear taboo”. For some reason there’s a lot of blurred stock footage of Kermit the Frog. George W. Bush pulled out of the ABM treaty with the #GWOT as an excuse, and the next day Russia withdrew from the 01991 START II. #China’s #no-first-use policy and attempt to establish it as an international standard.
on 02026-08-25#WSJ #news #video saying #The-Line (and the rest of Neom) has failed in #Saudi Arabia “over the last nine months or so”. Lots of talking-head filler. “Construction on all the major projects has stopped or is winding down.” But Yasir al-Rumayyan says that nothing has been canceled, just reprioritized, because it’s not “necessary” to deliver The Line by 02030. The golf courses in Sindalah have turned brown. The US$500B initial budget (up to 02080) has ballooned to US$8.8T. So they’re focused on "Oxagon", the port part of Neom.
on 02026-08-25#GreatScott #video on #FOC #control #electronics for #brushless #motors #toread
on 02026-08-25#Casual-Geographic #video about #hyenas that corrected misconceptions I had. #toread
on 02026-08-25cartoon #video about the history of technological development, claiming that Çatal Höyük (#Catalhoyuk) got rich selling its #obsidian. Incorrectly claims that chalcolithic axes (and chisels, knives, saws, drills, etc.) were cast, and incorrectly claims that chalcolithic copper was entirely smelted from ore, when in fact we know that native copper is common even today. Incorrectly claims that the first bronze was a tin-copper alloy, rather than arsenical bronze. Incorrectly claims that bronze can take harder hits than copper. Presumably there are more major errors in the rest of the video I didn’t watch. #Plonk to "The Grainbound" for unforgivable levels of sloppiness about historical truth.
on 02026-08-25#Tutorial #video by #Excessive-Overkill about field-oriented #control (#FOC), promising “from the ground up.” #electronics #hardware #toread
on 02026-08-25#Materials #video about “scagliola” and other forms of fake marble rock for architecture. #toread
on 02026-08-25#MrCarlson’s Lab #video about antiparallel diodes for front-end voltage limiting (in particular for radio receivers), mentioning that diode-connected transistors are less leaky. He also vividly illustrates diodes as temperature sensors by heating one with his finger while connected to an Agilent U2152A multimeter with a 4-digit diode-test function; the forward voltage drops from .6246V to .6214V, 100μV at a time, from the finger heating, then resurges to .6246V after he removes his finger. Basic #electronics introduction video.
on 02026-08-25#video of the hardest #English words for Spanish speakers. #formina
on 02026-08-25#CodysLab #video of “continuous feed jar for infinite pickles”
on 02026-08-25#video of #graphics #algorithms “SIGGRAPH 2026 Papers Fast Forward” #toread (2½ hours)
on 02026-08-25#video of #graphics #algorithms “SIGGRAPH Thesis Fast Forward 2025” #toread (20’)
on 02026-08-25#video on #manufacturing clay #ceramics jar lids to be lapped with carborundum paste so they fit perfectly.
on 02026-08-24#CodysLab #video on #mining magnetite #materials efficiently. First he throws magnetite-bearing dirt with a shovel through a screen into a fan air current to remove gravel and dried grass. Then he lets it trickle out of a hole cut in the bottom of a 20-liter bucket onto a big magnet, which redirects the magnetite to the side into another bucket, while the non-magnetic sand bounces off in the other direction; it takes 8 minutes to process 20 liters. In a day and a half of work he collects 800 “pounds” of 90% thermite.
on 02026-08-24good #electronics #introduction #tutorial #video #formina maybe
on 02026-08-24#CodysLab #video converting urine to 202 grams of potassium nitrate fertilizer #materials, precipitating Ca(NO₃)₂ (having previously replaced some ammonia with CaO) with K₂CO₃. Demonstrates recrystallization in water to separate NaCl. Also uses a paper towel at one point to filter solids out of his nitrate solution.
on 02026-08-24#public TV #video from #ACS-Reactions on extracting citric acid #materials from lemons and by fermenting with Aspergillus niger from a moldy onion, after first starting it in potato dextrose broth, then removing the metal ions from molasses with potassium ferrocyanide, and then feeding the A. niger. "ChemThug" tried using a calcium hydroxide solution to precipitate any oxalate in the mold menstruum, and didn’t find any, although I’m not clear how that would distinguish citric acid from oxalic acid.
So again he adds NaOH to the lemon juice, turning it orange, and then boils the stuff, which turns it brown. Again he precipitates calcium citrate from the slightly basic sodium citrate with calcium chloride (the heating part here is omitted), filtering it through coffee filters (using vacuum filtration) and then oven-drying the precipitate.
For the mold broth he adds calcium hydroxide directly instead of going through the sodium stage, then boils the stuff. Again, to convert calcium citrate to citric acid, he adds sulfuric acid. But his final product wasn’t citric acid, or any acid, because it didn’t make baking soda fizz. So he tried again. Interestingly, he’s using a hand pump for the vacuum filtration.
Then he tries to salt out the citric acid from water solution with acetone.
I wonder if the NileRed video product was actually citric acid after all?
on 02026-08-24#NileRed #video on extracting citric acid #materials from lemons. But, uh, he used lye, sulfuric acid, hydrochloric acid, and calcium chloride to do it. So I’m guessing he’s going to precipitate the citric acid with the calcium citrate, wash it, then acidulate it with the hydrochloric acid? But then you have some unknown hydrochloric and citric acid in solution, plus calcium chloride. You can simpify this to just the acids by precipitating the calcium chloride with the sulfuric acid, but then you have super annoying calcium sulfate, and you still have to separate the hydrochloric acid, which I guess you could just boil off. But then what is the lye for? Let’s see.
Oh, he says he’s not going to actually use the hydochloric acid, so I guess he’s just going to acidulate the calcium citrate with the sulfuric acid, leaving insoluble calcium sulfate and citric and sulfuric acids, but then how do you separate those?
He got 458g of lemon juice (450mℓ) with a pH of 2–3 and then started adding lye to raise the pH to 8–9, which is not at all what I expected; that’s going to give sodium citrate, which is water-soluble, not a calcium-citrate precipitate. He says to fully neutralize an acidic proton, take the pH two points above its pKa, so 8.4 to neutralize the third citric-acid proton (pKa = 6.40); at this point the lemon juice is turning orange. He found that gravity filtration with coffee filters worked better than vacuum filtration because of the lemon pulp, because it’s easier to replace the clogged filters with fresh ones. Then he added the calcium chloride (28.5g dissolved in 70mℓ of distilled water) to the slightly basic solution, which I thought would immediately precipitate calcium citrate, but which needed to be heated to boiling to do so; then it settled, and he vacuum-filtered it and washed it three times with hot water, getting 77g of calcium citrate tetrahydrate. Then he added 20.9mℓ 98% sulfuric acid dissolved in 200mℓ of water; he uses a slight excess of the citrate to ensure that the sulfuric acid is fully consumed, so that the calcium sulfate waste product is contaminated with a bit of calcium citrate, rather than the citric acid desired product being contaminated with a bit of sulfuric acid. He commented that the vacuum filtering process was “kind of slow”, which is a lot less hassle than filtering calcium sulfate usually is. So then he evaporated the water from the 350mℓ of citric acid filtrate at 70°–80° with strong stirring, where I was expecting him to boil it; on reduction to about 70mℓ, he filtered it through a coffee filter to remove a precipitate he thought was calcium citrate that had remained dissolved. On gradual evaporation at room temperature for a couple of weeks, it crystallized; some “viscous brown goop” was left as a supernatant, presumably containing some kind of impurities. Also, he thinks that some of the crystals aren’t citric acid. But he got 18.1g of a theoretical yield of 21.9g.
on 02026-08-24#video on #jugaad #aluminum-air #batteries #toread
on 02026-08-24#Thought-Emporium #video #toread on how to make dragons with science
on 02026-08-24#Integza #video #toread with a variable #rocket nozzle for #flying.
on 02026-08-24#video on #3D-printing pneumatic logic display #mechanisms (incorrectly described as #fluidics) with FDM and silicone membrane to get 8×8 bistable pixels, which he can play Snake on. Each pixel has a single pneumatic vacuum valve (“transistor”) which permits vacuum to the display only when there is vacuum on both the column channel (providing the air current) and the row channel (opening the valve). To get airtight channels with FDM he prints slow, hot, and overextruded, which still wouldn’t give you the wall smoothness you need for fluidics. The multiplexing is rather slow because he’s driving the rather voluminous channels with solenoid-driven valves, getting speeds more like 8Hz than the 10kHz or so normally achieved with fluidics. The platinum-cured 25A silicone membrane’s smooth surface comes from the air-exposed surface of the silicone in a mold carefully leveled with a 2-dimensional bubble level; he tried using a different, commercially-made silicone membrane for the logic surface, but it had to be smooth and flat on both sides, and the commercial silicone sheet wasn’t smooth enough, so he cast his own with glass as the mold on the bottom side. To get the warped bottom surface of the 3-D print to be flat enough to seal well, he sealed it against glass in a vacuum bag and then annealed the assembly at 60° for several hours. Tiny raised concentric rings around the holes that have to make contact with the silicone membrane hopefully make the system more robust against small deviations from flatness. He 3-D prints Luer lock adapters for standard medical tubing, which connect to the logic board with O-rings. I feel like you could probably Charlieplex with this pneumatic-logic approach, and with silicone you might even get a reasonable lifespan, especially with less extreme flexions than the ones he demonstrates in the video. Amusing note: to speed up display updates, he seems to activate multiple rows simultaneously when their contents are identical, an approach which might work for other kinds of multiplexed #displays.
on 02026-08-24#Language-Simp #humor #video reviewing #English, pointing out that it’s not a real language, just a bunch of other languages, since 80% of its vocabulary is loanwords. “All of the useless and irrelevant words like ‘anatomy’ and ‘democracy’ come from Greek, while all of the useful and relevant words like ‘loot’, ‘thug’, ‘bandana’, and ‘mogul’, come from Urdu.” Harshly criticizes phrasal verbs. #formina
on 02026-08-24#Murray-Smith #video about making a position sensor from #hoarding a mouse. #electronics
on 02026-08-24#Dr-Volt #video #toread about #microscopy with a Blu-Ray laser. #hoarding #electronics
on 02026-08-24#Video #toread about “the most powerful laser you’ve never heard of” #clickbait
on 02026-08-24#video #toread of a #lecture by Elm author Evan Czaplicki at Strange Loop 02023 about “The Economics of Programming Languages”
on 02026-08-20#EEVblog #video about jellybean #op-amps #electronics #hardware #toread
on 02026-08-20#Video #toread of #Xiaoma taking a Waorani tribesman to Hong Kong and the Hong Kong Disneyland (HK has a 90-day visa waiver for Ecuadoreans)
on 02026-08-18#Video #toread of #Trybals watching Carl Sagan’s “Pale Blue Dot” video
on 02026-08-18#Video #toread about building dry stone walls
on 02026-08-18#Video #toread about building with "lavacrete", which I guess is crushed scoria and quicklime?
on 02026-08-18#video #toread about #Ukraine Special Operations Center OMEGA’s non-flying #weaponry and logistics #drones in #Ukraine, and OMEGA’s leader Oksana “Oksi” Volodymyrivna.
on 02026-08-18#video by #Harrison-Low on his jugglebot triumph. He finally switched from kevlar kite string to #UHMWPE for the linear actuators. Also he switched to #ODrive Pro electronics to control the motors. Featuring a #JLCPCB #3D-printing ad, sigh. Oh, also he burned out the hand motor because a sensor cable came unplugged. #robotics
on 02026-08-18#news #video of Gandalfs protesting outside Peter #Thiel’s house in Palermo in #Argentina, with more context. It was yesterday. They were protesting that Thiel bought 1% of Vista Energy, the Vaca Muerta oil company. #humor
on 02026-08-18#news #video of Gandalfs protesting outside Peter #Thiel’s house in Palermo in #Argentina #humor
on 02026-08-18#News #video from today (from #MS-NOW, a “Versant Media LLC” brand, which turns out to be MSNBC renamed) about how #Iran left one of the #USA’s destroyers without power for four days, and the carrier #USS-Lincoln has run out of supplies, because Pete Hegseth hid (?!) the fact that Iran destroyed the US’s main resupply base “in the Gulf” (Persian, I suppose?).
on 02026-08-18#Video #toread about backpacking with “the most futuristic” gear
on 02026-08-18#Xyla-Foxlin #video #toread about #dwelling in a #DIY camper
on 02026-08-18#video on sensible-heat thermal #energy storage in a 200-liter drum of sand for heating a greenhouse. The design seems badly botched to me in several different ways: silicone-insulated wires leading into the sand, trying to suck air out of the sand instead of blowing air in, using a plastic sewer pipe to try to get air into the sand, running the heating element off an inverter, using 73 volts dc, no data logging, etc. They never made a followup video in 8 months. #energy-storage
on 02026-08-18#Concept-Crafted-Creations #video about #manufacturing the #solar-energy collector based on the James Webb Space Telescope with 18 mirrors costing US$5 each. Explains that the JWST uses gold so it can do better infrared imaging. He made some small concentrating mirrors by letting heated plexiglas discs sag into a mold made with #3D-printing, which seems like an interesting technique for #optics in its own right, though possibly not imaging optics. Rather than for the final solar concentrator, this was used for a goofy invalid experiment to compare “silver” and “gold” which were represented by colored spray paint, and the “#energy” gathered was measured by some unknown kind of light sensor #electronics. For his big collector, he used not just 3-D printing but also #laser-cutting on wood and assembly with screws. He also used a laser-cut alt-azimuth wood base with a giant gear for #solar tracking. He explains the three-point screw-and-compression-spring mounting that makes each of the 18 mirrors alignable, using TPU accordions for the compression springs; the mirrors themselves are laser-cut plexiglas with reflective window film stuck to it. He was hoping to sag these plexiglas hexagons into a mold in the same way as for the small test mirrors, but his microwave oven (which must be what he used for the others) damaged the window film, so he ended up heating them to only 100° or 120° and clamping them into a mold (with a laser-cut custom clamp) instead of just letting them sag under their own weight. His aluminum collector plate with coolant grooves running through it cost him US$171 for #PCBWay to custom-machine, making this a very expensive solar collector, though he thinks it’s cheap. Also he’s in the Netherlands, where it’s cloudy a lot, especially in winter. Comments mention that blackening copper with liver of sulfur makes a good solar-collector material.
on 02026-08-15#Concept-Crafted-Creations #video about a #solar #energy collector based on the James Webb Space Telescope with 18 mirrors costing US$5 each, each mounted on three springs with screws in a giant flower, with a dual-axis solar tracker. It yielded only 924 watts out of 1.31m².
on 02026-08-15#video #toread about an e-bike trailer for #dwelling that is apparently illegal. 95 minutes
on 02026-08-15#faircompanies #video of 360-acre Ozark homestead #dwelling by military veteran concerned about facing hard times #toread
on 02026-08-15#video of Bach’s Toccata and Fugue in D Minor on an accordion. #music
on 02026-08-15soothing #music #video “Dertli Dolap” by Özgür Baba
on 02026-08-15#video #toread about radio-controlled #drones #flying with circular wings
on 02026-08-15#video short (6') of "Star Trek: The Next Generation" in which a fan from today’s Earth wearing a Rick & Morty shirt is teleported onto the Enterprise, telling Picard and Riker about the 178 episodes. Made with #AI — in some sense obviously, since it’s far too funny and self-aware to be approved by the originals, and it shows the characters as they were in the 80s. It seems to have some concessions in the plotline to limitations of the AI video generator they’re using: “An unofficial fan-made Star Trek: The Next Generation story from The Machine-Made Muse.”
on 02026-08-12#video review of capsule train overnight sleeping berth from Osaka to Tokyo; it’s US$56 (¥79000), the cheapest one. #dwelling
on 02026-08-12Evildea #video evaluating LanguageSimp (Stephen Coughman). Conclusion is that he is in no way whatsoever a fraudulent hyperpolyglot, but rather highly trustworthy and down-to-earth.
on 02026-08-12#humor #video about how #Spanish is hard, longer
on 02026-08-12#humor #video about how #Spanish is hard, similar to the ten stone lions
on 02026-08-12#humor #video about how #Spanish is hard
on 02026-08-12#humor #video about how #Spanish is hard
on 02026-08-12#humor #video about how #Spanish is hard
on 02026-08-12#humor #video #formina about how #Spanish is hard
on 02026-08-12#news #video from four years ago about former prime minister Shinzo Abe’s assassination in #Japan
on 02026-08-12#video on #manufacturing smoky quartz or amethyst #materials from quartz using an electron beam
on 02026-08-12animal #humor #video including an alligator chasing a laser pointer in a swamp
on 02026-08-12#Video by Artem Kositsyn extracting enough energy from a pyroelectric ceramic disc capacitor to light an LED visibly in the dark when the capacitor is heated with a cigarette lighter. #electronics
on 02026-08-12Science #fiction #video made with AI about “The Day the Pillars Fell”.
on 02026-08-11#Video of comedian Desmond Bishop/Bi Hansheng about how he mispronounced his #Chinese name at first
on 02026-08-11#Steve-Mould #video on hand-drawn #holograms #toread
on 02026-08-11#Video #toread on triggering xenon flashbulbs with #electronics
on 02026-08-11#Strandbeest #video with #music by Jos van Hout from a few months ago
on 02026-08-11#Steve-Mould #video #toread on optimizing spinning Euler discs
on 02026-08-11#video on spinning top #mechanisms: it turns out that by spinning an off-center weight inside the top you can get it to keep spinning.
on 02026-08-11Another #Steve-Mould #video about #Gelsight #microscopy, which uses raking light from many angles inside a transparent gel pad to scan the surface topography of small objects in 3-D.
on 02026-08-11#Bigclive #electronics #video on an old sound-detecting dusk switch, which turns on a light when you speak near it, but only after dark. In order to be able to switch AC current with a low trigger current, it uses a unidirectional SCR thyristor across a bridge rectifier, which can be triggered with 200μA. He says it’s old, but the main diode is an A7, the microcontroller looks like a SOT23-6, and everything is SMD. But it probably predates RoHS because it has a CdS photoresistor. There’s a 6.2MΩ SMD resistor involved (“625” label on maybe an 0603) which I don’t think I’ve seen before; at first Clive thinks it’s a collector resistor, used to get a high gain out of a grounded-emitter microphone amplifier, but later he thinks it’s being used to supply almost a microamp to the transistor base to just barely bias it into conduction, which would mean that the collector resistor was just the MCU’s internal GPIO pullup. The power supply for the microcontroller is even simpler than a cap dropper: D -- 100kΩ -- (~Z(5.1V) || 100μF || 0.1μF), with a half-wave rectifying diode and only a 100kΩ resistor to limit the bias current for the 5.1V zener, so the peak current is probably (339V - .7V - 5.1V)/100kΩ ≈ 3mA. Which is a very toasty 1 watt peak on the largish (1206? which is ¼W) series resistor, but that’s only some of the time; the RMS voltage across the resistor is only half of that, which would indeed give a quarter watt.
on 02026-08-11#Video on different ways to use fire in the shop, such as flame cutting steel, bending steel tools, unbending bent-up pieces of steel, expanding frozen nuts, heat-treating steel, welding, fire-finishing wood with a weed burner, starting a fire in the fireplace, lighting a coke forge, etc. Annoying #clickbait title. Reasonable #manufacturing beginner #tutorial.
on 02026-08-11#Video of long-running electrical #mechanisms (EZ-Spin motors, etc.)
on 02026-08-11#video of a stone sphere made from “yooperlite”, a granite (or actually syenite, since it contains almost no quartz) with some spectacular sodalite fluorescent crystals (under 365nm UV) included in it, using automatic rock-sphere grinding #mechanisms. #formina
on 02026-08-1127' #Applied-Science #video about copper atomic layer deposition #manufacturing #toread
on 02026-08-11#Video from last year by #Stealth-camping celebrity #Steve-Wallis in a plywood “fort” designed to blend in under a bridge in Yarmouth, Nova Scotia.
He took some peeling paint from the bridge to a paint store to match the bridge’s paint color, then painted the plywood with a roller in his garage. The plywood was stiffened with other boards. He installed a TV and a self-inflating air mattress. He deploys a Starlink antenna off the side of the bridge for Internet access. Some vertical plywood boards, painted gray to look like the nearby concrete (taking a concrete chip to the paint store for a match), form “ground skirting” around what I’ll call his “access shaft” from the bridge loft down to the ground, where he has also set up a camping chair, since up on top of the painted plywood loft, the roof is too low to sit up. The entrance to the “access shaft” is somewhat hidden behind bushes.
He has a propane heater and some camping propane cylinders to warm the space up (it’s 5°, with -2° expected at night — frost formed), which he warns can stimulate spider egg sacs to hatch and create an explosion of baby spiders. He also has a big fluffy sleeping bag, a coat, and jeans with a warm inside liner.
It’s pretty noisy.
His Lander-brand LED light can be dimmed from his cellphone (Bluetooth?) and is also a power bank. He struggles a bit with lightproofing the seams where the plywood panels meet the ground, one another, and the bottom of the bridge. He hangs some camo netting in the doorway to the “access shaft” to reduce the amount of cold air coming in, which presumably also helps with the light.
He cooks a meal in a skillet on a one-burner propane camping stove from ingredients brought in cans and a ziploc: chicken breast, artichoke hearts, cherry tomatoes, garlic, sauteed in olive oil with pepper and white wine, Campbell’s prediluted broth, parmesan, and finally some fusilli pasta.
Then he engages in nostalgia about his dead “crazy neighbor” Glen.
To remove the “fort”, he and a friend come back the next night wearing high-visibility vests.
on 02026-08-11Amazing #embroidery #video doing kintsugi on a hole. #fiber-arts
on 02026-08-11#Witchcraft-and-Alchemy #video about #bootstrapping thinner aluminum #foil material for a ribbon microphone, noting that the usual stuff is about 10μm, testing with a micrometer, while ribbon-microphone #sensors are ideally 1.5–3μm. He reduces the thickness of household foil by etching the foil with NaOH #materials, 4g dissolved in 200mℓ of water (½ molar, he says), which evidently thins the foil fairly evenly. He glued foil to some plastic roundrects to hold it in place during the process. There’s a point where the foil becomes a very fine mesh, some time before being ripped apart by the hydrogen bubbles after about half an hour. He did a 4-liter test to try to hold temperature more constant. I suspect you could get smoother dissolution with the proper regime of #electrolysis, reducing asperities, but he didn’t try that. For thickness measurement, he did the same repeated-folding-in-half thing that I did, but with a micrometer instead of calipers or a ruler to measure the result. He says some of the foil had “the structural integrity of a wet paper towel,” making the process more difficult. The thinnest acts like gold leaf, sticking to his tweezers. The data shows a linear decline in thickness from 10μm at 5 minutes to 0 at 40 minutes, with a 35-minute sample being 2.2μm thick.
So he made some more samples; he tried to etch them for 32 minutes (before a citric-acid stop bath and water rinse) but they fell apart at 25 minutes.
In order to compensate for unknown temperature and agitation variations, he decided to measure the foil’s resistance during the etch process with a constant current. For #metrology, he amplifies the voltage drop across the foil with a differential-to-single-ended converter based on a LM833 dual op-amp #electronics, with an LM317 set up as a 100mA constant-current source, and a couple of relays set up to reverse the current direction through the foil to eliminate any offset errors, including from any unintended galvanic cells. Also he used an angle grinder to cut some blank PCB into a four-wire Kelvin probe so he’s only measuring the resistance of the foil itself, not the resistance of the copper leading down to the foil. The copper is painted black, presumably to protect it from the NaOH. And he’s using something like a Black Pill to record the data.
The 10μm foil is about 70mΩ (=7mV) at first, decreasing roughly linearly with less than 10nm of noise, enabling thinning the foil down to under a micron before it broke.
If you were doing this electrolytically, you could presumably stop the etch directly from the microcontroller with a transistor or even directly from a GPIO.
Then he repeats the etching with a large sample in the same bath with the thin foil strip whose resistance he’s measuring. And then he corrugates his foil ribbon microphone ribbons before etching them to thin them, which answers a burning question I had, and then he recorded the video with the resulting microphone!
An amusing editing trick is that he recorded himself erasing a whiteboard drawing line by line with his finger, then played the video backwards with a voiceover to make it look like he’s drawing with his finger.
on 02026-08-11declassified #video about LSD-25 and a chemical that blocks its effects. #history
on 02026-08-10#Applied-Science #video using femtosecond lasers and electron #microscopy to slice carbonized insects in the chamber
on 02026-08-10#video #toread on #survivalists using #JS8call for #QRP #radio on HF bands. Mentions that NVIS is difficult to direction-find. Demonstrates his in-attic dipole antenna for the 40-meter band to avoid the specter of the HOA. A lot of talking-head filler but I think under 50%. Later on he has a screencast of using the JS8Call software on 7.078MHz.
on 02026-08-10#Video of building some basic circuits with the Radio Shack 200-in-1 #electronics kit, hacking around a bit with Morse code
on 02026-08-10#Video of Skalar’s squirrel eating a bell pepper. #cute
on 02026-08-10#video of #manufacturing a small PCB transformer for #electronics
on 02026-08-10#video #toread about Gunn diodes #electronics #hardware
on 02026-08-07#video #toread about Esaki diodes #electronics #hardware
on 02026-08-07#video #toread about how magnetrons work. The dude has also made videos about Esaki and Gunn diodes. #electronics #hardware #radio
on 02026-08-07#video by #Bigclive from 02025-07-25 about RF-blocking Faraday-cage anti-5G fabric, made of copper, nickel, and polyester. I think this is the stuff that those kids from Yale were laser-cutting at Noisebridge. #materials
on 02026-08-07#video #interview with Jill Price, who has extremely powerful autobiographical memory, but can’t instantly memorize poems and whatnot.
on 02026-08-05#video of #Japatonic showing his Japanese wife #Argentina for the first time #formina #toread
on 02026-08-05#video on 99 common #Chinese phrases #toread from #Mandarin-Blueprint
on 02026-08-05#humor #video on Japanese product names in English that are unintentionally suggestive
on 02026-08-05#video about fake-video-maker Hank Green quitting YouTube because he got caught using #AI to write his scripts. The video seems to be 100% talking-head filler interspersed with screenshots of text. Except for a brief Simpsons stock quip
on 02026-08-05#video of the BSidesLV #security conference track “Unprompted” yesterday, positioned at Noelle Murata’s talk, which runs from 1:06:12 to 1:35:44
on 02026-08-04#video #humor about bad #Chinese tattoos #toread
on 02026-08-02#video #humor about bad #Japanese tattoos #toread
on 02026-08-02#video #interview #toread with Julieta Venegas about how she used to live in #Argentina for 8 years
on 02026-08-02#video #toread of a #Frondizi #interview about Che Guevara and Cuba. #Argentina #history
on 02026-07-31#video #introduction to the #Hermes agent, which apparently is a more popular alternative to Pi and #OpenClaw #toread
on 02026-07-31depressing #video about the #history of efforts against #malaria, ending by explaining how things are getting worse since #Trump II. Basically an infomercial for Giving What We Can. Not a very high-information-density video, with a lot of talking-head filler and stock footage. #EA
on 02026-07-31#video of testing similar consumer products from 01975 and 02025, more or less, such as drill bits, tape measures, ratchets, Old Spice, and Coca-Cola, Hanes T-shirts, Gillette razors, etc. Generally the new products are higher in quality than similarly-priced old products, but most of the old brands have become much cheaper and also lower in quality.
on 02026-07-27#clickbait #video listing the top 10 least attractive hobbies men can have according to women (for #dating, I suppose, but the source of the poll is unclear): 1. The Manosphere. 2. Gambling. 3. Porn. 4. Arguing online. 5. Funko. 6. Marijuana. 7. Clubbing. 8. Cigars. 9. Crypto. 10. Makeup. And the most attractive: 1. Reading. 2. Foreign languages. 3. Playing instruments. 4. Cooking. 5. Woodworking. Oh, this is from the Date Psychology blog. They didn’t really add any content in the parts of the video I actually saw, just a bunch of talking-head filler.
on 02026-07-27whistleblower John Kiriakou #interview #video about the #CIA and the #politics of the #USA
on 02026-07-27#Smarter-Every-Day #video about making grill scrubbers
on 02026-07-27#Gelbart #lecture #video #toread on “limitations of servo systems, introduction to #sensors, and #LVDT”
on 02026-07-27#Gelbart #lecture #video #toread on “choice of filter, grounding, and sampling”
on 02026-07-27#Gelbart #lecture #video #toread on “tellurometers and inductosyn”
on 02026-07-27#Gelbart #lecture #video #toread on “interfacing, filter selection, and types of wires”
on 02026-07-27#video #history of the #music called “Diggy Diggy Hole” from its origin on the Yogscast in February 02011.
on 02026-07-24#video on “most cursed flyback driver ever” #electronics #toread
on 02026-07-21#humor #video from a year ago about Apple AI summarization of texts
on 02026-07-19#video about zero-views YouTube videos, found by searching for autogenerated filenames like HPIM0021 or DJI0053 or 4834.MP4. #toread
on 02026-07-18#video about how #C-Pop #music has changed in recent decades
on 02026-07-18#news #video about how the world didn’t have a huge #oil shock from the #Iran war just now. Proposes a theory that #China’s Xi Jinping averted disaster.
Incorrectly states that 10% of the world oil supply is “more than a tenth of global #energy usage”. Misleading plots with nonzero baselines to exaggerate drawdowns of strategic petroleum reserves. Purportedly China’s oil imports dropped by half (5.5 million barrels per day) between March and June, though given the previous falsehoods I’m not going to trust anything out of this “Max Fisher” bozo until I verify it. Reportedly there’s a Reuters article from March entitled, “China orders immediate ban on March fuel exports, sources say,” about refinery outputs, and a Wall Street Journal article from June, “China is propping up the world economy by importing a lot less oil”. And reportedly China was burning a record amount of coal by April, perhaps shutting down liquid-fueled power plants. Oh, and supposedly China had a 1.4 billion barrel secret strategic oil reserve, larger than the strategic oil reserves of all other countries put together.
Another boner toward the end of the video: “trading in US dollars means those transactions have to be processed by a US-based bank.” No, no it doesn’t.
on 02026-07-18#humor #video giving an overview of the difficulties of learning Chinese, Japanese, Arabic, Russian, and Korean. But the title is misleading because these aren’t even close to the hardest languages.
on 02026-07-18#video #toread about #Chinese pronunciation #es
on 02026-07-18Frank #Zappa #interview #video
on 02026-07-1601971 #video #interview with Salvador Dalí, who trolls Dick Cavett for quite a while and carries Sarah Bernhardt’s cane
on 02026-07-16#video of #Angra reunion concert #music (3 hours)
on 02026-07-16#video from #Technology-Connections on induction fluorescent #lighting
on 02026-07-16#firestarting #video with “fire rope” to make fire with the friction of rope on wood. A peculiar sort of rope.
on 02026-07-16#video overview by #Johnny-Harris of the recent #history of #Iran going back to before the Great Game. Just talking-head filler, stock footage, and low-information animations.
on 02026-07-16#video on making light with an evacuated (6 millitorr) glass flask with a little mercury in it, which I guess creates triboelectric electrical discharges through the residual gas. With 100 torr of neon it looks amazing with neon orange. Maybe you could do the same thing with another liquid metal if you found one that didn’t wet the glass; copper beads do seem to work somewhat. 40 torr of krypton glows a beautiful blue instead, like an estus flask. Apparently this kind of “mechanical light bulb” was discovered by Jean Picard in 01675. #vacuum
on 02026-07-16#video on #whips made of steel chain that can pulverize pine and cut through fire extinguishers and cheap safes. On one occasion they whipped an aluminum bench so hard that they created a yellow fireball. #mechanisms
on 02026-07-16#video of a diss track in Scots by the Young Abronhill Team gang attacking the Carbrain Young Fleeto gang
on 02026-06-29#video of Mercedes Sosa performing #music with Joan Baez, “Gracias a la Vida”.
on 02026-06-28#video of Astor Piazzolla’s #tango #music “Adios Nonino” performed by the Sofia Levín Quartet, with a mostly reasonable English translation, except usually for the key word “nonino” itself. Tearjerker.
on 02026-06-28#video #toread of Will Sturgeon #lecture on type theory
on 02026-06-23#video #toread about #CH32V003 #microcontrollers. #electronics #hardware
on 02026-06-22#video #lecture 12 part 3 on #mechanisms of #flexures. #toread
on 02026-06-17#video #lecture 8 part 1 on #mechanisms of #flexures. #toread
on 02026-06-17#video #lecture 9 part 2 on #mechanisms of #flexures. #toread
on 02026-06-17#video about #kava/#kratom mixes sold in gas stations in the #USA. Fuck, people are not intellectually or emotionally prepared for this. The YouTuber in question (Evan Edinger) claims to have been addicted to kratom for five years. #drugs
on 02026-06-15#video on Anisha Patel’s #TENS #neurostimulation #electronics #hardware for muscle stimulation. No explanation.
on 02026-06-14#video on the "ElectroHelix" #TENS #neurostimulation #electronics #hardware for play parties from e-stim.co.uk. It uses 2mm pin connectors on the ends for medical sticky-pad electrodes. Their knobs (“level”, “feel”, “speed”) are not calibrated at all. 84000 views! #sex
on 02026-06-14#music #video of Die Antwoord’s “Fatty Boom Boom”
on 02026-06-14#Nighthawk #video about #electrolysis for, e.g., electrowinning metal #materials. First big science error is at 8'08": “Actually everything that dissolves in water splits into ions when it does so.” Nope. He claims to be making #DIY ion-selective membranes using Robert Rowow’s recipe, using off-the-shelf PVC cement and ion-exchange resin beads from water softeners, reinforced with fiberglass cloth, but I’m not clear how he validates them. He recommends using a hot glue gun to hold the membranes in place in his water buckets with EVA. He also turns carbon welding blankets into conductive carbon felt electrodes. He reports 250mA at 1.2 volts from his semipermeable-membrane plastic-bucket Fe⁺⁺/Fe⁺⁺⁺ flow battery with roughly A5-paper-sized carbon-fiber electrodes. Also he makes hydrogen sealed into the cathode compartment of a cell with one of these semipermeable membranes.
on 02026-06-03#CNLohr has new #CH32V006 porn on his channel, featuring its supposedly 1.7Msps ADC in a TDR use case. Apparently its DMA can schedule future I/Os, apparently even to memory-mapped I/O addresses, and you can control the timing of ADC samples to within a single 48MHz CPU clock cycle, although you can’t sample at 48Msps. The ADC is astonishingly clear, especially when he uses an external quartz crystal to get more precise sample times; the code works on the #CH32V003 ADC but has worse precision, but the ’006 has a problem lacking on the ’003 — a discontinuity in the count at multiples of 512 (large DNL?). Oh and apparently UIAPduino SBCs powered by a CH32V006 are available for ¥290 in Tokyo vending machines? Which also sell Raspberry Pi Pico 2s for ¥1060‽ And, holy shit, he can actually very clearly visualize the reflections back and forth from a roll of coax cable with the opposite end open-circuited. He plots it with debug printfs and his "dyngraph" program. #video #microcontrollers #electronics #hardware
on 02026-06-02#EEVblog #video about a #TI NE5532 (but not NE5534) revision that sounds like TI stopped caring about quality. They cut the absolute maximum voltage from ±22V to ±18V and cut the slew rate in half from 9V/μs to 5V/μs, and also entirely dropped the specs for things like crosstalk. Dave also says they’ve changed the frontend topology from npn differential pairs to pnp differential pairs, which seems like it could affect a lot of things like the common-mode range and the sign of the input bias current. It’s probably among TI’s top 20 sold op-amps. It’s like a supply-chain counterfeiting problem, except it was launched by TI against their own customers! Whenever you order TI NE5532s you won’t know if you’re getting the old higher-quality parts or the new parts that may blow up on ±20V rails.
on 02026-06-02#Styropyro #video blowing up all kinds of stuff with 400 car batteries, and running into kink instabilities in solid copper. Longish, a few seconds under two hours.
on 02026-06-02#Viper-7 #soldering #video #toread
on 02026-06-01#Weird-Al Yankovic on a banana-activated synthesizer. #humor #video
on 02026-05-30Bjarne #Stroustrup #interview #video: “I ... probably know most of #C++? But it’s not in the front of my mind most of the time. I look it up when I need, need it.”
on 02026-05-30#humor #video of “God Damn It, Boom Boom. You can’t be inside the house. It’s dangerous.” pet bison (tame but not domestic). Sadly, BoomBoom died the next year. RIP.
on 02026-05-29#EEVblog #electronics #video #toread about bypass capacitors (overview)
on 02026-05-29#EEVblog #electronics #video #toread about bypass capacitors and whether you can remove them
on 02026-05-29#EEVblog #electronics #video from 8 years ago visualizing the effects of bypass capacitors, including 1GHz low-inductance oscilloscope probing and making transmission lines out of copper tape. Some aspects of this video feel like they're from 30 years ago. 5-volt logic, film bypass capacitors, through-hole components. Finally at 17'27" he solders in a 2.2nF 1206 bypass cap, which does a great job. He’s using a 1MHz quartz crystal oscillator (5 divisions per cycle at 200ns per division) with an HCMOS line driver built in; a lot of the ground-bounce action is like 240MHz (4.8 cycles of ringing in 5 divisions at 4ns/div at 11'26", for example.) He gets the high-frequency return paths wrong, though.
on 02026-05-29#EEVblog #video about counting photons from #LEDs
on 02026-05-27#CodysLab #video #casting iron from #thermite made with pop-top can tops in Petrobond in an outdoor desert location. He had to stir the mix with his dedicated thermite shovel to keep it from petering out, severely damaging the shovel.
on 02026-05-26#Technology-Connections #video #toread about dishwasher detergent formulations
on 02026-05-25#video of #azonenberg using #ngscopeclient to decode 100baseT1 #Ethernet and IPv4 packets in real time with the #Thunderscope
on 02026-05-25#video of Len #Shustek explaining #readtape and its #history, for recovering 7-track and 9-track tapes using 16-channel analog data captured by a Saleae logic analyzer. Including Whirlwind tapes at the #CHM. A lecture from 02020. #retrocomputing
on 02026-05-25#video on #speech-synthesis from an 8-pin #CH32V003, driving a speaker through a transistor, using 2-bit ADPCM and the Talkie #LPC speech synthesis library. #electronics #microcontrollers #hardware
on 02026-05-24#video on using LEDs as light sensors with the #CH32V003 opamp for visible-light over-the-air updates for his badge. #electronics #hardware #communications
on 02026-05-24#EEVblog #video on #CH32V003 #microcontrollers, documenting his half-hour to get the thing up and running, in January 02023, when it only cost 10¢. #electronics #hardware
on 02026-05-24#video on #Ukraine #slaughterbots (#weaponry #drones) reaching Moscow en masse and hitting precision targets (including many oil refineries) starting May 17, instead of 90% getting shot down and the rest hitting random crap (not sure if I believe that). Apparently they have better intelligence and they’ve blown up more of Russia’s air defenses. Also operatives inside Russia are launching drones. Profile of Ukrainian Commander Robert “Madyar” Brovdi, whose parents have now survived two Russian assassination attempts within Ukraine, using rocket launchers: reprisals against family members of key military officers are apparently routine in today’s form of war. They’re using “FP1” “Firepoint” winged drones vaguely similar to the Shahed: 1600km, 130 “pound” payload; and the jet-powered RS1 Bars: 800km, 200 “pound” payload. Russia has built a new air defense ring of 40 truss towers at some distance around Moscow.
on 02026-05-23#video about staking a mineral claim to mine gold and silver on public land (BLM land?) under the “General #Mining Act of 1872” by Brent Underwood, that dude who bought a ghost town. He says you cannot build a cabin on it, put up a fence, or stop people from hiking on it. And he says you haven’t been able to patent claims since the 01990s in the #USA, although the law still seems to support it. He paid US$98.09 to file the claim with the Inyo county recorder. Then he spent several 7 months smelting and cupellating his gold and silver, fluxed with borax and soda ash. His doré bar was 71% lead, 4% iron, 1.67% copper, 0.1% zinc, 16% silver, and no detectable amount of gold. So he got like three or four ounces of silver.
on 02026-05-23#video about quicksand, a non-Newtonian shear-thinning fluid.
on 02026-05-23#news #video of #Ukraine soldiers shooting at #drones with a CNN reporter, showing in detail a net-covered road and the tactics the soldiers use to survive while under drone attack
on 02026-05-22#electronics #video #toread about an Uher 4000 Report Monitor repair
on 02026-05-22#I-did-a-thing #video on his #pulsejet powered boat, mostly the struggles of making it.
on 02026-05-22#video of Linux booting on #Flea86’s #VexRiscV #FPGA SBC (now private)
on 02026-05-20#video on difficulties of #manufacturing in “America” (but he’s so provincial he means the #USA). Specifically a knit sweater, made by “our knitting partners”, who blamed the yarn spinners, who furiously blamed the knitters, but were wrong. So he bought yarn from overseas and asked NCSU’s Wilson College of Textiles for help, but still doesn’t know enough to explain in the video what was wrong with the yarn. This was pretty boring but would be interesting if he knew something about #fiber-arts.
on 02026-05-19#video of someone recreating #Gelbart’s bending brake. #manufacturing #toread
on 02026-05-19another #Gelbart #video #toread from the UBC Engineering Physics Project Lab
on 02026-05-17#Hands-on-Katie #video: #electronics workshop in one meter. #toread
on 02026-05-17#Xyla-Foxlin #manufacturing a wooden dress for the Met Gala in 150 hours. #fiber-arts #toread #video
on 02026-05-17another #Gelbart #video #toread, “solving impossible problems for fun and profit”, by “632nm”
on 02026-05-17apparently a 77-minute #Gelbart #lecture #video: “Summary of Sensors, Limits of Accuracy, and Unusual Sensors, by fizzym” about how digital calipers were originally inductive, switched to capacitive (bad in a machine shop, and also using incremental encoders), and some have now switched back to inductive. Also talks about #Tellurometers, and material stability with time (he says steel and regular invar shift by 1 or 2 ppm in a year) and recommending Rolt’s #metrology book Gauges and Fine Measurements. And how laser microphones bounced off windows work. And how the Russians bugged the US embassy. And nonlinear junction detectors for finding bugs, using a second-harmonic narrowband filter to detect parts per billion of nonlinearity in the reflected signal. And how you detect eyes looking at you by scanning the scene around you with a 10mW 830nm laser and looking for retroreflections a million times weaker (10 nanowatts, a “huge signal” in #optics).
on 02026-05-17#video #toread of #Forth, Inc.’s Elizabeth Rather from 01984 on “Computer Chronicles”.
on 02026-05-17#JSK-koubou #video of #jugaad spot welder #electronics using a 555, a bunch of IRLB3034 MOSFETs, some copper cables, and an old car battery (#hoarding). Someone should tell him about transformers, though, and about MOSFET TO-220 tab electrodes. And I don’t agree that burning the wooden backing board at 10ms means that too much heat went into the 200μm nickel strips he’s trying to spot-weld together. He’s still able to peel the "weld" apart with pliers, which to me means that he got inadequate penetration. He has an ingenious and amusing solder-free zip-tie technique to connect the electrodes.
on 02026-05-17#video of #Unitree’s new humanoid robot prototype doing wuxi tricks. #robotics
on 02026-05-17#Steve-Mould #video on Lippmann-plate spectrographically correct color #photography using #iridescence or #structural-color, like the guaninne in the iridophores of a chameleon. #color
on 02026-05-15#video replicating Nadia’s #Dont-Look-Up #security paper with stuff he had in his garage
on 02026-05-15#video channel on YouTube about industrial art
on 02026-05-15#video about the “boss key” in old #videogames, comparing Commander Keen 4-5, Leather Goddesses of Phobos, Bio Menace, Broderbund Star Wars, and Leisure Suit Larry, and the booby-trapped version in Space Quest III: (#retrocomputing or #history)
on 02026-05-15#video channel on YouTube about #hoarding and #DIY/#jugaad
on 02026-05-15#video #toread about rigid three-sided zipper used to pitch a tent
on 02026-05-15#video on #ebikes in Nairobi, #Kenya. #EVs
on 02026-05-15#Blondihacks #video #toread about #machining a tool sharpener (conclusion). #manufacturing
on 02026-05-15#Deutsche-Welle #news #video about how the #USA is “terrified” of #EVs from #China #toread
on 02026-05-14#WildBeare #video #toread of tarp camping in the rain. Quasi #stealth-camping maybe
on 02026-05-14#video #toread on super cheap and cute #EVs in #China #formina (Taiwan version)
on 02026-05-14#Chinese standup comedy #humor #video #toread (with subtitles)
on 02026-05-14#video #toread about #flexures and resonance (maybe watchmaking-related?)
on 02026-05-14#video #toread about "sleep pods" in an airport in #China #todelete
on 02026-05-12#SpaceX #video about #Starship (#BFR) with almost 25 minutes of high-production-value drama #space
on 02026-05-0529-second #video below and above a floating #solar-energy farm in #China. #solar #energy
on 02026-05-05#video #toread by #This-Old-Tony about thread milling on a CNC mill. #manufacturing
on 02026-04-28#video about radio hams in the northwest #UK who couldn’t track down a nuisance radio operator called the “Laughing Policeman” for years
on 02026-04-28#Feynman’s famous #video where he explains that nobody knows how to reduce electromagnetism to something simpler and therefore can’t explain how magnets repel each other.
on 02026-04-28pretty #gross advertising #video of an automatic poultry deboner in operation making mechanically separated chicken
on 02026-04-28#optics #video #toread about a lensless camera with scotch tape by #okooptics
on 02026-04-28#video about Marshall’s ammonium persulfate as a dry oxidant for #flying. #materials
on 02026-04-27#video of recycling aluminum in a home bucket charcoal forge with a fire extinguisher crucible. #manufacturing #hoarding
on 02026-04-27#Asianometry #manufacturing #history #video about numerical control, apparently unaware of cam-operated screw machines and consisting almost entirely of historical photos with a voiceover.
on 02026-04-27#EEVblog #video on using x10 oscilloscope probes containing piezoelectric capacitor #electronics as acoustic vibration sensors
on 02026-04-27#EEVblog #video about partially repairing a mostly-working Hameg 20MHz analog oscilloscope he bought at auction for US$19, largely by spraying contact cleaner into it and replacing a fuse. It has some digital storage capabilities and the service manual online.
on 02026-04-27#video from a North Korean defector about how she learned the meaning of freedom by visiting the #USA
on 02026-04-26#video from #Artisan-Makes about #manufacturing heat-treated steel parts in O1, W1, HSS, or case-hardened steels, focusing on misconceptions people have
on 02026-04-26#homelessness #video for #survivalists about what kinds of cans to use, how to insulate yourself with shopping bags, why Tabasco sauce is important, etc.
on 02026-04-26#video of #DIY #jugaad fish windsock from a flattened HDPE shopping bag by removing ink with alcohol and then tracing a fish pattern onto it from a paper template with a “king size” graffiti Sharpie permanent marker and a green Marks-A-Lot permanent marker. After cutting out the shape with scissors, the author continues adding colors with different permanent markers: the green, and orange, and white. Cutting up a PET bottle and applying some clear packing tape makes a ring almost double the diameter of the original bottle as a mouth for the fish, the bag being connected to it with additional packing tape folded over the edge of the ring. Curled ribbons are taped inside the fish’s tail (its open backend) to catch the wind; a hole punch on each side of the mouth ring enables tying on a string. The final fish is hung rather sadly from a clothesline. I don’t think HDPE will last long in the sun.
on 02026-04-26#video from #Laney-Tech showing #manufacturing process of case hardening 1018 steel from 10 HRC (Rockwell C) with broken-up charcoal briquettes. “After 8 hours at 1700° [Fahrenheit] [930° in real degrees] the carbon should penetrate one sixteenth of an ‘inch’ [1.6mm].” It reaches 60–62 HRC after reheating and quenching, 58–60 HRC after tempering.
on 02026-04-25#video #introduction to #Helix, including the new “gw” feature that lets you jump to any word on the screen by typing two letters, taken from an editor called Amp, also reportedly available in Emacs as “Avi”. He shows off some of the #LSP and #tree-sitter features. They’re working on a #Lisp scripting language called Steel for Helix. #editors
on 02026-04-25pop culture #video about the popular #Chinese #mythology of the afterlife, with Horseface and Oxhead and the ten kings of Hell who judge you for your misdeeds, torture you for tens of thousands of years, and then have Grandma Meng wipe your memory with her soup so you can be reborn. Talking head and AI-generated images.
on 02026-04-25#humor #video from inside #Google: “I just want to serve five terabytes!” With Broccoli Man.
on 02026-04-23#video about how to avoid or defeat #weaponry #drones as an infantryman, from a guy who says he fought in #Ukraine amd Iraq for five years. #toread
on 02026-04-22#Smarter-Every-Day #video about Arabidopsis thaliana explosive seed dispersal.
on 02026-04-22Sabine #Hossenfelder #news #video about the #Dead-Scientists-Mystery, listing the missing and murdered people, but basically just talking-head filler with stock images.
on 02026-04-22#video #interview with #April-Choi about #whips and with her fiancee Bethany Burns
on 02026-04-22#bushcraft #video on making two-ply #rope from dandelion seed stalks after they’ve gone to seed. Dude hung them up to dry in his shed, but they dried too slowly and got moldy. The rope is much more supple than I would have expected from unalloyed dandelions. He doesn't do any real testing.
on 02026-04-22#Shenzhen #CNC #video from #StrangeParts #toread
on 02026-04-22#news #video: in "solar grazing" the beasts keep the grass from growing up over your #solar panels; focused on third-generation shepherd Dan Finnegan in southeastern Massachusetts, whose company is Solar Shepherd, LLC <https://solarshepherd.com/>, grazing that day on a solar farm owned by National Grid. He has 100 “acres” of solar farms under management as pastures. Unlike cows, #sheep fit underneath solar panels on many utility-scale solar farms, and they’re an alternative to “five or eight guys ... running weed whackers under solar panels”. #solar-energy #energy
on 02026-04-22#video about sadhus on #psychedelics (5-MeO-DMT, misleadingly called “DMT” in the video title) one of whom (of the #Aghoris) sort of laughed at it, dismissing it as a “temporary glimpse” though “powerful”, which changed the YouTuber Dakota’s perspective: “There’s a big difference between seeing something profound and becoming something profound.” #religion
on 02026-04-22photoelectric effect demonstration #video #toread
on 02026-04-22#video by Sal Mercogliano from today about #shipping. Three container ships were seized or fired on by #Iran’s #IRGC as they attempted to pass the Strait of Hormuz, so I guess the IRGC still has some ships left, but one of them made it through. And the #USA is also attacking #oil tankers and container ships in the Strait. But Lloyd’s List says at least 26 “Iranian shadow fleet vessels” have evaded the US blockade.
on 02026-04-22#Colbert #news #humor #video #interview with #John-Kerry, mostly about #Iran. #USA #politics
on 02026-04-21#AvE #video disassembling an underpowered Ryobi drill which has a non-cartridge thrust bearing with loose bearing balls. #hardware #mechanisms
on 02026-04-21#news #humor #video with #Colbert saying #Trump is “indefinitely” extending the #USA’s ceasefire with #Iran, perhaps because they aren’t going to show up for today’s negotiations in Islamabad. Shows a photo of serious edema in Trump’s ankle. #politics
on 02026-04-21#video #news saying the FBI is investigating the #Dead-Scientists-Mystery. #paranoia
on 02026-04-21#news #video: grand jury indicts #SPLC, one of the most important #human-rights NGOs in the #USA, on 10 counts of wire and bank fraud and one count of conspiracy to commit money laundering, because they paid informants to infiltrate white-supremacist groups. But Attorney General Todd Blanche, who is prosecuting them, didn’t claim in his press conference that they were cheating people out of money, but, rather, that they were “paying sources to stoke racial hatred”.
on 02026-04-21#video of the memetically viral Flex-Tape commercial from the Flex-Seal company
on 02026-04-21#Mould #video #toread about ultrasonic levitation on a thin film of air trapped between two parallel planes
on 02026-04-20offensive #humor #music #video channel #toread
on 02026-04-20#news #humor #video of #John-Oliver explaining #prediction-markets, specifically #Kalshi and #Polymarket
on 02026-04-20#video on #manufacturing a copy of NurdRage’s tritium-vial-powered power source with two amorphous solar cells from Digi-Key (11-AM-1456CA-DGK-E-ND), a pocket nuclear power plant. He measures the current by charging up an 11μF electrolytic, getting about 2.2V after about 10 minutes, which works out to about 40nA and on the order of 40-50nW. Open-circuit voltage seems to be about 2.8V when it’s cold in the morning.
on 02026-04-20#news #video: apparently the #Dead-Scientists-Mystery has claimed an 11th person
on 02026-04-20new #Segerman #video on morphing #mechanisms: morphing between wireframe cubes and octahedra (or generally any two dual polyhedra) with scissor and geared mechanisms. The geared mechanism uses his extensible racks to lengthen or shorten the edges in sync, driven by the edges’ rotation with respect to 12 immobile gears. Also, a demonstration of some Borromean rings at the Institut Henri Poincaré.
on 02026-04-19#video #toread showing #Ukraine #weaponry #drones flying over the city of Donetsk, very far from the front (50km? Much further than the usual 20km kill zone), where they’re starting to attack Russian military logistics on the roads. Not sure if these are so-called #Martians; those are supposed to be autonomous, and this looks like FPV.
on 02026-04-16#paranoia #video claiming that over the last couple of years someone is assassinating #USA nuclear scientists and “nuclear” “scientists”, as Mossad did with the Iranians. Frank Maiwald at JPL, Carl Grillmair at Caltech (shot), Monica Jacinto Reza at JPL (missing last summer), Anthony Chavez, Nuno Loureiro at MIT (shot), Melissa Casias at LANL (a secretary, missing), Frank McCasland (a general, missing), Michael David Hicks at JPL (died for unknown reasons), Steven Garcia at LANL, and Jason Thomas. Not sure if this is the Chinese Robber Fallacy or not. Then ultra-right-wing streamer Asmongold goes off on a rant about extraterrestrials and UFOs. #Dead-Scientists-Mystery
on 02026-04-15#video on #oil #shipping today by Sal Mercogliano. The #USA normally exports 4 million barrels a day, the Strait of Hormuz normally exports 20 million, and now only 4.5 million are making it across #Saudi, and another 4.5 million are being released from the SPR. The many tankers headed to the US now (60 VLCCs of 2 million barrels each) may not be able to fill up. The USS George W. Bush carrier strike group is going from the US (not the Mediterranean) to the Indian Ocean, not vice versa. And maybe that’s not because of the Houthis.
on 02026-04-15#video #toread about creepy (?) hugs. #toread #dating
on 02026-04-15#Reason #video about what will happen with homemade “ghost” guns. The number of "ghost guns" (without serial numbers) recovered at #California #crime scenes went from 26 in 02015 to 167 in 02016, then doubled every year until 02019 (1623 guns), then leapt to 4671 in 02020 and 12388 in 02021, where it stabilized; the now-defunct Polymer 80 had sold 200k kits in California over the 6 years before the Supreme Court’s 02025 decision in Bondi v. Vanderstok. Outlines #Cody-Wilson and his arrest in Taiwan for paying for sex with a 16-year-old “who’d posed as a legal adult on a hookup app”. #Trump announced plans to ban gun ownership by transgender people. Talks about #Myanmar.
on 02026-04-15#video about #sex glory holes. YKIOK but definitely not my thing. It’s really just an audio #interview over a still image. I didn’t finish “watching” this, too little information density.
on 02026-04-15#video #toread about #BDSM “sub training”. #sex
on 02026-04-15#video of Paul Lagier’s keyfob-sized #e-ink e-reader #hardware called “Pala One”, based on #ESP32.
on 02026-04-15#video about #electrolysis technique "SEM TECH" for refining metals for #mining with salt water. Touts closed-loop no-waste processing and mostly precious metals. #toread
on 02026-04-14Shakira speaking, nominally, seven languages. I didn’t have any trouble understanding her English, Spanish, Portuguese, Catalan, French, or Italian, but I don’t speak Catalan or Italian or much Portuguese, so I think they might have been heavily Spanish-influenced. I couldn’t understand her Arabic at all, of course. #polyglot #video
on 02026-04-14#Hyperspace-Pirate #video on a #jugaad #cooling vest. #toread
on 02026-04-14#Hyperspace-Pirate #video on #manufacturing a #jugaad #cooling setup with phase-change thermal #energy-storage in a bucket of ice with copper-tube heat exchange loops in it, one for a water and ethylene glycol coolant and one for an R600 vapor compression refrigeration loop. #solar #energy #solar-energy
on 02026-04-14#Thought-Emporium #video on #manufacturing hardened iron #materials by case-hardening with charcoal, nitriding with potassium nitrate and chloride, or cementation with charcoal followed by forge-welding it into pattern-welded steel. Attempts at plasma nitriding failed. Unfortunately the video contains a lot of filler stock footage.
on 02026-04-14#tutorial #video on making a toy for wanking (solo #sex)
on 02026-04-14al Jazeera #news about the #Iran war, but mostly just talking heads. Journalist Yara Elmjoui grieves the horror befalling his beloved Tehran in an #interview #video with Malika Bilal.
on 02026-04-13pro-#Ukraine propaganda #video says that al Jazeera says that in March there were 35351 Russian casualties, 96% from #drones #weaponry, a record body count perhaps due to the new so-called #Martians powered by #AI. In 02026 Ukraine projects building 7 million drones.
on 02026-04-13#Tom7 #humor #video about malicious compliance with #TLS #protocols.
on 02026-04-13#interview #video from yesterday with Josefine Lissner of #Leap71 (in Dubai?) who claims credit for revitalizing #aerospike #rockets by building a working model a year ago. I didn’t watch most of the interview because it’s just talking heads.
on 02026-04-13#video on a newish unstable nitrogen allotrope (half-life 36ms at room temperature). #materials
on 02026-04-13#video from Sal Mercogliano on #shipping #news today. He says #Trump’s blockade on #Iran violates #UNCLOS, but UNCLOS isn’t for wartime, and also that it implicates the War Powers Act in #USA.
on 02026-04-13#Iran #AI propaganda #metal music #video with Legos
on 02026-04-13#news #video by Sal Mercogliano about #shipping today in the wake of #Trump’s announced blockade of #Iran. The daily report of the Joint Maritime Information Center (“part of the Combined Maritime Forces under the Fifth Fleet”) says 4 tankers have gone through the Strait of Hormuz in the last 24 hours, 3 on April 11 (perhaps before the Trump blockade). There’s still 800 to 1000 ships in the Persian Gulf. Mercogliano says that right about now is when the tankers from the first of March would have reached Europe, Australia, and America, so this is when the economy starts to feel the #oil shortages outside of Asia; in Asia, the replacement crude from America will arrive at half the flow rate because it takes the finite number of tankers twice as long. Russia and China block the UN Security Council resolution to open the Strait, as Russia’s export revenues surge. The #Saudi Red Sea port of Yanbu can only load 4.5 million barrels per day, even though the pipeline the Saudis just repaired can transfer 7, but even that is much less than the 20 that normally comes through the Persian Gulf.
on 02026-04-12#video of a man-powered #jugaad forklift from scrap #toread
on 02026-04-12#video on #Frankenberg Mark 1 #weaponry against Russian #drones, a baguette-sized model rocket with an explosive warhead. From Estonia’s Frankenburg Technologies, headed by Kusti Salm, at a cost of US$50k a shot, first used by #Ukraine. Seems to be mostly stock photos and stock footage of Vladimir Putin walking around and flags flying outside the UN headquarters. From anti-Russia propaganda channel “The Military Show”.
on 02026-04-12comprehensive #news overview #video of the whole #Iran war and ceasefire so far, including #Trump blockading the strait. #politics
on 02026-04-12talking-head #video on #weaponry #drones. Says #Ukraine front-line military units buy directly from manufacturers on an Amazon-like platform called “Brave One”. “The side that masters drones at scale, in doctrine, in training, and in organization will shape how wars are fought in the coming decades.” #slaughterbots
on 02026-04-12#video of the exploding whale. #Oregon #history #humor
on 02026-04-12#video of pick-and-place #electronics #manufacturing machine depositing solder paste #toread
on 02026-04-12#video on #jugaad 1000fps high-speed camera. Actually the camera is a Sony RX100 Mark 4 which can do that normally. #toread
on 02026-04-11collection of #Iran #video propaganda on a channel belonging to an English doctor who teaches English in a high school in #China. Doesn’t seem to be a China propaganda channel.
on 02026-04-11another #AI Lego #Iran propaganda #video, this time symphonic metal, by "Akhbarenfejari"
on 02026-04-11#news #video: #Iran talks have failed after only one day. It all unraveled while #Trump was at a UFC match. #politics #USA
on 02026-04-11#Uncle-Roger #humor #video on black #ramen vs. Chinese ramen.
on 02026-04-113-hour #Palmer-Luckey #interview #video with Rogan #toread
on 02026-04-11disturbing #metal anti-#Trump #AI #video supporting #Iran, but maybe made by Indonesians. With some #humor.
on 02026-04-11anti-#Trump propaganda AI rap #video from #Iran. #humor
on 02026-04-11#news #video about #drones #weaponry called "LUCAS", a US$35k-per-unit reverse-engineered #Shahed 136 clone developed in 18 months as part of the #USA’s "drone dominance" program.
on 02026-04-11#video about "supercharged" cyclone dust separator #mechanisms #toread
on 02026-04-11#video #toread of "crazy rocketman" with a pulsejet-driven boat
on 02026-04-11Vice #video on black-market mercury? #toread
on 02026-04-11#video of 60 Minutes reporting on #weaponry #drones, duplicate of the other one I watched profiling #Tencor, etc.
on 02026-04-11#manufacturing an improved (?) cyclone separator for removing dust from air with #3D-printing. Reports that the clear PVC he used for his outer air duct is much nicer to work with (with a table saw) than other clear plastics. He has a filter bag following these separators in case they don’t catch everything. 95+% of the dust gets caught by the separators. His filter bag has a clear flexible window sewn into it so you can see it fill up! #video #mechanisms
on 02026-04-11#video #news about demining the Strait of Hormuz by Sal Mercogliano. “Additional [#USA] forces, including underwater #drones, will join the clearance effort in the coming days.” Map overlays showing how #Iran has shifted the shipping lanes into its own territorial waters, and animation of the last 24 hours of #oil ships using Iran’s new #shipping lanes, using AIS data from MarineTraffic. Two US destroyers have arrived at the Strait, and one turned on its AIS (automated identification system) after passing through to show that it had done so.
on 02026-04-11#CodysLab #video on distilling isopropyl alcohol #materials with a countercurrent tube-in-tube heat exchanger built in a 20ℓ bucket on top of a mini-fridge, with a plastic tube on the outside of a copper tube. So he can distill at room temperature (and below) without needing a vacuum. He’s distilled about 250mℓ in a day with airflow driven by an aquarium bubbler.
on 02026-04-09#Primitive-Technology #video about drying roof tiles on the heated ondol floor of the new heated-floor hut. He used his heated-floor chimney to smoke some firewood stacked inside the hut (to get rid of insects?) but then it collapsed in the rain, so he rebuilt it with dry-stacked fired bricks, which was more economical in material as well. He made a new lightweight mold for roof tile curvature from bark whose tree had rotted away, and having laid out some 45 roof tiles on the floor, he heated it back up to dry them out. #bushcraft #bootstrapping #scouting
on 02026-04-09#video #toread on #3D-printing variable-pitch rotors for #flying a large, high-efficiency quadcopter. #manufacturing #drones
on 02026-04-07#video from #Inheritance-Machining of #manufacturing a T-handled tap wrench with a collet that grabs taps of three different sizes and a square drive so you can pull out the T-handle and put a big tap wrench on it for more torque.
on 02026-04-06#video on trying and failing to make #carborundum #materials in the shed in a zirconia crucible; the Australian YouTuber ran into trouble with #export-controls in #China being perhaps incorrectly applied to YSZ. So he used calcia-stabilized zirconia. But an induction furnace is the wrong tool.
on 02026-04-06#video of #Saaniya Abbas on #dating in #Dubai, on Raj Against The Machine. Just talking heads I think. #toread
on 02026-04-05#video of a more elaborate way to climb a coconut tree with more equipment, evidently used by a seasoned coconut harvesting expert.
on 02026-04-05#bushcraft #video of how to climb a coconut tree with a towel, the slow way and the fast way. And then how people climb without any equipment. And then a demonstration of going up and down insanely fast. Also demonstrates scraping coconut flesh out of the shell with an improvised coconut spoon.
on 02026-04-05Kap of the Polynesian Cultural Center demonstrates how to climb a coconut tree with hibiscus bark. #bushcraft #video
on 02026-04-05#video of surviving for 5 days on a desert island (no source of fresh water) without bringing food or water. Unfortunately Madison Clysdale doesn’t know the #bushcraft of how to climb a coconut tree, so she’s struggling with hydration the whole time, drinking out of partly-full PET drinking-water bottles that wash up as flotsam. #survivalists
on 02026-04-05#video #toread about #underground #dwelling #bunkers in #Ukraine
on 02026-04-04full 4-hour #video #interview with #Ethan-Thornton of #Mach-Industries, 3 weeks ago. The interviewer, Shawn Ryan, is this ex Navy SEAL dude who is into some bullshit about supernatural beings building the pyramids.
Thornton doesn’t really understand the Tragedy of the Commons, thinks it’s about companies making insufficient profits because of competition.
Atlas Shrugged is his favorite book.
His childhood summers were fixing old tractors and combines on the West Texas farm of his grandfather farm, who also had a hobby of building and flying experimental aircraft.
He got a visit from the ATF in high school after he started Mach at 16 because he built .50-calibre oxyhydrogen rifle #weaponry and had paid a machinist to build a better one.
“I think the stratosphere is sort of the most important military domain moving forward.”
Also as a teen he stole his mom’s credit card and bought a microscope and two sheep’s brains online to learn about neurosurgery.
He says he’s motivated by “individual sovereignty”, which is why he’s passionate about #Ukraine’s national sovereignty, but “China/Taiwan is orders of magnitude more important”.
“Decentralization” is also why Viper is vertical takeoff: so there’s no runway to bomb.
He envisions making up to 2 million Vipers and having them do everything a fighter jet can do, although right now it’s a kamikaze.
Ryan points out that decentralization means discarding the entire world military infrastructure of bases. Thornton points out that it means you can’t require a tanker to refuel. Containerized anti-ship missiles mean any container ship is a potential destroyer in disguise.
Thornton mentions Anduril’s "Eagle Eye".
At 2h48m Ryan presents him a rifle as a gift.
He says the company would not be in business today if he hadn’t moved from Austin to Huntington Beach, in Orange County, CA, where 95+% of the engineers he needed to hire lived (“niche RF, niche propulsion, niche GNC”).
Both Ryan and Thornton are fairly right-wing, but both agree that the US government has lost a lot of trust internationally and needs to regain it, in particular alluding to Trump and Vance’s shenanigans to increase European defense spending and to #Trump’s unpredictable #tariffs, but don’t see how that trust can be regained. Also interesting to hear Thornton express concern about and opposition to the “terrifying” “neofeudalist” planned obsolescence of iPhones, John Deere tractors, etc., which I normally think of as a left-wing concern.
on 02026-04-04#news #video #interview with MIT dropout #Ethan-Thornton of #Mach-Industries from 7 months ago. He suggests that priority targets for swarms of #drones would be cellphone towers, high-voltage transformers, and cranes in ports, in order to “stop your industrial machine”, war crimes similar to those Trump is threatening in Iran this week. Shows Stratus (balloon-based), Viper, and Glide. Thornton envisions coming out with new models every 6 months or every year, a sharp contrast to the one-week roundtrip touted in Ukraine. He’s also very focused on decentralizing #manufacturing because he expects it to be a target in war. #weaponry
on 02026-04-04#video #interview with on #Ethan-Thornton of "Mach Industries", a 22-year-old making #weaponry called Viper, Dart, and Stratus, and who thinks that balloons will be the key to future air warfare because of their asymmetry: 100× more costly to shoot down than to put up. He’s the one that took Venom (which he calls Pike) from concept to flight in 71 days. He blames the names on the government. He is mostly talking about wars with “hundreds of thousands” of #flying weapons, perhaps unaware that Ukraine and Russia build millions of #drones per year.
on 02026-04-04#news #video #interview of #Palmer-Luckey from two weeks ago. Apparently he’s mass-producing robotic "Ghost Shark" submarines in #Australia now, delivering the first submarine a year ahead of schedule. He describes himself as a “caricature” and a “larger-than-life character”, and says that gets him retweets, which is only helpful for recruiting. Only about half of #Anduril’s products are public, he says, choosing to single out Fury, the autonomous fighter jet. The first Arsenal-1 production lines are going live in a few weeks, so, I guess April, rather than the planned June, and will be making Barracuda, Fury, etc. He expects it to be in full-scale production by Q2 02027. Oh, and he says he has prototype autonomous #subterrenes. #weaponry
on 02026-04-04#news #video from 60 Minutes about how #drones from the #Ukraine war have transformed war, and what that means for #Iran. Says Ukraine now produces 4 million drones a year. Profiles Roman Tkechenko’s #Tencor ground drone company, Air Logix, and its investors, former US Marines William McNulty and Lenore Caraffa, with their investment fund specializing in Ukrainian weapons (“UA1”?). The guy Ukraine has in charge of drones says they have about a one-week feedback time from designing a drone to incorporating feedback from its use in the field into the next generation of drone design. #weaponry
on 02026-04-04#news #video on the rescue of the lost #USA fighter pilot from #Iran today
on 02026-04-04#humor #history #video about medieval inns, taverns, and alehouses
on 02026-04-04#video on "backstugas", #Sweden’s dugout #housing, of which 50,000 were recorded in the 01885 census. Walls typically timber or stone. Overlapping birchbark sheets over planks waterproofed the roof, held down by sod. Dwellers were “backstugasittare”, who owned no land, the poorest of the rural poor. Mostly stock photos with an AI slop voiceover. The Laga Skifte land reform confiscated the village common land they were built on, and industrialization provided employment.
on 02026-04-04sling dart #weaponry #video #toread
on 02026-04-04#shorts #video showing some mechanical #jugaad tricks: screwing a bottle over a padlock to prevent rusting, running a machine screw through a tapped hole in a box-end wrench to make it adjustable (the tip of the screw being the movable wrench jaw), improvising a sort of hole saw or fly cutter for PVC pipes by driving sharp-tipped screws through a metal plate (with a larger pointed screw serving as the center), using a locked tape measure on a nail as an improvised compass, milling a slot into the end of a large machine screw to wind a wire into a spring along the screw thread, welding a bike chain to a steel pipe for a sort of improvised chain whip for turning hex screws, replacing one of the knuckles of a pin barrel hinge with a torsion spring for self-closing doors, and a rather dubious tool for tracing irregular wall contours onto wood.
on 02026-04-04#video #toread showing a “God’s Eye view” of the dropoff in traffic on the Strait of Hormuz from last night, drawing from public data sources.
on 02026-04-04Allen Pan #humor #video #manufacturing goofy nonlethal #weaponry like a “bola gun”.
on 02026-04-04#video by ultra-right-wing streamer #Asmongold showing a video by a viewer of his in Tehran, #Iran, who is suffering disabling vertigo after his neighborhood was bombed, temporarily disabling his leg. He reports power outages after each strike, even though supposedly attacks on electrical infrastructure aren’t supposed to begin for a few more days. Banks have started limiting physical cash withdrawals (a corralito). All rumor.
on 02026-04-03adorable tiny bat #video
on 02026-03-17#humor #video “I glued my balls to my butthole again. Oh my God, what did I do? I can’t take a dump because now my balls are blocking up my butthole. Fool me once, shame on you; fool me twice, shame on glue.”
on 02026-03-15#video #toread of Len Shustek discussing his #readtape #retrocomputing #archival software
on 02026-03-15#video by "Dr. Roger Billings" about the #history of TMS 1802 #microcontrollers that’s 100% talking-head filler and stock photos. #plonk
on 02026-03-15persuasive #video about #energy #futurism (mostly #solar-energy) and #economics, ending up in a fiery anti-#Trump #politics diatribe
on 02026-03-14#video on #manufacturing a cast-iron wrench with lost-PLA casting in waterglass sand with a microwave kiln. It broke when he tried to use it. As usual #Shake-the-Future suffers from a significant amount of talking-head filler.
on 02026-03-14#Veritasium #introduction #video to #asbestos health risks and #history, including Irving Selikoff’s finding in the 01960s that 1.4% of wartime shipyard workers died of #mesothelioma and other asbestos-related #cancer, presented at a conference in 01964, but also covering recent findings about non-quantified risks of natural asbestos exposure.
on 02026-03-12#Mould #video about water hammer toys and a sort of sonoluminescence they produce.
on 02026-03-12#humor #video made with #AI: "Harry Potter by Balenciaga" by #demonflyingfox, a remake of their most popular video from two years ago
on 02026-03-11#video #toread about double-walled glass #manufacturing with teflon paddles and whatnot
on 02026-03-07#video of a minor industrial accident involving belt drive that sent a guy to the ICU for 5 weeks
on 02026-03-06#video #toread about #California #politics over #ebikes (two-wheeled #EVs)
on 02026-02-24#CNBC #news #video #toread about "vanlords" renting RVs to people experiencing “RV homelessness” (aka #vanlife) in #California with RVs in RV parks such as wehope.org’s Berryessa Supportive Parking, whose program manager Victoria Garibaldi says they have 86 RVs.
“As the Bay Area’s housing shortage intensifies[,] vehicle-based homelessness has more than doubled since 2019, forcing even full-time workers into makeshift homes on wheels. This desperation has fueled a predatory shadow market where “vanlords” rent out aging RVs to those with no other options. While cities crack down on street encampments and ban these illegal rentals, San Jose is testing a different path with the Berryessa Safe Parking site, one of California’s largest sanctioned lots with space for 86 RVs. CNBC’s Kate Rogers visits the site to explore how these communities provide a vital bridge to long-term housing.” Says 37% of “homeless people” in Santa Clara County are now sleeping in vehicles, up from 18% in 02019.
Garibaldi says many of the vanlords charge only US$500 to US$600 per month for their RVs, which sounds amazingly cheap for the #SFBA. San Jose enacted a law against renting RVs on city streets last year; last year they opened a second “safe parking site”, bringing the total (?) to 128 RVs; Berryessa Supportive Parking provides breakfast, dinner, bathrooms, laundry facilities, a community garden, and a dog park. Meanwhile, for-profit RV parks like Candlestick RV Park, managed by Tsin Fung, charge US$2500 per month for a parking space.
In SF, Mayor Lurie limited RV parking on public streets to two hours with new legislation last July, with a so-called “Large Vehicle Refuge Permit” exemption permit available.
on 02026-02-2431-minute #video #toread about secret #underground #tunnels in #China
on 02026-02-18#video by #Practical-Engineering on #building #tunnels #underground. Almost entirely talking-head filler and stock footage, though there’s a chart plotting unsupported roof span against “stand up time” at 10'17", with “competent rock” of high rock mass rating being able to stand up without support for a long time, not even rock bolts (anchors), much less more advanced supports. #digging
on 02026-02-18#adorable #video of #kittens and a German Shepherd that does not eat them
on 02026-02-18#video #toread about “homeless people’s” #vanlife in a car: how to cook, sleep, and shower
on 02026-02-16#video #toread from yesterday by "Wandering Jeepsy" (!) about quitting #vanlife after 4 years
on 02026-02-16#video by #lifeoutofmyelement after 8 years of #vanlife giving a tour of her #Honda-Element conversion #toread
on 02026-02-16#video by Rosa (#lifeoutofmyelement) after 8 years of #vanlife claiming that now vanlife is “kind of normal” and has “become normalized and more accepted by society” but describes her relationship with her car as “very attached and kind of codependent”. She recommends iOverlander.com and freecampsites.net for finding places to camp; in the urban areas where she spends a third of her time, she recommends rest areas and Park & Ride lots. She’s driven 214000 “miles” (344000 km in modern units) over the 8 years, 43000 km per year (118 km/day, 1.36 m/s). Now she’s spending US$3000–4000 a year on car maintenance, but gas is more expensive still. I feel like you could probably cut those costs by an order of magnitude by driving less, but maybe not the car insurance (and she also says she has to pay for health insurance, phone bill, food, and gas). She’s on her third iteration of the build of the furnishings using Amazon shelves and whatnot.
on 02026-02-16Bad Bunny’s Super Bowl halftime show that #Trump deprecated. #politics #video #toread
on 02026-02-1636-minute #video #toread on test-driving cheap #EVs from #China that are banned in #USA #politics
on 02026-02-16#video on capacitor #electronics #hardware choice by #MrCarlson’s Lab #toread
on 02026-02-1632-minute #news #video #toread by John Oliver (#humor?) about ICE & DHS
on 02026-02-16half-hour #video #toread from 01959 from Bell Labs about memory #hardware
on 02026-02-16#video of a New Year #robotics show in #China thanks to Sculptor. The robots are child-sized humanoids, performing a martial-arts form including backflips, on stage on a specially prepared smooth floor. They are spaced far apart, and of course the performance is pre-scripted, because martial-arts forms are pre-scripted by definition. They performed with humans who perturbed them somewhat, grabbing staffs they were swinging. Toward the end the robots performed with nunchaku and did a bit of breakdancing and parkour.
on 02026-02-16new #Las-Vegas mole people tunnel life #documentary, guided by a guy who lived down there for years. There are 1500 people there, and they ride bikes. #video #toread #underground #stealth-camping
on 02026-02-15#faircompanies #dwelling #video about an #underground Atlas missile silo. #toread
on 02026-01-16#Argentina #immigration #video by a Russian #toread
on 02026-01-16#video by "ModernHillbilly" about #mining #tunnels #underground. #toread #digging
on 02026-01-16#video about roof reinforcement for #mining #tunnels #underground. #toread
on 02026-01-16Japanese-Argentine #video tour of #Shenzhen, showing delivery by #drones, traffic monitoring by drones, iUFO single-person taxi drones, self-driving ground taxis (since the end of November: L4, no driver, a half-hour trip for US$2.50), self-driving buses, five-axis CNC woodcarving, laser-cutting photographs into leaves, T-shirt printers, etc.
on 02026-01-15#chess #video of Anna #Cramling playing a blitz game and managing to come back from a bad position because her opponent blundered her queen
on 02026-01-15#video of gyroscopic precession #toread #physics #Smarter-Every-Day
on 02026-01-15#livecoding #music #demo #video in #Strudel
on 02026-01-14#video #toread on #bootstrapping aluminum-air #batteries
on 02026-01-14#video on #bootstrapping aluminum-air #batteries with charcoal. Pounds homemade wood charcoal with hammer in a rag, then powders in a blender and adds (non-gelatinized!) cassava starch and water as a binder. Pounds this paste, still lacking any electrolyte, into a cut-off rectangular aluminum profile with a wooden ramstick, producing 7 bricks he sun-dries. Inexplicably he then puts the dried bricks into 7 aluminum profiles, using surgical masks as separators to prevent electrical contact. His current collector for the charcoal is a graphite rod from a carbon-zinc AA battery. Oh, and finally he adds seawater as his electrolyte. Measures 860mV open-circuit initially. Unclear how air is supposed to get to the cathode. Maybe he doesn’t know that’s necessary?
on 02026-01-14#video #toread where #Mr-Electron suggests #DIY #manufacturing of a 20kWh “lifetime battery” which is apparently encased in concrete?
on 02026-01-14#video #toread on #DIY #manufacturing of aluminum-air #batteries
on 02026-01-14#Murray-Smith #video #toread on #DIY #manufacturing of metal-air #batteries
on 02026-01-14another #video #toread about aluminum-foil #batteries by #Thoisoi, who turns out to be Polish or Estonian, not Russian. He uses stainless-steel window screens as the cathode current collector, because it’s an #aluminum-air battery; in one case he adds a layer of graphite conductive spray paint to the screen. Additionally he’s going to use activated carbon for the cathode, sprinkling it on the epoxy-coated graphite-coated fine stainless-steel mesh, then pressing it in a jugaad five-tonne hydraulic press at 100° for 40 minutes, though he says you could just leave it for 12 hours at room temperature. In the end he has eight cathodes, four with a coarser mesh; the dry cathodes measure as only 8Ω or so on a non-autoranging multimeter. He’s making pouch cells with a food-bag hot sealer, which melts sheets of polyethylene (LDPE) together with a hot wire. His anode is 8-layer-thick aluminum foil. As an electrode separator, he uses a wet paper towel, and sandwiches the anode between two cathodes, I suppose to keep air from getting to it. Weirdly, he seals the pouch cell in plastic, so I’m not sure how the air is going to get to the cathodes. One of the cells uses 20mℓ o an electrolyte made from 5g NaCl and 5g NaHCO₃ #materials in 100mℓ of water, giving 0.75V which rapidly declines. On injecting 10mℓ 10% NaOH into the bag with a syringe, it perks up to 1.6V. Short-circuit current is 750mA, but he needs two in series (measuring 2.60V on the multimeters) to dimly light a red LED, suggesting an “internal resistance” of hundreds of ohms. With the NaOH he thinks its shelf life is only a few hours; his batteries were dead in four hours of playing his CD player.
I thought he was going to explain the results he got from different cathode geometries, but he never does. Also he never reports the power output of the battery or explains how the air is supposed to get in.
on 02026-01-14#SIGGRAPH ’24 “thesis fast forward” half-hour #video covering 9 different #graphics dissertations.
Ruben Wiersma talks about applying 2-D neural networks on 3-D meshes in a few different ways, including three that you can pip install: deltaconv pcdiff gravomg.
Chenxi Liu talks about her #algorithms for analyzing vector sketches that artists can use to communicate visual ideas, so far apparently used only for sketch simplification and flood fill.
Rohan Sawhney talks about Monte Carlo geometry processing, specifically to solve PDEs on complex geometry without the volumetric meshing #FEM needs, using “Muller 1956”’s “Walk on Spheres” to interpolate boundary conditions into the interior of a region, using something that sounds similar to an SDF, though he doesn’t call it that; like a “ray tracer” for physics (versus FEM’s “triangle rendering”).
Silvia Sellán talks about faster computation of swept volumes, as well as some other 3-D problems like surface reconstruction; I don’t really understand the common thread between these, though she says it’s “uncertainty quantification”.
Xilong Zhou talks about how to acquire “materials” such as bricks, marble, or ceramic tile, from photos, to use their BRDFs or SVBRDFs in rendering, with some kind of #Bayesian approach.
“Hi, my name is Dr. Zachary Ferguson” talks about a new numerical method for #simulation that don’t experience numerical instability (explosion) when simulated surfaces come into contact and the time step isn’t short enough; it’s called "incremental potential contact", with a new smooth barrier function (with a singularity!) enabling Newton’s method with line search to solve the contact correctly, using continuous collison detection (“CCD”). He claims that his work has “sparked a revolution in physical simulation”, although if that’s true, I don’t know why he feels the need to introduce himself as "Dr. Zachary Ferguson", as if he were used to being ignored and dismissed.
Pascal Guehl [geɪł] talks about texture/material synthesis, what he calls “semi-procedural”, combining the advantages of “by-example” texture synthesis (trying to make things look like a photo) with procedural (adding up noise functions and frequency components). It works by finding the “closest procedural model” to a given example image. Looks really cool.
S. Mazdak “Maz” Abdulnaga talks about volumetric mapping for medical imaging, in particular by minimizing the distortion energy of a volumetric map (ℝ³ → ℝ³) between two target volumes; the energy is defined in a symmetric way, so it doesn’t change when you swap the volumes. For example, you can use this to analyze placental health during pregnancy by mapping 3-D MRI scans taken over time to one another. Other applications include improving texture transfer for surfaces.
Yiwei Hu talks about “efficient material authoring by inverse material modeling”, tackling the same problem as Pascal Guehl in more or less the same way, but using CNN #neural-networks and gradient-based #optimization; his approach seems to handle some cases like checkerboard patterns better than Guehl’s.
on 02026-01-14#Ferrocement tank building #video #toread
on 02026-01-14#solar #energy #sand-battery #energy-storage feeding 250 watts into a stove burner in a flowerpot full of (construction?) sand. #toread #video
on 02026-01-14#Ferrocement #dwelling building #video, part 7, framing the armature #toread
on 02026-01-14#Geopolymers #video featuring Davidovits himself, from “2024 Geopolymer Camp”. He presents a lot of scanning electron #microscopy to support his claims about the chemical structures of geopolymers, but the flexural strength is still very low (apparently a new metakaolin boosts it from 10 MPa to 30 MPa) and I would have liked to see something like NMR spectroscopy or Raman spectroscopy or FT-IR spectroscopy to support his claims that the geopolymer structure is covalent rather than ionic (which he never really comes out and says explicitly). He goes on to try to sell his new book about ancient Bolivian and Easter Island geopolymers.
on 02026-01-13#Tsoding #screencast #video about #Sean-Barrett’s single-file header-only #C libraries like stb_image_write. Mostly remedial C.
#video on making #precision #actuators from cheap stepper #motors instead of US$1 hobby servos to position an array of mirrors to paint light on a wall. Actually he just bought 40¢ stepper-based linear actuators off AliExpress, apparently leftover parts from obsolete cellphones, which turned out to move about 3.2μm per step; he reflow-soldered their flat-flex cables onto custom breakout boards with solder paste and a heat gun. Lacking closed-loop control, he homes the actuators by overdriving them in one direction plus about 200 steps, which stalls the motor but not for long enough to damage it. #hardware #electronics
on 02026-01-13#video #toread by #Coding-Adventure about analyzing #audio with #DSP
on 02026-01-13#video on “can I make a #precision component from scrap metal?” by #not-an-engineer. #hoarding #toread
on 02026-01-13#Ferrocement tunnels #video #toread
on 02026-01-13#Ferrocement #video on “free-forming” a 20-“foot” “bond-beam” for a castle #dwelling. He’s backing his ferrocement with plywood forms while it cures I guess? With just a single layer of expanded sheet metal “lath” to hold the mortar together, with rebar (sometimes “remesh”) to give it more shape. He’s trying to make the bond beam by using one side of an existing wooden/OSB I-beam (pre-consumer architectural salvage) as a form, which he eventually removes once the cement has set. It seems like he’s using plywood/OSB “forms” for one to three days to hold a first coat of mortar together, and then removing them to apply a coat from the opposite side. Also he’s eating green plums off his plum tree.
on 02026-01-13#Bezier curves with de Casteljau’s #algorithms by #Wildberger. #video #toread
on 02026-01-13#fiction #video of Jack Reacher from the series #toread
on 02026-01-13#video about a school bus converted into a mobile #dwelling with a crane and a shop which “may survive the end times” #clickbait #toread
on 02026-01-13#faircompanies #video #toread on a 12m² micro-apartment #dwelling in Paris
on 02026-01-13#faircompanies #video #toread on a 24m² “mini-piso transformable” #dwelling in Barcelona
on 02026-01-13#faircompanies #video #toread on Graham Hill’s “morphing” micro-apartment #dwelling
on 02026-01-13#faircompanies #video on Paul Elkins #dwelling in a US$150 bike camper. It weighs 60 “pounds”, made out of Coroplast recycled from political campaign signs, sort of Airstream-shaped but only as tall as his recumbent bike. Aluminized bubble insulation is duct-taped to the inside to keep it warm in the winter. A frame made of 1" × 2" wood under the floor connects to the wheels. He sewed the Coroplast panels together at the edges with zip ties, then duct-taped over them. He got the (two) wheels from a US$20 garage-sale bike. He has a tiny single-burner propane camp stove and kitchen sink inside; the sink is a bread-loaf pan, with a glass water jug above it for water. He hasn’t really taken it on the road yet, just near where he lives.
on 02026-01-13#faircompanies #video #toread on a #dwelling in the California redwoods that’s been #off-grid for 50 years
on 02026-01-13#faircompanies #video #toread on Kristie Wolfe’s Washington #underground home. #dwelling
on 02026-01-13#faircompanies 10-minute #video on “Lulu’s” shipping container tiny home and cargo trailer bedroom. #dwelling She cut holes for the windows with a “jigsaw”, consuming “a bunch of blades per opening”. She framed the inside with 2×4s and what she says is “denim insulation” under the drywall, plus bubble wrap around the edges to cut down on “a condensation issue”. The tongue-and-groove floor (wide pine boards with tatami on top) is sitting on styrofoam insulation. The ceiling is plywood she wants to replace. Later she added bedrooms outside on a flatbed trailer, in the form of basically a wooden shed. She’s from #Argentina and lived for a year on a boat.
on 02026-01-13#faircompanies #video #toread on Felice Cohen’s 90-square-foot “micro studio” in NYC #dwelling
on 02026-01-13#faircompanies #video #toread on a “Lego-style” apartment #dwelling in Barcelona
on 02026-01-13#faircompanies #video on Zach and Allison Anderson’s “#underground maze of light-filled earth homes” #dwelling, which is mostly not really underground. The above-ground part looks magical, #building with twisted #ferrocement trees for pillars and a central tower, with curved raised-bed gardens on some of the roof. Totally based on ferrocement. Most beds are inside apses behind archways in the walls of bedrooms, sleeping niches with a bed-height floor. Footage is included of spraying the “falseworks” of ½" rebar and slab mesh and expanded metal lath with shotcrete after plastering one side with fiber-enriched plaster. Rainfall from the top is collected through a 3 “inch” pipe into a huge donut-shaped underground cistern (60000 “gallons”). For tax purposes most of the house is categorized as “landscaping” because it’s not climate-controlled. Largely inspired by Forestiere’s underground gardens. The bookshelves on the spiral staircase up to the vault house contain Robert Ludlum, Orson Scott Card, William Gibson, Jo Nesbø, Andy Weir, James Patterson, and Kate Atkinson. His main bed is on a balcony near the top of the tower, “high enough off the ground that there are no mosquitoes”. For outer walls with sandstone-like veins through them, with the appearance of wind-eroded strata, they built custom trowels to plaster it on there, then used an “organic patina acid” to darken some of the strata after it cured. Elsewhere he “pivoted” his ferrocement around an existing oak grove in order to incorporate it into the living space. There are lots of bookshelves that are actually doors. Also there is a chicken coop. His term for the standard superadobe geometry is “lancet dome”, like a lancet arch.
on 02026-01-13#faircompanies #video #toread on a self-built fully #underground #dome #dwelling
on 02026-01-13#faircompanies #video #toread on a Spanish couple’s “hermit homestead” for US$25K #dwelling
on 02026-01-13#faircompanies #video #toread on a military couple’s self-sufficient homestead inside a greenhouse #dwelling
on 02026-01-13#faircompanies #video #toread on Thomas Dambo’s abandoned troll homestead #dwelling
on 02026-01-13#faircompanies #video on a French (?) couple living in an unusual #dwelling in the village of Maina in Greece, which is almost abandoned (two inhabitants); the café closed in the 01950s as most people moved to Athens. They’ve built wooden “bedroom box” housing inside the old stone buildings that can be easily disassembled and moved elsewhere. “It’s between [a piece of] furniture and [a] mobile structure.” A flat roof gathers drinking water; rocks in one corner hold down metal screening to keep leaves out of the water tank, which seems to be a new plastic tank. They converted the old egg-shaped cistern into a (nonportable) house, building a metal structure inside its waterproof plaster to hold the floor, shelves, etc. Condensation has created rust spots on some of the internal metal structure where it wasn’t painted. Inspirational!
on 02026-01-13#faircompanies #video #toread on moving into a backyard cottage #dwelling
on 02026-01-13#faircompanies #video #toread on Nordic prefab homes from a factory ruin #dwelling
on 02026-01-13#faircompanies #video #toread on a solo budget off-grid homestead #dwelling
on 02026-01-13#stealth-camping #video by #Nomad-Sam with his German Shepherd, laden with saddlebags, showing making limpet and sea-lettuce pizza on a not-very-stealthy smoky campfire on I think a rocky beach in Ireland, constantly dulling his knife on rocks. He claims it’s illegal but never explains anything about the law.
on 02026-01-12#video #toread about “10 things I regret about my [#vanlife] conversion”
on 02026-01-12#Stealth-Camping #vanlife #video by #Amber-Baldwin listing 9 “secret” camping spots that only the 121000 people who have seen this video know about:
Hotel parking lots that don’t require a tag on the car (which you can see by checking to see if other cars have tags on them). Apparently hotels in southern California are not yet using automatic license plate recognition, but cheaper hotels don’t bother requiring you to register your vehicle. She says it’s safe but noisy.
Rest areas. (Could this possibly be any more obvious? I’m tempted to stop watching the video at this point.) Washington and Texas are apparently the best states for rest areas in the #USA.
Residential areas, but not super fancy ones where they’ll knock on your RV door, and not right in front of somebody’s house. Sigh. She recommends an app called Overlander to see which ones permit camping.
Marinas.
Boat launches.
Home Despot.
Trailheads.
Highway pullouts.
“Beachs”.
14-minute #demo #video of #SIGGRAPH #paper "StrokeStyles", stroke-based segmentation and stylization of #fonts, starting from the interior and exterior medial axis (#skeletonization) of a glyph outline, producing graffiti, particle systems, and animated glyphs.
on 02026-01-12#video. He says he “evaluates the [#SDF] function once for all points on a [sparse] grid once, and then reuse those cached values when rendering” to get fast enough #performance for fully dynamic #videogames, using bilinear interpolation between the SDF at lattice points to approximate the SDF at intermediate positions. This produces the usual chamfered corner artifacts you see in SDF fonts, as he points out. He uses “brick maps” to reduce storage and, for #LoD, “geometry clipmaps” and the #Jolt-physics engine. However, it seems like he’s having trouble with objects “melting” onto his terrain. #toread #graphics #shaders
on 02026-01-1282-minute #SDF #video which I think ismostly about #sphere-tracing #graphics in #Unreal-Engine for #videogames. #toread
on 02026-01-12#video of paintings of bulls planning a doomed rebellion against the farmers. “Brother, I am troubled. Something is wrong.”
on 02026-01-11#Cesar #video showing that the fake air conditioner for #cooling is a #fraud.
on 02026-01-10#video of a fake air conditioner for #cooling. The author pretends to use a 12-volt air pump connected to transparent push-on PVC tubes as a compressor to condense isobutane! #Fraud. By "The Liberty Engine Project". #Plonk.
on 02026-01-10#Jana-Vanana #vanlife ten essentils #video #toread
on 02026-01-09#vanlife #stealth-camping #video #toread
on 02026-01-09#Xiaomanyc #humor #video speaking in hexadecimal to ChatGPT #AI
on 02026-01-09#video on Euclidean #distance-transform #algorithms #toread
on 02026-01-09#humor #video of #Matt-Rose reading Reddit and Twitter humorous misinterpretations and acting some of them out
on 02026-01-08#Chinese grammar #humor #video “If English had Chinese grammar”
on 02026-01-08#humor #video about how illogical English names for animals and meats are, compared to #Chinese
on 02026-01-08#USA #ICE #politics #news #video file of #Good killing
on 02026-01-08#USA #ICE #news showing #video of immigration agents killing 37-year-old US citizen Renee Nicole #Good with several shots at point-blank range as she was apparently trying to flee a sort of traffic stop. She seems to have hit the agent with her SUV before he started firing, but the government’s claims of “self-defense” don’t hold up given that the SUV accelerated out of control into a parked car as Good died, doing no harm to the agent. #politics
on 02026-01-08#humor #video of a guy calling his best friends to say goodnight. Viral Tiktok “prank” trend.
on 02026-01-07#Numberphile #video of #Cliff-Stoll with a hole in a hole in a hole. #math #topology
on 02026-01-07#video by #Adam-Something about how online #atheism on #YouTube morphed into anti-feminism and anti-progressivism around 02010, which I had no idea about, except for #Thunderf00t, who he does mention. And then the reproductively viable worker ant, and apparently YouTube was a toxic environment for leftist videos, and he became an #Alt-Right viewer, although he implicitly claims he was never a “white nationalist”. Fake video, almost nothing more than a stock photo with a voiceover. #politics
on 02026-01-07#video in which ex-Alt-Right Hungarian #Adam-Something criticizes ultra-right-wing author Matt Forney for making trivial complaints about living in #Hungary
on 02026-01-07#video by ex-alt-right Hungarian "Adam Something" saying that #Andrew-Tate and his ilk are filling a void of “instructions” that insecure young boys are looking for, just that the instructions they get are “stupid and harmful”, so he’s promoting his own 90-page Google doc #dating guide. Somewhat to my surprise, he still recommends asking for phone numbers, which I thought was maybe passé, but the video is from two weeks ago. Unfortunately he sort of falls into the trap of trying to reduce social interactions to defined procedures, hierarchical lists of bullet points. This is still probably an improvement over Andrew Tate advice I guess. #politics
on 02026-01-06#video #interview with Eddie Burback about his “ChatGPT made me delusional” video
on 02026-01-06#video on #LGBT history: “homosexuality in pre-codes #cartoons”
on 02026-01-06#video showing the #history of #English with a constructed monologue over three minutes as the dialect evolves from 00500 Anglo-Saxon to 02000 non-rhotic New York English (as interpreted by an RP speaker). #phonology
on 02026-01-06#vapid #humor #video of #AI yearbooks (mostly from 02023) with kids named things like Aiden, Aiden, Briaden, Bootus, Borts, Borts, Bhuivem, Chunus, Asheligyne, Jorch, Jort, Hunby, Clarser, Shamp, Humers, Hammin, Hobers, Fooly, Furtus, Broop, Hogby, Shimp, Fooby, Foob, Man, Tonsils, Unknown Man, Goray Horef, Herb, Er, Girl, Gandlf, Snaake Licker, The Big Ragu, Zesty McMaster, Chupacara Smith, Job Bobber, Ow Jobber, 3rWezza, Uncle Boxcutter, Harry Butts, Dick Butts, Dick Long, Pingly Purniss, Impotent Hauirr, Britches, Slagrithor, Spub, and Pig. I have no idea why I find this so hilarious; it’s a lot like Sbubby Eef Freef.
on 02026-01-06#medicine #video with #Mikhail-Varshavski that surprisingly isn’t vapid at all, about extreme medical cases he’d seen. Still just talking head and stock footage filler though. This video would have been better as a blog post.
on 02026-01-06#humor #video of comedian Josh Johnson about the #Cardi-B civil assault lawsuit trial.
on 02026-01-06#ChubbyEmu #video full of authoritative minor scientific errors. Almost entirely stock photos and talking-head filler. #Plonk.
on 02026-01-06#medicine #humor #video of being a paramedic
on 02026-01-06#video of a trial lawyer on the #Cardi-B civil assault lawsuit trial. #humor
on 02026-01-06#video by #Practical-Engineering on "pulser pump" water pumping #mechanisms with no moving parts that we believe existed at the Alhambra until the 18th century, recreated by Cáceres in the 20th. The YouTuber here recreated it using acrylic “sheet goods” cut by his friend’s service bureau. He entrains air in the downward flow of water, as in a trompe, and separates the air out of the water at a lower elevation, also as in a trompe. But then he lets the compressed air out of a long riser pipe, and it hasn’t completely separated, so some water is still entrained in it, but less than on its downward trip, so it can raise the water above its initial level. Basically it’s a trompe connected to an #airlift-pump. As with a geyser pump or a #hydraulic-ram pump (also depicted), only a small fraction of the water is pumped upwards. Dean Millar’s paper calls trompes “hydraulic air compressors (HACs)”.
on 02026-01-06new #Segerman #video extending his expanding-racks approach to three-dimensional expanding objects. Lots of #math about three-dimensional symmetry groups and crystal structures.
on 02026-01-06#video by Taylor Jones about the 6-7 meme.
on 02026-01-05#video comparing four #crochet tapestry styles. #fiber-arts
on 02026-01-03another yarn #hoarding #tutorial #video #toread #fiber-arts
on 02026-01-03#Engineering-Knits #video on #3D-printing a circular sock machine (CSM) for automated #knitting. #fiber-arts #toread
on 02026-01-03#Engineering-Knits #video on #gardening your own flax #materials #toread
on 02026-01-03#video by the rather formidable #Engineering-Knits claiming that for US$8 at the thrift store you can find silk sweaters, cashmere sweaters, and wool sweaters to unravel for #fiber-arts. But for some reason the one she’s unraveling is 25% acrylic. Has the very important tip that moth-proofing is a must-do #1 priority; she prefers baking her sweaters in the oven at 75° for 40 minutes, but puts her plastic sweaters in the freezer for three days to kill the moth eggs. Repeats the tip about looking for chain-stitched seams holding together finished knit edges. Runs into alternating rows knit with two different yarns, so the sleeve (for example) becomes two equal-length balls of yarn, but two different yarns. She prefers washing her yarn after unraveling the garments rather than before. She demonstrates her motor-driven unraveling machine, her manual ball winder, and a machine she uses for plying the yarn up into a thicker gauge multi-ply yarn. #hoarding
on 02026-01-03#video on #hoarding thrift-store sweaters for yarn for knitting or #crochet; she recommends looking for finished edges of knitting at the seams, if there are seams, rather than cut edges sewn together with a serger. She washed the garments before unraveling them; this caused her roving-yarn H&M sweater to pill up, which caused it to snag a lot when she was unraveling it onto her yarn winder. She got a pretty staggering amount of yarn actually, 400+ “yards” from the US$5.75 H&M sweater, about 25% of the cost of new yarn, while the Style & Co. sweater gave her 2400 “yards” of very fine yarn for the same Goodwill price, one tenth the cost of new yarn. But she spent 14½ hours buying, seam-ripping, and unraveling. I feel like you could unravel the sweater panels while you were knitting or crocheting something new from them. #fiber-arts
on 02026-01-03#introduction #tutorial #video for tapestry #crochet, making an 18×18 mushroom on a green background. #fiber-arts
on 02026-01-03#Nile-Red on #video about how buying a big separatory funnel got him a call from the RCMP. #human-rights
on 02026-01-03#video about #primitive-technology #bushcraft which claims to be “knitting” a bamboo fan, but it’s actually weaving, from flat bamboo strips. Still #fiber-arts?
on 02026-01-03#video on #The-Line questioning whether it will succeed
on 02026-01-03#Veritasium #video about #power-laws like the "St. Petersburg Paradox" in #statistics, where the expectation of a heavy-tailed distribution diverges. Sometimes “two exponentials are dancing together to make a power law”, moving on to earthquake magnitudes and how the Ising model of ferromagnetism at the Curie temperature is scale-free, and then how a simple model of forest fires produces self-organized criticality. Also, in Per Bak’s sandpile automata. And how VC firms, wildfire insurance, streaming video platforms, and book publishing are governed by power-law distributions. And Albert-László Barabási and Réka Albert’s simulation of power-law link behavior on the internet.
on 02026-01-03#Veritasium #video about how Derek Muller is appearing less in the videos because he wanted to spend more time with his kids and has investors and 30+ employees now
on 02026-01-03#Veritasium #video about #ASML #EUV #photolithography machines, which apparently cost US$400 million each. Explains #optics a bit, including defining NA (as the sine of half the cone included angle) and the Rayleigh equation. Traces the #history through Kinoshita and Andrew Hawryluk, with an #interview with the latter, and extensive interviews with people at ASML. #precision
on 02025-12-31#video #toread with lots of closeup footage of different spiders (and solifugids), including slo-mo. Pretty long on the dramatic narration and short on the science, though. #todelete
on 02025-12-30#true-crime murder #video of Samantha Guthrie in 02018 in Akron
on 02025-12-29#video #news where apparently yesterday the runway at the Aeroparque was damaged by the heat yesterday. Heat waves are expected.
on 02025-12-29#video #humor of Neil Diamond’s chair’s side of the story
on 02025-12-26#video playlist #toread about algorithmic game theory including mechanism design from Roughgarden’s #lecture series at Stanford
on 02025-12-26funniest unexpected fails compilation #video #humor #vapid #toread
on 02025-12-23#EEVblog #video reviewing an Alientek DM40C multimeter with trend chart and a 50MHz oscilloscope and stuff. It looks fucking amazing. #electronics #toread
on 02025-12-21#Franlab #video on using a Leroy lettering set (with #Gorton #fonts) and drafting pens
on 02025-12-21#video on #Hershey-fonts #history from Frank Grießhammer’s presentation nine years ago in 02016
on 02025-12-21#video on copper #materials #safety mistakes accidentally producing N₂O in a runaway reaction. Also changing copper hydroxide’s color from green to blue by dropping the pH, and then converting it to blue vitriol in the obvious way.
on 02025-12-21#video on "Noyron" generative design software for rockets, with footage of some tests. Cool ambigram logo too.
on 02025-12-19#Nighthawk #video on 50%-air to 75%-air aerated #concrete with “kitchen ingredients”; he likes 60% best. Specifically, he stabilizes the foam with pre-hydrated xanthan gum to keep it from collapsing while you’re mixing the cement. Dawn Ultra dish detergent (one part to 16 parts water) is his surfactant. Initially wetting the xanthan gum with “rubbing alcohol” (presumably isopropanol) helps a lot with wetting it; glycerin is apparently unnecessary. He thinks that this works because the xanthan gum slows the cement’s absorption of water.
on 02025-12-19#video on capstan winches. Hmm, if the capstan amplification factor is e^{\mu \varphi}, does that mean you can get super accurate measurements of the coefficient of friction \mu by measuring the force ratio?
on 02025-12-19Maxim #Kachurovskiy on #FreeCAD for #manufacturing after 6 years in Fusion 360. #video #toread
on 02025-12-18Maxim #Kachurovskiy on #manufacturing a concrete lathe for #machining with #3D-printing the molds, part 2. #video #toread
on 02025-12-18Maxim #Kachurovskiy on #manufacturing a concrete lathe for #machining with #3D-printing the molds, part 1. #video #toread
on 02025-12-18#video of #Blow’s trailer for Order of the Sinking Star, which is indeed Sokoban
on 02025-12-18#bigclive #video on antiparallel green LED tape in series with a 1MΩ resistor as a replacement for a regular neon testing screwdriver
on 02025-12-17#video of Lichtenberg figures in “bottle” shapes cut out of acrylic stock on a lathe. Beautiful lightning “in a bottle”.
on 02025-12-17#video on magnetic encoder #precision compared to a stepper motor microstepping; the stepper has about 4° of error.
on 02025-12-17#video on tachometer #mechanisms for #machining
on 02025-12-17#video on #Austin’s moonlight towers. #history
on 02025-12-17#optics #precision #manufacturing #video on making things flat. Like, optically flat: 50nm peak to valley, 1nm RMS. With a “planetary polisher” or “continuous pitch polisher”, which rotates a huge pitch lap underneath a “bruiser plate,” ideally made of something like Zerodur, carrying the blank or blanks. Helpfully explains that the grooves in the pitch lap prevent aquaplaning, just like the grooves in a car tire #tread. In order to avoid having to run his machine continuously, using a many-pole #brushless motor obtained from #hoarding a washing machine, he uses a very high-viscosity pitch (100× more than normal) in a very thin layer, which he initially flattens with a granite plate for 15–20'. His pitch lap is supported on five rollerblade wheels, and he controls motor speed with a VFD. Matching the angular velocity of the lap and the blank results in constant grinding across the surface.
on 02025-12-17worthless #Leonardo #mechanisms #video
on 02025-12-17#Leonardo da Vinci #mechanisms #video including odometer, conical ball bearing, worm-gear-driven odometer, etc.
on 02025-12-17#Great-Scott #video on soft-start #electronics design to eliminate inrush current spikes. He rigs up an impressive alumina-bodied-resistor current shunt of 200mΩ and 50W, which should be good up to 15 amps continuous duty. He finds a 10Ω green disc “ZNR1” NTC thermistor labeled “SCK 103” used in another power supply to solve this problem; it drops from 10Ω down to some 297mΩ when it warms up. But to solve the NTC thermistor cooldown problem he rigs up a relay circuit which shorts out a 3.3Ω series resistor when its IRFZ44N coil MOSFET is triggered by an RC time delay (τ = 50kΩ·10μF = 500ms). That might potentially have the same problem if the inrush-current capacitor’s discharge has a shorter time constant than the delay capacitor, but that seems unlikely.
on 02025-12-17#video on how the #USA sabotaged Viet Cong #weaponry in the #Vietnam war (Project Eldest Son), which was eventually leaked to the press. #history
on 02025-12-17#New-Mind #video on #MEMS #mechanisms. Low information content, mostly just stock footage with an inept voiceover.
on 02025-12-17#video of Riley Kolbow’s #worksbydesign chess pawn #mechanisms that transform into each piece, such as a queen. #3D-printing in stainless or plastic.
on 02025-12-16#humor misheard lyrics in Spanish #video collection, including classics such as “Entonces vino el mago” and “Yo chupo y qué”
on 02025-12-12public-domain #video from 01964 (looks more like 01944, saying “United States of America War Office”, so maybe they got the date wrong) explaining FM #radio #toread
on 02025-12-12#video #toread by Tim Hunkin on the Secret Life of the #Radio. #electronics #communications
on 02025-12-12public-domain #video from 01944 explaining FM #radio with a simple tank-circuit transmitter (Hartley oscillator?) with a capacitive microphone in parallel with the tuning cap. His example is 40MHz with a ±40kHz max deviation (80kHz swing), which he says is the Army’s maximum deviation, plus a 10kHz guard band on each size. But in reality they used “reactance tubes” and phase modulation rather than capacitive mics for their transmitters. He says the key difference for an FM receiver is amplitude limiting (a “limiter”), plus of course FM demodulation itself, with a “discriminator”. The limiter is a vacuum-tube device that might have a transistor analogue. The discriminator is a tank, a diode, and a (bypassed) load resistor, tuned so that the “rest frequency” is at the steepest part of the tank’s Gaussian response, so basically you’re just turning FM back into AM and demodulating the AM. #electronics #history #radio #RF #communications
on 02025-12-12#video from March of tapping molten iron off of #Boston-Metal’s molten oxide electrolysis cell for making #steel. #materials
on 02025-12-12#video on the #history of computing in the #USSR, with the MESM, the BESM, and the ES, but mostly stock photos by "Asianometry".
on 02025-12-11#Argentina in 01951 #history #video
on 02025-12-11100-minute #video on #SAGE #history from a Sun-sponsored #lecture at the #CHM in 01998. Relevant context is the USSR’s first atomic bomb test in 01949. Aircraft kill ratios in the Battle of Britain were 10%, so an effective air defense was unthinkable. At 30'00” Paul Edwards gives the cost as US$4–12B in 01960 dollars. At 30'40” Paul Edwards explains that IBM got paid US$500 million to build the planned 56 computers (28 duplexes). Western Electric film on it starts at 5'11”. 800 programmers (34'00”) which was 20% of the world’s programmers, all working at SDC, which spun off from RAND toward the end of 57, as James Wong explains (55'20”). Maguire went online in June of 01958. Stuart Air Force Base in September. Apparently MIT’s original proposal was to put the whole system underground, but the Pentagon decided that was too expensive. Invited speaker #Les-Earnest (?) says, “This gave rise to this whole industry of ‘L-systems’, so-called: 438L, 465L, all this stuff, that were competing for funds with other things. And for the most part, none of them worked worth a damn. Uh, there were a few exceptions. The satellite control system, I would say, and provided good intelligence, but most of these others, including the Strategic Defense Initiative, were basically boondoggles, and we ain’t through it yet. This stuff is still going on. It gave rise to a multi-billion-dollar industry that basically produces useless junk. And here we are 40 years later.” They tried doing SAGE in JOVIAL, but ended up doing it all in assembly. Mean time between failures of each half of the duplex was maybe days.
on 02025-12-11#video on #SAGE, the Semi-Automated Ground Environment, showing the #displays, which it looks like were circular, about 60 characters tall and 60 characters wide, typically displaying about 100 characters or vectors. #history
on 02025-12-11more #Slocum #mechanisms #lecture #video content from 9 years ago. #toread
on 02025-12-10#video #lecture by Alexander #Slocum on bearings in #mechanisms in a Stars and Stripes do-rag: “In this series of 2.75 videos (named after my MIT class 2.75 Precision Machine Design ) I present the material that is in my on-line free book “FUNdaMENTALs of Design”.
Please also see my website www.ooseh.com where I try to write practical poems to try and help the world be nicer 1/:-( = :-)
(...) As the Pappalardo Professor of Mechanical Engineering, in in late 1990’s I started writing “FUNdaMENTALs of Design” to be a free publicly available design book, and then further developed the material while on sabbatical in 2000 as an Erskine Fellow at the University of Canterbury. (...) Passion, Precision, Pass it on! / Alexander Slocum / Walter M. May and A. Hazel May Professor of Mechanical Engineering / slocum@mit.edu”
on 02025-12-10#Veritasium #video about negative energies in relativistic quantum #physics
on 02025-12-10woodworking #video about sand or salt in glue, cupping panels, battery adaptors, etc. #manufacturing
on 02025-12-10#Cylo #video of diamond-turning a mirror after initial rough milling. #optics #manufacturing #toread
on 02025-12-10#video #toread about a 19th-century linear dividing engine for #machining a ruler.
on 02025-12-09#video by #AmyMakesStuff showing her #stealth-camping #Honda-Element car setup. Not very stealth, really. One really interesting thing is the bed: a wooden frame like for a futon, but instead of having a single giant futon on it, it has multiple separate cushions, which are held in place with velcro. Also she added snaps to the edges of her curtains to hold them in place over the car windows, with the other side of the snap “screwed directly into the plastic trim”. Smart. Her solar panel is suction-cupped to the inside of the moonroof, so it doesn’t protrude outside the car. Also her bed frame sort of slides together to be half the width to use as a couch I think.
on 02025-12-09#video explaining that dipped ceramic disc caps with a black paint hat on the tip are NP0/C0G #precision caps. #electronics #hardware
on 02025-12-09#video listing books on #machining, mostly high #precision stuff, including Precision Hole Location from the Moore Tool Company, as well as their other books; ASME’s Handbook of Industrial Metrology (#metrology); Frank D. Graham’s Audels Machinists and Tool Makers Handy Book [sic sic sic!] from 01941; Franklin D. Jones’s “Old-Fashioned Toolmaking”; Henry Ford Trade School’s Shop Theory from 01934; The Starrett Book for Student Machinists; Goodrich and Stanley’s 01923 Tool and Gage Work; Miller and Russel’s Toolmakers Handy Book; Calvin & Stanley’s Gear Cutting Practice, reprinted by Lindsay Publications; Henriksen’s Jig and Fixture Design Manual; Moore, Davis, & Coplan’s Building Scientific Apparatus; Shigley’s Mechanical Engineering Design (by Budynas and Nisbett); US Steel’s The Making, Shaping, and Treating of Steel; Frank Curtis’s High Frequency Induction Heating; the ASM’s Metallurgy for the Non-Metallurgist, edited by Reardon; Dossett and Boyer’s Practical Heat Treating; the ASM’s Heat Treater’s Guide; and Edward F. Connelly’s Machine Tool Reconditioning.
on 02025-12-09#video on #bootstrapping “#Precision on a Budget” for a US$10 micron-resolution displacement sensor. Specifically he’s using the 8-blade linear-movement flexure Gelbart taught, but made it out of plastic with #3D-printing, with a knife edge in the beam path of an optointerruptor, which he superglued into it once he found the linear region of the optointerruptor. A steel BB on the other end of the linear-motion stage serves as his “stylus” for feeling a shaft or whatever he wants to measure the displacement of. Then he calibrates it with grade-0 (±150nm) gauge blocks from Mitutoyo. He estimates his error at ±5μm over a range of 700μm.
on 02025-12-09#Cylo #video on #precision #flexure #mechanisms, starting with “wobble pins” connected with “pairs of notch hinges”, and cascading two springs of different stiffness, so you apply a large displacement to the weaker spring, which produces a small force in the “colinearly attached” weaker spring, which then moves a four orders of magnitude smaller distance. From Smith and Chetwynd. He proposes the “diving board” flexure, where a force on the end of a cantilevered beam produces a small displacement on the opposite side of its fulcrum, the beam being pinned at its end to form the cantilever support with the fulcrum, the displacement ratio being (16/3)L₂(L₂ + L₁)/L₁², thus asymptotically proportional to the ratio of the squares of the lengths, enabling a large transmission ratio in a small package. His realization uses a cross-leaf flexure for the pin, a bearing ball in a screw for the fulcrum, another bearing ball in a screw to bear on the end, and a wobble bar to a four-bar parallel-movement flexure for the output, which he’s measuring with an LVDT. He even has antibacklash flexures on the threads of his screws.
on 02025-12-09#Cylo #video on books about #machining #precision #mechanisms: Richard Moore’s Holes, Contours, and Surfaces, which is largely about operating jig borers; Douglas Blanding’s Exact Constraint: Machine Design Using Kinematic Principles; CRC Press Basics of Precision Engineering, edited by Leach and Smith; Balasubramaniam, Sarepaka, and Subbiah’s CRC Press Diamond Turn Machining: Theory and Practice; Rowe’s Hydrostatic, Aerostatic, and Hybrid Bearing Design; Kittell’s Precision Mechanics; Evans’s Precision Engineering: An Evolutionary View; Smith and Chetwynd’s Fundamentals of Ultraprecision Mechanism Design; Slocum’s Precision Machine Design; of course Wayne R. Moore’s Foundations of Mechanical Accuracy; and Dave Arneson’s blog post listing “50 tidbits”. Smith and Chetwynd is hard to find.
on 02025-12-09#Veritasium #video on snowflake growth and crystal growth in general
on 02025-12-09#video on #surveillance-pricing and possible #price-fixing by #Instacart and retailers. Good despite the #clickbait title and faked screenshots
on 02025-12-09#video #humor by AI: “Moss Podders (Capsulapoda violae) roam quietly after gentle rains, feeding on moss and fallen petals.” #cannibotanicals
on 02025-12-08#video devlog by ThinMatrix #toread on #dual-grid #tilesets for #videogames
on 02025-12-08#video by Oskar Stalberg #toread on #dual-grid #tilesets for #videogames. For a triangle grid, you only need four little triangle “modules”! (If you can rotate them. He calls his tiles “modules” maybe because they have elevation.) For a square grid it’s 6. He demos a lot of stuff from his game "Townscaper", where the dual grid is entirely made of quads (somewhat skewed) but the primary grid (that the player interacts with) also has the occasional triangle, pentagon, or hexagon (corresponding to degree-3, degree-5, and degree-6 vertices in the primary grid). I wonder what other #tessellations might be interesting?
In another game, he’s doing a thing where he sort of goes back and forth between a triangular grid and a square grid, by cutting his square tiles into triangles in two different ways, and using #WaveFunctionCollapse with restarts to generate a terrain satisfying the implicit constraints of his modules. He’s generating islands from the edge with the constraint that each new module placed must be as high as or higher than the previously placed modules, thus avoiding the kinds of unrealistic local elevation minima that plague Minetest mapgen. This also helps to make the world navigable on foot.
He says he generates the Townscaper quad grid by subdividing a triangle grid, because you can subdivide a quad into four quads and you can subdivide a triangle into three quads, but then later he shows some stuff that sort of contradicts that, where before subdivision some of the triangles were joined up into quads.
Super interesting talk.
on 02025-12-08#video by #jess-hammer on #tilesets in #videogames, covering 15-piece tilesets, 16-piece tilesets, 47-piece tilesets, and a slightly different way to use 15-piece tilesets with a “#dual-grid system”. She shows how her MIT-licensed custom tilemap script implements the dual-grid thing.
on 02025-12-08#video: “A batter that is 2% by weight methylcellulose A4M is squeezed into baths of cold [25°] and hot [95°] water. Though a viscous liquid able to be extruded through the nozzle, the batter rapidly gels with heat resulting in nicely formed noodles in the hot bath.”
on 02025-12-08#Primitive-Technology #video from two years ago with a wood-ash-insulated smelting furnace with a dried-clay tuyere, smelting 34g of iron. 50cm total height, ¼ below ground. Using reciprocating-rotation forge blower powered by pullstring.
on 02025-12-06#Technology-Connections #video promoting Vintaglo and Tru-Tone brands of Christmas lights, as well as Sylvania’s “traditional glow” copycat, and criticizing Menards and Meijer’s attempts.
on 02025-12-06another #video of instant self-heating hot pot using, probably, quicklime #materials
on 02025-12-05#video of instant self-heating hot pot using quicklime #materials
on 02025-12-05#Primitive-Technology #video on #bootstrapping iron smelting from just a natural-draft wood fire: no bellows, no blower, and the only charcoal was mixed into an ore brick.
on 02025-12-05#Primitive-Technology #video on firing #ceramics in a downdraft kiln of George Wright’s “Phoenix” design
on 02025-12-05#Fraser made this hour-long #video about the history of #alchemy including Geber (Jabir ibn Hayyan). #toread
on 02025-12-04#Fraser #video on adding flour water and vinegar to “wild” clay for #ceramics to improve plasticity
on 02025-12-04#Fraser #video on pit-firing #ceramics: 10–25% temper by volume for open-flame firing in under an hour, the temper consisting of mortar-pulverized charcoal. He fans the fire to get the pots up to temperature before letting the fire burn down.
on 02025-12-04#video #toread on three supposedly forbidden items for #survivalists
on 02025-12-04#survivalists #video on how the authorities can requisition electrical generators, etc., in emergencies, so you should hide them. Also firearms (as in Katrina), medications (he suggests buying fish antibiotics) and medical supplies (like insulin, antibiotics, and analgesics), food and water, stored gasoline, propane tanks, battery banks, communication equipment, tools and hardware like chainsaws and water purification systems, and finally, preparedness information. Seems like a stock-footage filler video with an AI-slop script, so I’m not going to finish watching.
on 02025-12-042-hour #video #interview with Stuart Russell on #AI safety. #toread
on 02025-12-04#video comparing fictional starships
on 02025-12-02#video on #Sisyphus and the “illusion of help”, #cartoon #humor
on 02025-12-02#video on how understandable #Chinese characters are to Japanese people who haven’t studied Chinese; they are able to get about half of the words
on 02025-12-02#humor #video on bad translations from #Chinese
on 02025-12-02#video on how to learn #Chinese
on 02025-12-02do #Chinese people also cry when learning Chinese characters? #video #toread #humor
on 02025-12-02more #video on #Chinese pronunciation of those difficult initials #toread
on 02025-12-02#Chinese pronunciation #video of tones #toread
on 02025-12-02#video #toread of Linus Sebastian #interview with Linus Torvalds as he builds him a custom PC
on 02025-11-3041' #video #toread on laser #welding #manufacturing with the xTool, which looks very impressive indeed
on 02025-11-28another #humor #video on how #English makes less sense than #Chinese
on 02025-11-27#introduction #video for #slide-rules, but only using A, B, C, and D scales, no CI, CIF, DI, L, etc. So just showing multiplication, division, squares, and square roots, and not by the most efficient procedure, by Encyclopaedia Britannica Films, filming Harvey E. White, Professor of Physics, University of California
on 02025-11-27very nice #math #video about deriving the derivative of ln x, for example using implicit differentiation in calculus.
on 02025-11-26#Video #toread about a camper trailer towed behind an electric #bicycle.
on 02025-11-25#Styropyro #video #toread about a 30,000-watt incandescent lightbulb
on 02025-11-25#video #documentary on #NIMBY in #Andalusia, #Spain, fighting #solar #energy because the #PV parks are proliferating, and the Spanish state are expropriating the lands of farmers to reach their goals, which is "in their backyard" in a far more literal sense than the usual one. “Renovables sí, pero no así”. Etc. I didn’t finish it.
on 02025-11-25#video on #cooling houses with a natural-convection earth-source PVC tube to save #energy. #HVAC
on 02025-11-25#video on axial-flux PCB #motors. Mostly stock footage.
on 02025-11-25#MIT #OCW #lecture #video on introduction to power #electronics #toread
on 02025-11-25#EEVblog 1718 #video on high-speed probing of #electronics with #oscilloscope probes with a 1kΩ resistor soldered onto a BNC RG-174 cable as your probe tip (a so-called “Z0 probe”), thus putting 1kΩ between your circuit and the cable’s capacitance, with hopefully a much lower parasitic capacitance than a normal o-scope probe, maybe 1pF instead of 13pF. But your DC input impedance is still only 1kΩ rather than 1MΩ or 10MΩ, so you can, for example, load down tri-stated buses much more. And you need a 50Ω termination for your scope cable. But they tolerate longer ground leads than an active FET probe.
on 02025-11-24#Cesar #video on mixing polystyrene #materials softened in gasoline with polyvinyl acetate wood glue in order to get a smoothly spreadable waterproofing coating. Surprisingly, the PVA glue mixes homogeneously with the softened polystyrene. Jorge Donadelli, another biochemist from La Plata, suspects that the PVA is emulsifying the mixture. But the demo of waterproofing doesn’t seem very promising actually.
on 02025-11-22#video on #hydrofoil #drones using capacitive sensing of water levels, with the cathode physically in contact with the water to get a bigger effect (and Kapton tape on the anode instead of solder mask), and using “fringed-field capacitance” (?). His main watercraft body was cut from Foamular, and it used an air propeller in front to drive it. They were using a PID library that by default only updated at 10Hz, which was a problem.
on 02025-11-21#video on the #music-theory of the Pink Panther theme by Henry Mancini
on 02025-11-21#Two-Minute-Papers #video on the #Blender 5.0 release this week. apparently Blender 5’s “Cycles” raytracer supports Nanite-like automatic subdivision
on 02025-11-21#Steve-Mould #video on #supercritical CO₂ #materials
on 02025-11-21#CNC-Kitchen #video on orienting parts for #3D-printing to get better strength; in his initial test his dogbones broke at 63MPa in the in-plane direction but only 31MPa in the cross-plane direction due to lower layer adhesion, a factor of 2 he says is typical. Perhaps unsurprisingly, dogbones printed at 30°, 45°, and 60° from the horizontal were intermediate in strength. Demonstrates “shrink lines” on Benchy and discusses tricks for supports. In his example vacuum-cleaner adapter, he claims that the non-alignment of the layer lines with the stress concentration point from his vacuum cleaner adds additional strength.
on 02025-11-21#video on current #space #news, including a broken window in a Chinese space capsule
on 02025-11-20very nice one-handed QWERTY keyboard #video by HTX Studio. #keyboards
on 02025-11-15#Cesar #video #toread about #hoarding LED lightbulbs
on 02025-11-14#video on non-photorealistic rendering shaders for #videogames, emulating Moebius’s crosshatched style #toread
on 02025-11-14#video on #casting bronze with sand cores made from sand and 5 wt% #waterglass #materials rather than, as in his previous video, molasses and flour. He got his waterglass from a pottery supply store and gas-cured it in a ziploc. He’s using hose clamps on a split pipe for his mold for the core. With 5% he can still break it by hand after curing.
on 02025-11-14#humor #video of #Steven-He “If John Wick Was Asian”
on 02025-11-11#humor #video #toread with #Uncle-Roger in Squid Game
on 02025-11-11#bushcraft #video of making a stone axe from Graig Lwyd (?) flint (?) #toread
on 02025-11-11#Cesar #video on converting a microwave fan into a household fan by soldering it onto a lightbulb base and heatshrinking a PET bottle over it. #DIY #bootstrapping #hoarding
on 02025-11-11#Cesar #video on a microwave kiln using carborundum in bentonite to paint the walls of a hollow in an alumina firebrick #DIY #bootstrapping
on 02025-11-11#video on #DIY refractory glue #materials consisting of waterglass and garden lime, which ought to fire to something like wollastonite. He tests it with a DIY oxyhydrogen torch.
on 02025-11-11#video comparing #DIY refractory firebrick #materials made with vermiculite and perlite, but not giving much detail
on 02025-11-11#video on #DIY refractory firebrick #materials recipes but not giving much specific information
on 02025-11-11#video from #Misadventures-with-materials with a recipe for high-temperature calcium phosphate refractory #materials: triple superphosphate in the coffee grinder, slaked lime, and perlite (run through a food processor), 3.7 parts triple superphosphate (Ca(H₂PO₄)₂) to 1 part lime, mixed as powders, then mixed as equal volumes with the perlite, then pressed dry into a mold, then moistened under pressure, to keep bubbles from expanding from the heat and cracking the material apart. It expands when curing, so it’s better to have a mold you can take the sides off of. #cements #toread
on 02025-11-11more #video about #cements #materials which falls pretty far short of including enough information for reproducibility, talking about “bast” fiber without specifying what plant, confusing caliche with clay, misstatements (“portland has clay in it”, “those [lime and portland bound concretes] need oxygen to cure”), etc. He’s also very confused about #geopolymers. I’m amazed how many factual errors he was able to fit into a single 21-minute video. Where it’s not wrong, it’s super unclear. Also I thought this was going to be about MgO cements, because that’s what it says in the title, but he doesn’t say anything specific about MgO, except that I think he’s confusing it with Al₂O₃. #Plonk to "mrglasecki".
on 02025-11-11#video of scary footage from old MMA/UFC fights
on 02025-11-11#video making Parkhomov-style magnesium #cements with MgO, ZnO, and waterglass to fix a broken firebrick #toread
on 02025-11-11#video investigation of fake #bushcraft channels, exonerating Primitive Technology itself
on 02025-11-11#video #toread by #Murray-Smith on magnesium-oxide #cements, specifically Sorel oxychloride cement #materials
on 02025-11-11#video on building a shower with a magnesium-phosphate drain, using magnesium oxide, Mega Buds potassium phosphate fertilizer, and borax, used to stiffen burlap. #cements #materials
on 02025-11-1135' #video on magnesium phosphate #cements #materials for airfield pavements for enhanced corrosion resistance and heat resistance by a guy whose product has been in service at Cannon Air Force Base for three years now. Apparently leaked lubricants were somehow forming phosphoric acid in the jet wash, which ate the concrete. Magnesium-phosphate pothole fillers were immune. Magnesium oxide (light, hard, or dead burned), ammonium or potassium phosphate salts, fly ash (40–60%) and boric acid to retard the reaction (though boric acid degrades the strength, by about 25% at 3% boric acid), and water. The set cement is struvite-K (MgKPO₄). He mentions that any unreacted phosphates are highly soluble, making porous concrete after they leach out. See ERDC Technical Report 20-12 from 02020 by Ramsey, Scott, Weiss, and Tingle. #toread
on 02025-11-11#video on #electronics #hardware for solid-state relays, such as the MOC3020–MOC3023 100mA triac-output optocoupler chips. #toread
on 02025-11-11#video on sharpening knives on the bottoms of pottery and stuff. #toread #bootstrapping #DIY
on 02025-11-11#Sanladerer #video on why #3D-printing still uses stepper #motors #toread
on 02025-11-11#GreatScott #video on controlling #motors with encoders
on 02025-11-11#Thisismax #video on sensorless #FOC #control of #hardware #motors, using the most hilarious Nerf launcher I’ve ever seen, using three Kv = 2200 drone motors (minimum 10krpm) as rollers to launch the balls in a curved trajectory by controlling their spin. He wanted to use STMicroelectronics’s “#STM32 MC Motor Profiler”, but that would have required using Microsoft Windows, so he used the Arduino #SimpleFOC library instead. He gets motor position feedback from the back EMF of the motor windings (I’m not sure if this is inherent to “FOC”). He says most small drone motors are Y-topology. #electronics
on 02025-11-11some kind of Gary Bernhardt talk #video
on 02025-11-11#video on corporate language #humor
on 02025-11-11#video on #flying a hybrid between an #ekranoplan and a #hydroplane. #toread
on 02025-11-11#Steve-Mould #video on a new kind of bone drill #hardware that avoids cutting skin and can literally cut the shell off a raw egg while leaving the membrane underneath intact.
on 02025-11-10#electronics #hardware #video putting a disc ceramic capacitor across a junction diode to reduce problems with reverse recovery time, specifically 60-cycle power supply noise in your audio amplifier
on 02025-11-10#video about #Argentina where a sock vendor tries to steal the Dutch Moldovan guy’s camera
on 02025-11-08The #Commodore 64 SID #hardware’s sawtooth wave #signals weren’t very linear, more like an RC decay. #retrocomputing #video
on 02025-11-08#humor #news #video of #Colbert announcing #Mamdani’s election and a bunch of other #USA #politics
on 02025-11-06supposedly #DeepSeek v3.1 beats Claude Opus 4 on some coding benchmark or other and is “open-source”. “671B parameters (37B active per token).” Lots of stock footage in the #video. Optimized for "UE8M0 FP8", which I guess is an 8-bit floating-point format supported by domestic (SMIC?) GPUs like the recently-released Xi Yun C600 and a speculated-to-be-near-future Huawei chip. Apparently GPT-4 slightly beats it on coding benchmarks. #AI #news. Video is 2 hours 42 minutes. #toread
on 02025-11-06#video of asking 100 people their biggest regret, ages 1-100
on 02025-11-05#video of grinding a 3.1° primary bevel knife blade and then a tiny 20° secondary "microbevel" tens of microns wide, producing truly astonishing sharpness. Still just on steel though. It gets ruined when he hits a staple.
on 02025-11-05#video on contraptions from Jan Adkins’s book “Moving Heavy Things”, with series of stakes stuck into the ground and wired together and whatnot, so-called “deadman” things. He uses a hand ratchet thing with a chain to pull bulldozers and farm tractors by hand.
on 02025-11-05#video on immersed-tube #construction of tunnels like the Fort McHenry tunnel in Baltimore and the #BART Transbay Tube in the #SFBA.
on 02025-11-05#humor #video about Chen Rui, #China’s #Trump from Chongqing
on 02025-11-05#video on comedian #Uncle-Roger who has been canceled (twice!) by #China, in January 02021 on Weibo and Bilibili for collaborating with Mike Chen because he was “anti-CCP” and also #Falun-Gong, but apologizing for that got him canceled on Twitter, and then two years later (02023?) he got canceled again for making a joke in Boston about how he had to say China was a very good country because they were listening through Huawei phones, so his social credit score would go up, and then joked that Taiwan was not a real country. This resulted in all four of his Chinese social media accounts getting banned. Also he got cancelled on Twitter for making a joke when Russia invaded #Ukraine, and in Singapore when he “talked shit” about the food. This is a “podcast for the canceled” called "triggernometry".
on 02025-11-05#video on #Argentina: what happens to stablecoin #cryptocurrency adoption when hyperinflation goes away? Ends up surveying major cryptocurrency use cases in Argentina: tax evasion, cross-border payments, wealth preservation (3’49”), earning yield (13’57”), and everyday spending (14’36”). He interviewed a cuevero who says that actually the cuevas have more business than before #Milei. A thing I didn’t realize was that Macri’s blanqueo was abrogated by Fernández: “Cuando cambió el gobierno al Kirchnerismo, toda la gente que blanqueó tuvo que pagar alrededor de un 40% sobre todos los [activos?] blanqueados.” That’s a theft of about US$60 billion by Fernández. Lots of interview footage with #Belo founder Manuel Beudroit? Boudreau?
on 02025-11-05#video by "UC Military News" about what #drones did for #Ukraine in October #toread
on 02025-11-05#humor #video with #Uncle-Roger meeting the #cooking fried rice woman
on 02025-11-04#video #interview with comedian who plays #Uncle-Roger
on 02025-11-04hilarious #humor #video about #Uncle-Roger being disgusted by an egg fried rice #cooking video
on 02025-11-04#video on new airships (HAPS, high-altitude stratospheric platformes, from Sceye, the Lockheed Martin P-791, which spun off as AT², etc.)
on 02025-11-04#video on visiting #Argentina for the first time by a Dutch Moldovan who speaks Latin American Spanish because he lives in Colombia. #toread
on 02025-11-04#video of #drones killing Russians in pro-#Ukraine propaganda #toread
on 02025-11-04#video with technical detail about fast #drones, Peragreen 3, with a 16kW lithium-ion battery. #toread
on 02025-11-04#video where "Anastasi in tech" touts ternary computers like SETUN as a “huge breakthrough” that failed because transistors and vacuum tubes were binary, citing a new Huawei patent and the potential of carbon nanotube semiconductors. #plonk
on 02025-11-04Russia is testing a nuclear ramjet cruise missile. Mostly stock #video
on 02025-11-04#video on #Ukraine’s HUR spy agency attacking Pokrovsk today with troops that hopped out of a troop transport helicopter just above the ground, denying FPV drone operators line-of-sight as well as denying SAMs radar lock. But the video is just a bunch of stock photos, in fact the same stock photos over and over again. #Plonk to “J&J’s military report”.
on 02025-11-04#video #tutorial on splicing barbed wire with a hammer and some wire cutters
on 02025-11-04slow-motion #video of #weaponry accident causing third-degree burns, analyzing the equipment failure
on 02025-11-0335' #video on #manufacturing terrifyingly realistic sex dolls, eyelash by eyelash, at Dongguan Qianyou Silicone Technology Co., Ltd.
on 02025-11-03#video on #fractals generated by letting the Mandelbrot exponent in z² + c vary from 2 to arbitrary complex numbers
on 02025-11-03pro-#Ukraine propaganda #video from yesterday about mostly tank battles with a bit of #drones and artillery #weaponry. Every Ukrainian tank round fired hits its target, usually completely destroying it, a Bradley IFV destroys a Russian tank, etc.
on 02025-11-03#video on #weaponry for #Ukraine, NAD of Sweden’s US$5000 warhead-less infrared-guided missile "Kreuger" 100, because Lockheed Martin makes 500 US$3.7M Patriot PAC-3 missiles per year, while Russia makes Geran “flying lawnmower” #drones for US$30k to US$100k and sends 100–500 per night. Russia’s Orlan-10 is US$87k to US$120k. The Kreuger 100XR is longer-range and does carry a warhead. It’s propeller-driven, but with just one electric propeller at the rear, plus forward and rear canards. “Civilian configurations” (?) reach 270km/hour but only 4000m altitude.
on 02025-11-03#video of flying around on a "Volonaut" jet hoverbike, probably not AI. “The Volonaut Airbike flying motorbike is a breakthrough in personal air mobility. This futuristic vehicle is a realization of a bold concept often portrayed in science fiction movies - an inspiration that with time became the obsession of its creator, entrepreneur and inventor Tomasz Patan. This “superbike for the skies” is powered by jet propulsion and is designed to carry one person with speeds up to 200km/h or 124mph.”
on 02025-11-0335' #video of talking-head filler intercut with stock footage on the difficulties with the #Samsung 2nm fab being built in Taylor, #Texas, #USA. One interesting piece of stock footage shows huge #TSMC parking lots shaded with solar panels.
on 02025-11-03#video on new axial-flux high-power-density #motors #toread
on 02025-11-03#video of #livecoding deep acid house #music in #Strudel, which seems to have very interesting #UX. #toread
on 02025-10-31#video from #Mother-Jones of the leaked group chat text on #China #soybeans: “Finally - just a heads up. I’m getting more intel, but this is highly unfortunate.
We bailed out Argentina yesterday (Bessent) and in return, the Argentine’s [sic] removed their export tariffs on grains [sic], reducing their price, and sold a bunch of soybeans to China, at a time when we would normally be selling to China. Soy prices dropping further because of it. This gives China more leverage on us.” #Trump #USA #politics
on 02025-10-29#video #toread on "Selectramatronics", using a Selectric-like mechanism for mouth expressions on face #automata made by #3D-printing
on 02025-10-29#video on a variant of #surface-stable fractal #dithering #algorithms
on 02025-10-29another #surface-stable fractal #dithering #video, amazing
on 02025-10-29#video about #surface-stable fractal #dithering in which dots stick to 3-D surfaces but remain approximately the same size and spacing across the screen, by Rune Skovbo Johansen
on 02025-10-29“Suck my hole like a Tootsie Roll” #AI #humor #video from “Banned Vinyl Collection”
on 02025-10-29#video about another record in quadcopter #drones from a week ago, 585km/hour, using 15–16kW of electrical power at peak. He’s using a box of water with two aluminum-plate sides as the heatsink for the ESCs, just holding the heat thermally in the water until the end of the flight. He endorses SMC batteries.
on 02025-10-29#video #interview with retired Lieutenant General Marc H. Sasseville, who was going to try to ram Flight 93 on #September-11 with his fighter jet, and smelled the Pentagon burning when he flew over it. But evidently it had already crashed.
on 02025-10-2820-million-frame-per-second Shimadzu HPV-X3 high-speed slow-motion #video of macroscopic impacts
on 02025-10-28#vanlife #video about a Mercedes Sprinter with a 170-inch wheelbase converted into a camper van for offgrid FPS gaming. He’s installed “bump-outs”, bulging the van walls outwards, to make the bed area a little wider. A three-step stairway for his dog leads up to the bed, designed with storage inside it. His air conditioner bulges out of the top. He’s using a pretty standard setup: diesel space heater inside, a “garage” for storage under the bed accessed through the back door (with some mechanicals: electrical, with a 48V side and a 12V side all running on 12V lithium-ion batteries, and plumbing, with a 35-“gallon” freshwater tank and an electric hot water heater), a portable 10-“pound” propane tank for the stove, a Dometic dorm-sized fridge under the bed, 1000W in five rooftop solar panels. The 48V battery bank is 270Ah, so probably about US$1000,
on 02025-10-2642" #video of aluminum plant fire due to a hydraulic leak in what looks like an extrusion press spraying flammable hydraulic fluid all over the ceiling
on 02025-10-24#video on #videogames #floating-point bugs in timing #toread
on 02025-10-22#video where #Wandel, who was there, disagrees with a BlackBerry movie. #toread
on 02025-10-22#video #toread on dysprosium #materials
on 02025-10-21#Terry-Davis #TempleOS SparrowOS internals #video #osdev #screencast
on 02025-10-21#video on #raylib’s new software renderer for the subset of #OpenGL 1.1 that rlgl uses, so it can work without a GPU now
on 02025-10-21#video on #Billy-Joel’s #USSR concert history
on 02025-10-21#lab #tutorial #video on iodometric titration by #Waikato #toread
on 02025-10-21#lab #tutorial #video on #vacuum filtration by #Waikato #toread
on 02025-10-21#woodworking #video by #Wandel about #manufacturing woodworking tapered blind mortise-and-tenon joints #toread
on 02025-10-21#video by Business Insider doesn’t explain what binder and coating the Netherlands company Fruitleather adds to their mango filler to make “vegan leather” #clickbait
on 02025-10-21#NurdRage #video on a US$10 metal aspirator #vacuum pump for the homelab, for example for vacuum distillation boiling water at 39° or even 19°, as an alternative to cheap US$6 nylon diaphragm pumps. He powers his aspirator from a US$20 60W 100psi 12V diaphragm water pump recirculating in a polyethylene tub. He points out that this has the advantage that it “scrubs” the gas extracted by mixing it very well with the water.
on 02025-10-21#video on #bootstrapping a #DIY #vacuum chamber by reversing a bicycle pump piston and making a #jugaad check valve by dropping a BB into a Schrader car tire valve with the valve core taken out. Gravity I guess keeps the BB from falling out of the valve, because it faces up.
on 02025-10-21#DIY #vacuum tube #video for #bootstrapping #electronics #toread
on 02025-10-21#DIY #vacuum #video with a thick sheet of polycarbonate on top of a pressure-cooker pot with a silicone cooking mat as a gasket, tapping the hole in the polycarbonate using vise-grips as the tap wrench, drilled and tapped to match whatever your vacuum gauge hose fittings want. An O-ring compressed between a flange on the hose fitting and the polycarbonate surface by the tightening thread on the hose fitting provides the seal to the hose fitting. Doesn’t even damage the pressure cooker. But it’s not very DIY in the sense that he’s using a refrigeration vacuum pump to make it work, which is a bit like building an entire automobile starting with just some scrap metal, hand tools, and a Volkswagen Beetle. #manufacturing #bootstrapping
on 02025-10-21#NFTI #video #toread about #manufacturing camping teardrop foamie trailers out of XPS #foam #materials
on 02025-10-21#Blow #video from streaming on #Twitch six days ago of “late night bugfixation”.
on 02025-10-21#video #toread of “10¢” #electronics #hardware for making #music with #CH32V003 #microcontrollers
on 02025-10-21Maxim #Kachurovskiy’s #video of #manufacturing a concrete lathe "NanoEls" with #3D-printing for #machining. Except that he also bought some machined aluminum parts from #JLCPCB CNC. Includes open-source (?) G-code control thing that consumes STL files. He regrets not leaving two channels in the base to post-tension the concrete with M12 threaded rod and not vibrating the concrete enough to get the bubbles out.
on 02025-10-21#Hyperspace-Pirate #video on #bootstrapping/#manufacturing a #DIY #jugaad CT-scan #tomography #radiography machine (using a donated dental #X-ray machine and an “intensifier screen”) and #3D-printing the results. He triggers his phone’s camera app with a spring-loaded pin controlled by an Arduino-triggered relay. Lowest power setting is 60kV, 4mA. He hacks the images with the GIMP to get reasonable grayscale, then feeds them into the open-source “3D Slicer” to try to do computed tomography, but it didn’t actually do tomography, just meshing once you’ve already done the tomography, so he used a “cone-beam backprojection tool by Stanislav Maslan” for that. The result is pretty noisy but he can 3-D print it. He scans a frozen dead rat, a star-shaped squash, a frozen sardine, and a large fish head.
on 02025-10-20#Hyperspace-Pirate #video on #bootstrapping/#manufacturing a #DIY #jugaad #X-ray #radiography machine #toread
on 02025-10-20#video on #materials with “dilatency” such as sand, where compressive stress increases their volume
on 02025-10-20#video captured on a home security camera of a meteorite hitting the ground and smashing
on 02025-10-20#Segerman #video #toread about a pseudo-scissor linkage #mechanism using gears instead of half of the links
on 02025-10-20a newish #video #toread by Eirik Brandal about #free-form #electronics sculpture
on 02025-10-20#video on "Antithesis", a whole-system #fuzzer using #virtualization to make distributed-system failures reproducible. “But the crazy thing is once I have a time machine, once I have a hypervisor, I can run until I make event A happen. And then if I notice that event A has happened, I can say this is interesting. I want to now just focus on worlds where event A has happened. I don’t need to refind event A every single time. I can just lock it in, right? It’s like if you play computer games, it’s like save scumming, right? It’s like I can I can just save my state when I got the boss down to half health and now always reload from that point.”
on 02025-10-19#video on #vanlife #stealth-camping by "Jana Vanana", who says she’s been doing it for 7 years and in particular has been stealth camping around Perth without any issues for over a year, even though most parking lots have no-camping signs. Her top tips are:
Condensation (in winter), for which she uses Bar’s Bugs anti-fog spray on her windshield.
Window covers: no reflective window covers in the front windows, because they’re conspicuous, but black umbrella-style sunshades on the windshield are totally common. She hangs a black cloth behind the front seats instead of trying to cover up the side windows of the cab. The other windows are blacked out with removable “blackout static cling window film” (for houses, not cars), so they look dark tinted, but let no light out.
Make people think you left, opening and closing a car door after you park.
Parking spot. She prefers parking near apartment buildings and never parks near the main entrances to houses. “For all anyone knows, I’m just visiting someone.” For larger vans, like the one she used to have: industrial areas like near the Auckland airport. Or parks without public toilets, or building sites where nobody lives yet, quiet streets between commercial buildings.
Keep the cab clean, no blankets and food wrappers.
Use headphones to watch movies.
Bathroom needs: laundry detergent bottles for men, kilogram-sized protein powder bottles or coffee cans for women.
Avoid parking near public toilets, because “rangers” (?!) check for stealth campers there first.
Exit through the front, because the side sliding door makes a loud van sound.
Park late, leave early. Before it gets late, you can park in a supermarket or public pool parking lot for a few hours.
Rotate locations: don’t stay in the same place two nights in a row, but cycle through a few different locations.
Keep your van clean on the outside as well.
Waay too much talking head footage, but whatever. A commenter suggests auto repair shops, since they always have new vehicles appearing. Another commenter points out that snoring makes as much noise as listening to a movie without headphones.
on 02025-10-18apparently "Plasti Dip" is a goo you can dip metal parts in to quickly add a non-slip rubberized coating, “usually used in adding grip to hand tools”. I guess it’s like dissolved in some kind of solvent that evaporates? #manufacturing #materials #video
on 02025-10-18#video about a minimal post-apocalyptic #sewing kit without a sewing machine. She likes leather thimbles, but puts seam rippers and tape measures on her nice-to-have list. Her seam-ripper/awl tool has a really nice design where the steel holders for the tooltips are supported on pairs of o-rings set into grooves in them so that they fit firmly when they slide into the metal bushings in the wooden handle. She also likes round-nose needle-nose pliers (for when needles are hard to pull out) and tweezers (for tying knots when you didn’t leave enough thread at the end of a seam). For a home sewing space she also recommends tailor’s shears, additional scissors for things like boning, a tomato pincushion, and another cushion for when you want to put down your needle. And a clear plastic quilting ruler. And a French curve for drafting. And an iron.
on 02025-10-18#video #toread about #Giertz #manufacturing a coffee table that transforms into an ottoman for her boyfriend’s feet.
on 02025-10-18#video #toread about Laura Messing and bio #materials in #Argentina
on 02025-10-18#video #toread of #faircompanies looking at bioplastic #materials at Barcelona’s Fabricademy, interviewing Anastasia Pistofidou, lead Material and Textiles researcher at Fab Lab Barcelona and co-founder and Scientific Coordinator of the global Fabricademy educational program.
on 02025-10-18#manufacturing fake leather #materials from orange peel #video (Susana Jurado, Elisenda Jaquemot, Nuria Bonet) from 20g wool, 5 ℓ water, 135g sodium alginate, 421 g (?!) glycerin, 56g coconut oil, an undisclosed quantity of calcium chloride, and I guess orange peel as a filler, but only 120g of it (maybe that’s the dry weight because it looks like it’s about 2–4 oranges, and they do run it through a dehydrator before grinding it to sawdust and sifting). The wool is added in hunks after 24 hours, and then the calcium chloride is sprayed on the top and bottom before drying 3–7 days. Fab Lab Barcelona, part of the SISCODE project.
on 02025-10-18#video #toread on “frying” food in a couple of kilos of hot salt (180°) in a wok after preheating for 8 minutes. Specifically chicharrones and palomitas. Suggests you can use the palomitas to measure the 180°. He also puffs some rice by presoaking it for 3–4 hours in water before mixing it into the salt. #cooking #materials
on 02025-10-18#video of #Twitch top stream #Emiru making a statement about getting grabbed a fan who tried to kiss her at TwitchCon yesterday, 30 minutes into her “meet and greet”. This is her business partner’s reaction video. 48' #toread
on 02025-10-18#Cesar #video #toread about bluing (“pavonado”) with burnt oil. He cleans it with thinner to degrease it before hanging it in a plumber’s blowtorch flame with baling wire to heat to 500°–600°, then quenches it in used motor oil from a mechanics’ workshop. #jugaad #manufacturing
on 02025-10-18#Giestas #video on #manufacturing cork-filled-agar-soled sandals using a corrugated-sole mold made from corrugated cardboard. The cork came from diced wine corks ground in a coffee grinder and sifted with a kitchen sifter to separate into cut, coarse, medium, and fine grades. 3 parts glycerin plasticizes 4 parts agar. A tiny amount of charcoal, ground in a mortar, is an additional filler for color. #Casting the heavily filled gloop in the cardboard mold looks fiddly. Used-tea-leaf tannin colors the alginate “leather” straps: 1 part alginate, 2 parts glycerin, 30 parts brown water, apparently by volume. The leather is crosslinked with a spray of 1 part CaCl₂ in 10 parts water. A box cutter tracing a masking-tape strap model tested over a sock cuts out the straps, which fit between the bottom sole and a lighter “midsole” made with 3 parts agar to 2 parts glycerin filled with coarser cork. Then the upper sole (insole) is softer, 1 part agar to 1 part glycerin filled with fine cork pigmented with mortar-ground tea leaves. Baked 1 hour at 100° with the fan on. #materials
on 02025-10-18#Giestas #video on #manufacturing an egg-shell-filled bioplastic bowl: 100mℓ water, 10mℓ glycerin, 15g agar, 2 drops clove oil, 100g eggshell (membrane removed, soapy-water-cleaned, oven sterilized, ground with mortar and pestle). So I guess the product is about 80% eggshell. He uses two glass bowls as the mold for #casting the thicker bowl. #materials
on 02025-10-18#video by #Giestas on #manufacturing a cup from used coffee grounds by binding them with agar and honey, melted in a double boiler before stirring in the grounds, then pressing the soft mass into a three-part mold made with #3D-printing, about 1cm thick. It suffers cracking damage from wetting/drying cycles. Oil of wintergreen to prevent mold, and he makes a planting pot. Relative quantities of honey, agar, oil of wintergreen, and coffee grounds are not disclosed. #materials
on 02025-10-18Gas pressure regulator #feedback #mechanisms #animation #video
on 02025-10-18#video on #casting ingots in a microwave kiln #toread
on 02025-10-18#video of #casting plaster of Paris and polyurethane in a high-density remeltable gelatin mold (50g water, 40g gelatin, 40g glycerin, but stronger if gelatin goes to 90g, maybe also with 2tbsp powdered sugar) without even a mold release. Alcohol spray to pop bubbles at the surface. #materials
on 02025-10-18#jugaad tattoo machine #video using a paperclip filed to a point, a 9-volt battery, a small electric motor, a drilled-out plastic gear, and a ballpoint pen tip, all held together with just hot glue (not even solder). Works on a banana. #humor
on 02025-10-18another #IMGUI #video #toread (by #Tsoding) 84 minutes
on 02025-10-18#Segerman #video #toread about #circus-arts
on 02025-10-18another #Blow #video with 2h36m on #IMGUI #toread
on 02025-10-18#video on #jugaad #vacuum setup using a Harbor Freight “Pittsburgh” hand-powered brake bleeder vacuum pump kit, silicone sealant, a big glass jar, some weatherstripping hot-glued to the jar bottom, and a silicone baking mat to make a vacuum gasket for the big glass jar top, cutting it with scissors. I think probably it would be good to wrap the large glass jar in some kind of metal mesh to protect you from flying glass shards when it implodes. He Dremels a hole through the glass lid with a tiny spherical grinding stone and a spray bottle of water as coolant. Also he confuses 20 inHg with psi.
on 02025-10-18#video on #jugaad #vacuum setup using bicycle check valves (Dunlop type) for the vacuum, a plastic syringe as the pump, and a glass jam jar as the vacuum chamber. You can melt holes in the polyethylene syringe with a soldering iron to mount a Dunlop valve for egress. Sealed airtight with epoxy, which probably isn’t as good as sealing wax but is probably just as good as the rest of the plastic syringe. A sawed-off Dunlop valve in a drilled hole in the jar’s metal lid serves as a hose fitting for a zip-tied rubber (?) hose to connect the syringe. At 3'50” there’s a demo of using it to degas epoxy for #casting. At 6'10” a demo of degassing two-part silicone.
on 02025-10-18#video showing repair of a flat-flex cable with microscopic bodge wires, solder paste, UV-curable glue, and I think some kind of glue to hold the cable in place during the repair.
on 02025-10-18#video #toread about #Alpha-Phoenix’s #precision 2-billion-frame-per-second #cameras
on 02025-10-18#Tech-Ingredients #video about #jugaad #laser directed-energy #weaponry against #drones #toread
on 02025-10-18#manufacturing small articles from superglue, and baking soda, in blu-tack molds? Repeating thin alternating layers of superglue and baking soda (he says “baking powder” but I suspect he’s confused) work best. Round-trip time is very quick, only a couple of minutes. At first I thought he might be using fillers but actually he just painted the parts after #casting. The process of removing the form from the blu-tack introduced noticeable distortion into the overall shape. #video
on 02025-10-18#circuit-sculpture lamp made with LED filaments replacing the metal filaments in glass fuses. #toread #electronics #video
on 02025-10-18#Posy #video about graphical equalizers on audio equipment with frequency-sweep measurements
on 02025-10-18#Segerman #video about single-degree-of-freedom deployable #mechanisms that fold up into an icosahedron, made with SLS #3D-printing from nylon
on 02025-10-18#video on “depth charge hydrostatic pistols” (WWII #weaponry #mechanisms #history). Water flowing into a rubber diaphragm inflated it, forcing two concentric flanged sleeves to slide axially apart, releasing the retaining balls inside the sleeves in a groove machined into the firing pin, which the firing spring then slammed through the copper membrane into the detonator. Orifice size determined water ingress speed to approximately set the depth at which the detonator and thus the surrounding booster and finally the entire depth charge would detonate, sinking a submarine. The two sleeves moving in opposite directions makes it shockproof since their absolute position doesn’t matter much.
on 02025-10-17#Nighthawk #video #toread about bioplastics #materials from potato or cassava starch, and spectrally selective cooling materials. 5 mℓ of honey can plasticize 30 mℓ of gelatin dissolved in 560mℓ of water and then dried in a food dehydrator in a silicone mold. Recommends a YT channel about bioplastics, @Giestas, a high-school teacher in Lisbon. Second recipe: 12 parts water, 3 parts cassava (or other) starch, 1 part vinegar, 1 part glycerin (as a plasticizer), optionally reinforced with cotton gauze. He claims you can separate potato starch by simple decantation. As usual, he butchers the science, claiming that freeze-dried starch gel is an aerogel. He claims that these starch gel films have high infrared emissivity, even though they look transparent to visible light. Third recipe, alginate — which, astoundingly, he mentions can be de-gelled by chelating the calcium with sodium citrate! And a suspension of calcium carbonate in sodium alginate can be gelled with vinegar, because that solubilizes the calcium! Or by using glucono-delta-lactone, tofu coagulant, to release acid over 10' to 20': 100mℓ water, 10g (sodium?) alginate, 2g CaCO₃, 2g GDL. Fourth recipe, agar, which dries into crystal-clear films that can resist water for a few days. 20g agar (!!) in only 100mℓ of hot water, 2mℓ dish detergent, whip with blender. #Giestas offers: “3 tbps agar, 2.5g citric acid, 3tbsp gli[cerin?], 1tsp baking soda” to produce foam; and “60mℓ agar, 30mℓ MGL [or “mel”: honey?], 60mℓ gli[cerin?], 180mℓ water, 5mℓ deter[gent?]”.
on 02025-10-17#video about controlling #motors with #FOC (field-oriented control) and using them as dials. Using SimpleFOCproject to do PWM microstepping of #brushless motors to get smooth motion down to zero velocity? Also steppers. The BLDCMotor constructor argument is the number of pole pairs, which he got wrong at first. But he’s cheating by using an AS5600 I²C magnetic encoder! This has the very interesting #UX idea of simulating mechanical detents by using the motor for haptic feedback on a knob. #electronics
on 02025-10-17#Alpha-Phoenix #video of a laser pointer at 2 billion frames per second. With a single pixel, so he then scans it over the setup with a gimbal-mounted mirror, and repeats the experiment, hundreds of thousands of times (3000 times per second). “Every one of these pixels was recorded separately, as a 1×1 pixel video!” Integrated encoder feedback in the motors was the key. He geared the pitch servo down with a timing belt to get better angular resolution because Katić, Domitran, Horvatek, and Lagator wrote a paper saying timing belt transfer accuracy was fine for angle metrology applications. “After figuring out which LLM code snippets were useful and which LLM code snippets were the reason I’d been frustrated for hours...” His optics train is one lens and one pinhole and, I assume, one photodiode. No, holy fuck, it’s a photomultiplier tube. His data acquisition rig is a benchtop 2Gsps oscilloscope, a Siglent SDS824X HD, 200MHz, 12 bits. He points out that the analog signal path amounts to a 58-frame delay line. To include the synchronization signal on the same line (because the scope can only do 2Gsps on one channel), he used a 500ns coax delay line from the laser. #precision #optics #cameras
on 02025-10-17“the most important talk on programming” #video by #Blow. I, uh, doubt it? #toread
on 02025-10-17#news #video about #Trump’s #Argentina bailout from the #WSJ, mentioning how #China bought millions of tonnes of Argentine #soybeans after #Milei dropped export retenciones after the September US$20B bailout (structured as a currency swap), enraging some #USA farmers. Also apparently in October the US Treasury bought pesos for the Exchange Stabilization Fund! Then there was an additional US$20B “private finance facility”.
on 02025-10-17#video #toread on using stepper #motors instead of #brushless motors for #3D-printing
on 02025-10-16#video #toread on adding gears to #bicycles with #3D-printing #mechanisms. The script seems to be AI #slop. The single-speed drivetrain design seems to be a useless gimmick with no technical advantage, and it adds a lot of weight to the bike, but the fabrication technique advice seems solid.
on 02025-10-16#video on designing “Static Core” #motors for easy #integration into #mechanisms by making them in the form factor of a pulley, so you don’t need to mount it on the opposite side of a mounting plate from whatever you want to drive, then use a shaft coupler to couple it to another shaft that’s supported on two bearings. Basically the idea is to not have a shaft but just spin the (permanent magnet, so no wires) brushless motor housing, with a timing pulley built onto it. But he didn’t gear the “frameless” motor down enough so his robot can’t overcome static friction to start.
on 02025-10-16#video of Sussman explaining a watch escapement by analogy to an LCR electrical circuit #toread
on 02025-10-15#video #toread about a remote benchtop setup (??!) for #electronics
on 02025-10-15#Posy #video about Cokin’s red polarizing filters for #photography, which only polarize red light, so that once you set the white balance you get rainbows from #polarization gradients. Except the rainbows he got were mostly from a regular polarizing filter and strained plastic (polycarbonate? acrylic? from a CD case) with wavelength-dependent birefringence.
on 02025-10-15#video of writing with #fountain-pens on #stone-paper. He doesn’t like the feel of the paper, saying it felt like walking in pudding. Also the pens went through the paper a couple of times, and one of his inks bled through, and trying it with a pencil, it totally embossed the page. He’d laser-roughed-up the tip of one of his pens, and the paper kind of polished the metal down, which I guess means the chalk isn’t very pure. “The worst paper I’ve ever used.” A commenter complains, “It also has very low heat tolerance. Leave in a hot car in the summer and all the pages will fuse together. Ask me how i know.”
on 02025-10-15#demo #video of #bootOS by Oscar #Toledo G., demonstrating entering a hello-world program byte by byte, running it, and deleting it. Also demos cubicDoom. #small-is-beautiful
on 02025-10-15#Segerman #video on the Cannon–Thurston map and the complementary space of the figure-eight knot. #math #toread
on 02025-10-15#video of Terry Davis’s #TempleOS livestream from 02016 about how he uses Holy-C files with just a bunch of #includes instead of a linker or linker scripts.
on 02025-10-15#Segerman #video on “wild” knots such as the wild slipknot which cannot be topologically deformed into polygons. Introduction to knot theory. #toread #math
on 02025-10-15#Segerman #video showing Sydler’s π/4 polyhedron from 01965, constructed by Matthias Goerner, in which all dihedral angles are 90° except for one, and talking-heading about the Dehn invariant. #math #geometry
on 02025-10-15#Applied-Science #video on using Cloudray’s GM-100 US$7000 100-watt MOPA laser to engrave diffraction patterns (LIPS: laser-induced periodic structuring) and near-holograms on stainless steel with LightBurn. “MOPA” is “master oscillator power amplifier” and gives you a lot of control over the pulse power waveform from a fiber laser. He holds his too-thin stainless-steel sheets down with an aluminum vacuum chuck to get repeatable focusing, which doubles as a heatspreader and a heatsink. 300mm/s and 300kHz, thus 1μm pitch, worked well to get diffraction gratings, which he thinks are made of varying-thickness oxide layers changing the phase delay. He was using 45ns pulses at 19.6% power. He tried making optical #holograms: “How could you not do it after you realize you have full pitch and angle control over a #diffraction grating?”.
on 02025-10-15#bigclive #video on putting a 1N5187 Schottky diode in series with a TP4056 lithium-cell charger to keep it from charging the battery all the way to 4.2V, potentially significantly extending the battery’s lifetime. The diode drops 350mV at 250mA, over 400mV at 500mA, and 330mV at 110mA. The charger starts oscillating toward the end of the charging process, and in the end the battery charges to 3.89V, which is supposedly 80% capacity. #batteries #electronics
on 02025-10-1541' #CodingAdventure #video on simulating smoke #graphics #toread
on 02025-10-14#3Blue1Brown #video on the Laplace transform. #math #toread
on 02025-10-14#video #toread about voice coil #robotics #hardware #mechanisms from #Breaking-Taps. Inspired by birds. Using Dyneema cable actuation. Glass-filled PTFE bushings, carbon-fiber bones pressed into holes in fittings. He actually gave up on the rolling-contact cable-ligature joints and switched to conventional sleeve-bearing pin hinges. Using voice-coil actuators.
on 02025-10-14#video on using #e-ink from Waveshare #tutorial #toread (but what I really want is current measurements)
on 02025-10-14#video #toread about common-base amplifier design in #electronics #hardware for #RF #communications
on 02025-10-14#video on using #e-ink tags #toread
on 02025-10-14microscope #video of Sharp #memory-LCD #low-power #LCD #displays #hardware
on 02025-10-13#EEVblog #video about #low-power #LCD #displays (like 14.3μA at 3.3V, up to 25μA during updates, 2.9" diagonal and 384×168) and why he prefers them to #e-ink: e-ink takes tens or hundreds of milliamps for a second or two to update. And service life is only 5 years or 10 million switches. He’s going to try the nice high-resolution ST7305-based #good-display.com (Dalian Good Display Co., Ltd.) reflective active matrix TFT LCD, even though the MOQ is 1000, because they sent him a demo board. It’s a nice high-contrast black and white and a very wide viewing angle despite (I think?) not being #memory-LCD. @mikeselectricstuff says the ST7305 datasheet says it supports up to 30Mbps over SPI. @afreestone101 says that if you peel the polarizer layer off the memory LCDs, the black color becomes mirror shiny. #electronics #hardware
on 02025-10-12#video on #Sharp’s discontinued 6-inch #memory-LCD, which was 24mW at 30fps.
on 02025-10-12#video of #Fraser looking at ancient Greek #automata, replicating a wooden mobile robot described by Heron of Alexandria. He talks through a bit of the #history of the Greek automaton tradition. A weight sinks down into an hourglass, supported by the sand (or in this case seeds) and pulling on cords which move the automaton; the cords are wound around axles, which have pins in them around which the cords can be wrapped to alternate directions of motion, without cam #mechanisms.
on 02025-10-12#video #toread of Charly Garcia and Sting with new (?) #music “In the city”
on 02025-10-11#video #toread of 8' of Ravindra Godbole making a sand-powered acrobat automaton. #automata
on 02025-10-11#video #toread of 6' of Shasa Bolton’s writer automaton laser-cut from MDF. #automata
on 02025-10-11#video #toread of 15' of #automata
on 02025-10-11#video #toread of 20' about Japan’s only karakuri doll master #automata
on 02025-10-11#video #toread of 6' about Oliver Pett’s #automata
on 02025-10-11#video #toread of 41' about #mechanisms and methods for making #automata
on 02025-10-11#video #toread about the #Jaquet-Droz #automata and in particular about restoring them.
on 02025-10-11#video about sand-powered #automata #mechanisms, lifting a bucket of sand with a hole in the bottom until the sand hits a stop. This yields a very predictable, slow motion that can last many minutes, powered ultimately by a spring or weight, originating in Heron of Alexandria’s shrine of Bacchus. Another approach, used in the automaton from 01863 shown in the video, dribbles sand onto a sort of water wheel made of paper, driving it with the weight of the sand itself. In this case the wheel can rotate either direction, and the sand goes directly onto the dead center of the wheel, so the wheel rotates chaotically. The box is sealed with the sand inside, so you can recharge its energy by rotating it slowly in a certain way to get the sand back into the hopper! On some versions, including one made by the channel’s owner, Michael Start of the House of Automata, the mechanism is visible through the clear back.
on 02025-10-11#video where #LaurieWired tries to explain the #Karger-Thompson attack and almost succeeds but gets a little mixed up. #security
on 02025-10-08#video about three-tube CRT projectors supporting 1080i video by #Technology-Connections
on 02025-10-08another comparison #video with #Sora-2 and Wan 2.5, using #nano-banana for some image editing. Oh and apparently Sora 2 is available on #higgsfield.ai now without a watermark, as Wan 2.5 is as well. (For which you can set the video duration) Also using Seedream 4.0. #toread
on 02025-10-08#toread #video interviewing Norman Dodd about his interview with Rowan Gaither, head of the Ford Foundation
on 02025-10-08#video by #Boston-Dynamics #robotics about their new three-finger opposable-thumb gripper.
on 02025-10-08#video on new anti-#Shahed #weaponry #drones from #Ukraine, battery-powered quadcopters with 500g of explosives for US$595, using a DJI digital transmission module. Displays some captured Russian drones.
on 02025-10-07#humor #video of #Sora-2 and Mr. Rogers discovering the problem of the paperclip maximizer
on 02025-10-07#video on #Murray-Smith’s channel by his brother explaining that he has died, committing suicide a day before his last video posted.
on 02025-10-07#Buddhism #video of Thich Nhat Hanh talking about “hungry ghosts” who are still alive in the flesh but do not know how to trust to receive love. #religion
on 02025-10-07#videogames streamer YourRageZ lent his “cameo” to #Sora-2 so his fans could make #humor videos about him, to which he reacts hilariously in this #video stream
on 02025-10-07more #Sora-2 #video #humor including MLK Jr. talking about Tung Tung Tung Sahur
on 02025-10-07#video comparing #Sora-2 to other #AI video generators Veo 3 and something called Wan 2.5, which is even worse than Veo 3. He uses "higgsfield.ai" to edit his photos with text instructions using "Nano Banana", which I guess is some kind of model. But he’s largely focused on marketing wank. #neural-networks
on 02025-10-07#Sora-2 #video comparison between real video and fake #AI video, which are pretty hard to tell apart. Then exploration of the risks; there’s a video by Tupac saying he faked his death, for example. Bob Ross fighting Mr. Rogers in the WWF ring isn’t as realistic. Einstein in the UFC against someone named Carter. JFK speaking: “I understand this artificial intelligence is blowing your minds. You know what blew mine? A bullet.” MLK and JFK doing a ding-dong-ditch in a doorbell cam. MLK cussing and crying about how he can’t handle having dreams all the time. Lots of concern about fake news. Most of the video is about concern for human animators and dumbshits talking to cameras and whether they can compete economically against AI.
on 02025-10-07More #Sora-2 #video #humor including a dinner between the Mona Lisa, the Girl with a Pearl Earring, and the Scream; rapper cat on skateboard; some kind of game show; Mr. Rogers explaining Generation Alpha slang; Einstein arguing with a UFC referee and lecturing on smartphones; MLK Jr. giving speeches about setting up servers; Ronald McDonald driving down the 110 in a burgermobile; security guards stopping a golden retriever from shoplifting ribeyes; MLK rickrolling you; pulling over a giraffe; anime Jesus throwing down the moneychangers’ table; an arrest for farting on the neighbor’s doorstep; a burglary by a leprechaun; J-Pop; more anime; a photorealistic Princess Peach in a pink Cybertruck; George Carlin claiming aliens invented Ozempic on Infowars; Muammar Gaddafi; Sam Altman on a game show choosing to release an AI slop generator; a skydiver outside the airliner window with a sign that says “I was your pilot”; Tupac giving a TED talk; C-3PO being traumatized by R2-D2 rejecting him on national television; cats fighting on the rooftop with lightning; mobility scooter GTA; a cat doing a kickflip; etc.
on 02025-10-07#Sora-2 #video #humor including Jake Paul getting pulled over in rainbow makeup, Stephen Hawking on a forklift, cats and horses getting blown away by the wind off people’s front porches, VHS children opening Christmas presents including a deportation order and a Content Violation, Bob Ross playing Minecraft and Call of Duty, etc.
on 02025-10-07animation explainer #video channel Kurzgesagt (24.6 million subscribers, 70 full-time employees plus freelancers!) laments how #AI will probably make their channel non-viable because AI slop will soak up most human attention
on 02025-10-07mildly traumatic #Sora-2 fake history #video #humor
on 02025-10-07more #Sora-2 #video #humor #toread
on 02025-10-07more #Sora-2 #video #humor: Michael Jackson in jail, Hitler coming out as gay, a medieval witch conjuring a smartphone to film her burning, a giant shark tempting a sailor with a mermaid, Michael Jackson teaching algebra, a dog on a roller coaster, Benjamin Franklin getting arrested, Einstein and Bob Marley in UFC, Michael Jackson getting pulled over, a baboon liberating a dog from a crocodile, the police pulling over a cat driving a fighter jet, Stephen Hawking on a skate ramp, Tupac in heaven, Einstein escaping a traffic stop in his convertible, Bob Ross painting 9/11, Michael Jackson as a Jedi, etc.
on 02025-10-07more #Sora-2 #video #humor with #Trump kissing Putin, selfie video from the Last Supper, Tupac and Biggie and Jesus at the Goodwill store, Michael Jackson and Hitler shouting in each other’s faces
on 02025-10-07#Sora-2 #video #humor of Hawking boxing, Hawking diving, Pikachu at a traffic stop, etc.
on 02025-10-07#Primitive-Technology grass mat loom #video. The loom is horizontal so it can be three meters long, but I feel like it is at an inconvenient height for working at, and also involves a lot of walking back and forth. Then he uses the mats as thatch for a small lean-to shelter, which seems like a pretty suboptimal use for them (“Gaps will let rain through”, as he says, so he folds them double), but I guess he doesn’t sleep out in the bush. Also I think he probably needs to treat them with some kind of preservative to keep them from rotting, smoke at least. #scouting #bushcraft #bootstrapping
on 02025-10-07#BBC documentary #video “Leningrad and the Orchestra that defied Hitler” about #Leningrad and #Shostakovich’s Symphony No. 7 in C major, Op. 60. #history #inspiration
on 02025-10-06#Primitive-Technology #video on cylindrical water bellows made from fired clay #ceramics with folded-leaf check valves, sunk in a clay-lined puddle to use as two liquid pistons. One of his undersized fired-clay handles broke off, so he lashes on wooden handles. He’s still doing a lot of unnecessary work lifting massive fired clay vessels. Then the spout broke off.
on 02025-10-05#Xiaomanyc #video where #Chinese teachers rate his level of Chinese: they say his pronunciation is imperfect (but not identifiably English-tinted), his vocabulary is weak, and his grasp of classical Chinese proverbs is nonexistent
on 02025-10-05#video on #asm programming for #UEFI, showing how to call ConOut, WaitForEvent, and GetTime UEFI subroutines from assembly, but using Microsoft MASM and the VC++ linker, gag. He tests his hello-world image in QEMU by writing it to a flash drive with a GUID partition table (not an MBR) with an EFI system partition. Sponsored by a mini-PC vendor. Also covers the EFI_GRAPHICS_OUTPUT_PROTOCOL (GOP) which contains QueryMode, SetMode, and Blt. Also how to start up additional processors (he’s on a 12-core amd64 machine) via EFI_MP_SERVICES_PROTOCOL. But UEFI doesn’t support keyup events! Only keydown events! So it sucks for his Zaxxon reimplementation. The EFI_SIMPLE_POINTER_PROTOCOL for talking to the mouse might be okay, although it only supports two buttons (gag).
#video #toread about how not to get killed by #drones #weaponry: umbrellas, tunnels, moving in the daytime, moving in thunderstorms, etc.
on 02025-10-02#video exploring #OpenAI’s #Sora-3 video generation #AI model for half an hour, comparing it to Kling 2.5 (which seems comparable), Hailuo O2, and the noticeably worse Veo3 (Google’s). Their “Cameo” feature has an interesting anti-deepfakes feature for iOS. #neural-networks
on 02025-10-02one-minute demo #video of "Sora 2" #OpenAI video generation #AI model #neural-networks
on 02025-10-02#video about #Argentina by Marcos Wolf, who’d been living in Ontario, Canada all his life until he came to stay in a hostel and AirBnB and visit his grandparents in Caseros for six months a year ago (although he’d been there 15 years before) #formina
on 02025-10-02#RFU #video from today on #Ukraine news on the front between Dolyna and Lyman; Ukraine is bombing Russian pontoon bridges with GBU39 #weaponry despite GPS jamming; artillery fire suppressed bridge replacement. FPV #drones are playing a supporting role.
on 02025-10-02#Xiaomanyc #humor #video in South #Korea where the people at a restaurant make joking-not-joking remarks about how he’s a spy for North Korea because he’s speaking North Korean dialect
on 02025-10-02#video #toread from three years ago about #Ukraine salvaging Russian tank machine guns for use as #weaponry
on 02025-10-02#humor #video about how American #English is crazy compared to #Chinese
on 02025-10-01#clickbait #video about upcycling (#recycling) paper into plastic-like waterproof (no! “water resistant”) #materials. The recipe is water, cornstarch (gelatinized with heat), vinegar as a preservative, coconut oil as a plasticizer, and white laser-printer bond paper, onto which the sauce is brushed with a paintbrush and then allowed to dry. For an inkjet printer, obviously that mix would make the ink bloom, so as a “great little hack”, she recommends spraying it with an unspecified sealant first (she just says “polycrylic”, which isn’t a thing). To "antique" it she suggests mixing some instant coffee into the sauce. To fix the paper curling she recommends ironing the paper in a folded silicone mat afterwards. I'm not persuaded that this is superior to silicone thinned with paint thinner.
on 02025-09-2929' #video by #Malawey on why engineering labs need rags. I didn’t know that there were auger-based PID-controlled charcoal barbecue grills with calibrated thermostats. He recommends diaper cloth for many jobs because it’s lint-free. #toread
on 02025-09-29#video by #Malawey on #manufacturing with #8020 and similar aluminum T-nut extrusions. He prefers the Automation Direct brand. 30×30mm has pricing of US$15/meter (M6 fasteners ideal, or M8 for the end holes, 9mm groove depth), 20×20 US$8/m (M5 fasteners ideal, or M6 for the end holes, 7mm groove depth), 35mm DIN rail US$5.20. He cuts them with wood-cutting blades on wood saws, although his "wood blade" looks like it has a brazed-on insert on each tooth, presumably tungsten carbide, and it appears to say “CARBIDE TEETH / DIENTES DE CARBURO / DENTS DE CARBURE”, so it could probably cut concrete. He recommends putting some wax on the blade to make a cleaner cut, by cutting a bar of wax together with the aluminum. He reports that it is also possible to get a clean cut on cut magnesium #materials with a saw this way. He warns that “V-groove” extrusions are needed for rolling V-groove wheels on. Sometimes your screws contact the bottoms of the grooves because they’re too long, which can be remedied with a thick washer. For wheels he recommends #3D-printing a bracket to hold a rollerblade wheel. He spends several minutes demonstrting how to use SolidWorks to design such things by pretending they’re weldments.
on 02025-09-29#Clough42 #video on #precision #manufacturing via #3D-printing, specifically, his filled ABS system (“eSUN ABS+”) shrank by about one part in 300, which ended up being half a millimeter in a 151-mm screw hole spacing part. He measures the hole distance with gauge pins and digital calipers by averaging the outside-of-pins distance with the inside-of-pins distance. “Typical ABS has over 0.8% shrinkage rate. ABS+ is less than 0.4%,” but actually he measured about 0.58% (5800ppm, or about 73ppm/°, assuming the part is at 100° while printing). His proprietary slicer Simplify3D has an option in Tools→Options→Models→Import actions→Scale All to do this automatically.
on 02025-09-29#tutorial #video says #Microsoft Office 365 Excel now supports Python; type =py in a cell and then you can use Pandas functions as pd.whatever, with an xl("B3") function to read cell B3. Seaborn is sns.
on 02025-09-29#video purporting to explain #China in which, within the first minute, this clueless plonker "Maxinomics" mispronounces “Xi Jinping”, and I don’t just mean he gets the tones wrong.
on 02025-09-29#video #Chinese about hipper alternatives to “ni hao”, such as “chī le ma” and “zao” and “ha luo”.
on 02025-09-29#video of #AOC speaking to criticize Charlie #Kirk in the House. #politics #USA
on 02025-09-29#video on #Chinese insults like “Cao ni ma”.
on 02025-09-29#video #toread about how insurance prohibits diving boards at most swimming pools in #USA now #collapse
on 02025-09-29#video of Kyla Scanlon explaining the global supply chain of bicycle #manufacturing, comparing Litespeed (American Bicycle Group) in Tennessee (in the #USA) to a Sri Lankan factory for Ozone. #economics
on 02025-09-29#video tips on #manufacturing #optics with silicone molding. He likes using the plastic cups the mold was made in to hold his mold halves together, injecting his resin with a syringe through aquarium tubing into the bottom of his mold to drive bubbles out the vents in the top, Smooth-on Crystal Clear 200 resin (despite only having 20 minute pot life), degassing, casting in a pressure chamber, including a straw or even funnel extension for the sprues/vents to provide an excess of resin, drilling your vents and sprues with hardware-store brass tubes with sharpened edges, and hanging the lens up from a sprue for a week to let it fully cure (to avoid getting flat spots from the lens’s weight during that time).
on 02025-09-29#Otzi #archaeology #video: he had a “retoucheur” made of an antler point pressed into the end of a wooden handle with just the end of the antler pointing out, which Smiti Nathan explains here was used to sharpen flint blades. Maybe like an “Ishi stick” that didn’t use up precious copper. It looks sort of like a pencil, and presumably you would sharpen the wood to expose more antler when necessary. Mentions that it’s in the South Tyrol Museum of Archaeology along with his corpse.
on 02025-09-29#video of talking-head filler about #Mythbusters #history: 15 years, 25 people, producing 300 hours of television. By my calculations, that’s 1¼ person-years per hour of television.
on 02025-09-29#video on Travis Mitchell’s #DIY metal #3D-printing with fiber laser SLM in an argon-filled chamber, which I guess he’s cutting out of steel sheet with a CNC laser cutter, which he says makes much cleaner cuts (less slag on the back of the sheet) when he uses oxygen as an assist gas. Seems to be using #8020 style aluminum extrusions for the frame. He’s going to try to print in 15–45μm 316L Würth stainless steel powder, and in this video he runs some powder-spreading tests with his crooked coater blade, but he’s not ready to actually laser the stuff yet. #toread
on 02025-09-29“Webinar - Analog schematic capture & simulation with Stefan Schippers”, who wrote Xschem. #Efabless #Tiny-tapeout #video #toread #electronics
on 02025-09-29#video by #Breaking-Taps on #manufacturing optically-clear epoxy copies of glass lenses by casting in silicone molds (Smooth-on Mold Max XLS); he gets 8.90nm RMS surface roughness on his copy, worse than the 1.74nm RMS surface roughness on the glass original, according to his AFM, plenty good for #optics. It worked easily for 10mm lenses, but it was difficult to get the process to work with 100mm lenses, with hazy surfaces (due to mold release), deviations from sphericality, etc. He says you can’t polish, lap, or grind plastic, which I don’t think is true of all plastics. A reader says, “Hey, I just want you to know that you can actually polish a plastic lens. I’m a lens maker in Canada and everything we do is plastic. We don’t always do PC but we do a ton of other materials. Everything gets polished.
we use a liquid polish and some abrasive pads, and I’m not exactly certain what kind of polish you could use for it, but it’s definitely something we do.”, and another comments, “I worked for years in a surface lab lapping and polishing plastic lenses all day. It’s absolutely practical”. A third says, “YES you can polish plastic as good as you can polish glass! You just need to use finer grit paper or less abbrasive [sic] materials and also you get the best result if you do wet sanding and then wet polish with VERY high grit sandpaper and oil or water. I do it myself so YES you can!” He sputtered metal (60nm silver) onto the glass as an alternative mold release that wouldn’t create micron-scale roughness. Smooth-on Accel-T tin-cure accelerator additive caused more shrinkage during curing of the silicone, ruining the figure of his mold. Relatedly, he says you want the resin to cure as slowly as possible, because fast-cure silicones shrink more. Mold Max XLS he says is 1000ppm shrinkage, EpoxaCast 690 is 2000ppm.
on 02025-09-28#video of #Evan-and-Katelyn #manufacturing #concrete keycaps for a custom keyboard with PVA glue replacing some of the water in the cement (like a quarter or half or something), using personal vibrators to get the mix down into the keycap molds where they’re overmolding keycap stems made with #3D-printing. Also they tried adding 3% chopped fiberglass to their concrete mix, which is totally going to fail. They also tried adding more sand. To suppress bubbles, they loaded the keycaps into a pressure pot to cure. The fiberglass concrete wasn’t sandable, breaking apart. The PVA concrete felt “super hard and dense”. They also made the outside of the case out of concrete. It weighs three pounds, and the wrist rest another 1.7.
on 02025-09-28#video #toread about making #DIY molds from flour and silicone #materials #toread
on 02025-09-28#video by #Makers-Muse about #3D-printing floppy elastomer filament #materials that aren’t TPU, like PEBA, polyether block amide (?) which apparently you have to print at about 250° to get good layer adhesion. Also, foaming TPU, glass-filled polybutylene terephthalate (PBT-GF), and regular polypropylene, for which you need to coat your bed with polypropylene packing tape or something to get it to stick. Also a TPU/nylon mix and PVA as a water-soluble elastomer. #manufacturing
on 02025-09-28#humor #video of #Evan-and-Katelyn ordering probably worthless and useless products
on 02025-09-27#video of #Evan-and-Katelyn #DIY #manufacturing a table with mannequin legs wearing high heels and also some worse ideas. #humor
on 02025-09-27#video of #DIY #jugaad body armor made out of a fiberglass welding blanket duct-taped to two layers of fired-clay ceramic tiles, which is able to stop some pistol and rifle bullets.
on 02025-09-27#Clough42 #machining #video about using fixture plates instead of vises. #toread
on 02025-09-27#video on "Cerro Gordo", California, which apparently this YouTuber named "Brent Underwood" bought 5½ years ago? Somewhat mountainous semi-arid desert. The video seems like mostly a bunch of people hanging out in the desert and the old mineshafts and recovering artifacts, but without recording where they found them. Near Nevada. #toread?
on 02025-09-27#Xyla-Foxlin #video on #3D-printing a rocket out of some kind of carbon-fiber-filled filament and #flying it. On her third attempt she broke the sound barrier.
on 02025-09-27#video #toread on #DIY #manufacturing rubrene, which is apparently a red- or yellow-fluorescent polycyclic aromatic hydrocarbon (5,6,11,12-tetraphenylnaphthacene), which apparently took him two years. Also it’s used as an organic semiconductor in OLED displays. #materials
on 02025-09-27#video on how to design safe pointer #lasers so they don’t short-circuit their batteries.
on 02025-09-27#video on how to stop fiber #lasers from drilling holes in your walls. Commenters suggest wet rockwool, rotating discs, and waterfalls.
on 02025-09-27#video on how A-frame tents are making a resurgence among ultralight hikers despite being a thousands-of-years-old design. Ten minutes of mostly overwrought talking-head filler to express one sentence. #camping #scouting
on 02025-09-27#video of #manufacturing silicone molds by thinning white silicone caulk with white spirit, painting it a couple millimeters thick onto a plaster (?) form over a wax mold release, backing it up with 5mm more of silicone caulk, backing that up with plaster, and using more plaster (with a little soapy water to prevent bubble adhesion) to make an object in the mold. Then, two-component polyurethane resin.
on 02025-09-27#video showing a polyethylene plant operated by BP, starting from #ethylene (usually derived from cracking naphtha #materials) at 1500 atmospheres and 160° with about 20% yield of polyethylene on each go-around, so the unreacted ethylene gets compressed again.
on 02025-09-26#video of stock footage and animations explaining how #ethylene is industrially produced by thermal cracking of ethane #materials distilled from natural gas at 850° (catalysts unspecified), and the ethylene is reacted with butylene (using other unspecified catalysts) to polymerize it. Free-radical peroxide initiation is not mentioned.
on 02025-09-26#video of #manufacturing a #Li-ion cell in a laboratory
on 02025-09-26#video of #Li-ion batteries catching fire and using a fireproof metal case to stop it.
on 02025-09-26#video of how to get back into a canoe by yourself when you’ve flipped it. #scouting #tutorial
on 02025-09-26More #medicine #humor #video with #Mikhail-Varshavski but this time not totally vapid
on 02025-09-25#medicine #humor #video with ice cubes in the rectum, etc.
on 02025-09-25#video on #Maslow-CNC making a #flat-cut sauna from plywood. He seems to be using four ropes to move the router horizontally on the garage floor now. #manufacturing #toread
on 02025-09-25#video by #Tom-Scott on personal Japanese hovercrafts made with simple tools
on 02025-09-25#video #toread by Zack Freedman about FDM #3D-printing weird filament #materials like sinterable zirconia
on 02025-09-25#video #toread about “pretendgineers” and odometer counter #mechanisms.
on 02025-09-25#AvE BOLTR #video about Milwaukee Fuel fencing stapler #hardware #mechanisms, including planetary gear sets, roller clutches, etc.
on 02025-09-25#video about #SLS #3D-printing: apparently Formlabs bought Micronics, so their US$4000 printer may never see the light of day.
on 02025-09-25#Veritasium #video about rubber #materials and their #history, and the risk of the South American Leaf Blight
on 02025-09-25#video of Jimmy #Kimmel’s opening monologue tonight, his first night back on the air. #USA #politics #censorship #human-rights
on 02025-09-23YouTuber Barack #Obama in Springfield, Illinois, announces he’s going to campaign for president, December 10, 02007. “I stand before you today to announce my candidacy for President of the United States of America.” #video #history
on 02025-09-23#video of #3D-printing a book of #mechanisms: planetary gears, scotch yokes, a geneva wheel, a belt drive, various linkages, etc.; “Machines in Motion” by AxelMadeIt, with about 70 3-D-printed parts. Unfortunately he added some horrible AI slop doggerel. #manufacturing
on 02025-09-23#news #video from #CNN saying #Kimmel is returning to the air, under pressure from people including Ted Cruz. #human-rights #censorship #USA #politics
on 02025-09-22#video of surveillance #drones #decentralization to, supposedly, compete with Anduril by strapping an ESP32 to a DJI drone
on 02025-09-22#Obama #interview #video disagreeing with some of Charlie #Kirk’s ideas, like the idea that his wife or Justice Jackson doesn’t have adequate brain processing power, or the idea that Martin Luther King was awful, or the idea that the Civil Rights Act was a mistake, etc. Hour-plus. #USA #politics #toread
on 02025-09-19talking head #video of trans woman Brianna Puppet complaining about the “crab-bucket mentality” and “monologuey sharing culture that would get nothing done” and how “the easiest way to gain social clout in a group of people who identify as leftists is to constantly center your own vulnerability and weakness and helplessness.” “Well, if they like me when I’m weak and they don’t like me when I’m strong then they’re not really my friends.” “Who does it benefit for us to be constantly leaning into our own weakness? Why do we spend so much time ranking people according to their perceived privilege?”
on 02025-09-19#video #humor #news of last night’s Stephen Colbert show about #Kimmel’s firing #censorship #human-rights #USA #politics
on 02025-09-19#video #humor #news of last night’s John Stewart Daily Show about #Kimmel’s firing #censorship #human-rights #politics #USA
on 02025-09-19#news #video of Robert Garcia on MSNBC talking about the #Kimmel #censorship investigation. Also CNN coverage. #human-rights #politics #USA
on 02025-09-18#video on “real” non-national passports, like from the Haudenosaunee, Australia’s Aboriginal Provisional Government, and the order of Knights of Malta, and the UN laissez-passer. Video consists of bullshit stock footage so I didn’t finish it.
on 02025-09-18#video of #manufacturing with a suitcase-portable die-cutting machine to upcycle from aluminum cans #toread
on 02025-09-18#video of 01970s analog tank simulator in #Switzerland, now open to tourists in the “Swiss Military Museum, about an hour north of Zurich”. They had to rebuild the computerized part of the model on a Raspberry Pi!
on 02025-09-18#CNN #news #video describing the cancelation of #Kimmel as part of #Trump’s “crackdown on dissent”. #USA #politics #human-rights #censorship
on 02025-09-18#bigclive #video explaining those little electromagnet-powered “perpetual motion” desk toys, showing the circuit consisting of a single npn transistor and the electromagnet, which is actually sort of an autotransformer. A high-resistance winding feeds some current from the emitter into the base, and then a low-resistance winding runs from the base to ground, while the collector is held at 6V. As he explains it, the approaching magnetic target starts switching the transistor into conduction, and then the transistor turns itself the rest of the way on? But then at some point the current stops rising, so the magnetic field stops rising, so the current into the base stops, and the transistor turns off, and the falling current snaps it even more thoroughly off. He reports that it still works if you add a flyback diode across the low-resistance winding, which is what you would normally want to do, but they don’t bother; I assume that drives the emitter-base junction into backwards (zener or avalanche) conduction during turnoff, and I don’t know what effect that has on the voltage. One of them has a duodecahedron I don’t recognize at its center, consisting of quadrilaterals that aren’t rhombuses; maybe it’s a distorted rhombic dodecahedron. #electronics #hardware
on 02025-09-18#news #video saying Jimmy Kimmel’s nightly comedy show is being pulled off the air indefinitely because of “Charlie #Kirk remarks,” specifically because #Kimmel initially claimed that Tyler Robinson was a MAGA Republican. The FCC chairman Brendan Carr threatened Disney and ABC with retaliation on a “far-right webcast” or “podcast”, which apparently is “X/Benny Johnson”. #human-rights #censorship #USA #politics
on 02025-09-17#news #video of Jesús Enrique Rosas questioning why Tyler Robinson’s purported text messages from Lance Twiggs ask things like “Why did you do it?” and “How long have you been planning this?” rather than “Are you safe?”, “Can you escape?”, and “Do you need to flee to Mexico?”
on 02025-09-17#news #video of Candace Owens claiming she talked to Lance Twiggs’s family who explained that Tyler Robinson was paying rent to Lance’s family who owned the house where they were living. #Kirk #USA #politics
on 02025-09-174-minute #video of Charlie #Kirk “taking down an anti-gay extremist” although he still sounds pretty extreme himself. #USA #politics
on 02025-09-17#video #news of #Tucker-Carlson calling for civil disobedience if #USA passes hate-speech laws in response to the #Kirk assassination, saying that the thinking Pam Bondi articulated on camera is exactly the reason young people believe “it’s okay to shoot people who say things they disagree with”. #politics #video #USA
on 02025-09-17#video #news of #Tucker-Carlson calling for civil disobedience if #USA passes hate-speech laws in response to the #Kirk assassination, saying that the thinking Pam Bondi articulated on camera is exactly the reason young people believe “it’s okay to shoot people who say things they disagree with”. #politics #video #USA
on 02025-09-17#news Steve Bannon, Candace Owens, and Hasan Piker think Tyler Robinson’s text messages to Lance Twiggs are fake, because they too neatly wrap up all the loose ends, including an unnecessary confession, unnecessary mentions that his dad is MAGA, etc. #Kirk #USA #politics #video
on 02025-09-17#video from a month ago showing Charlie #Kirk hating and fearing Muslims, and showing footage where he explicitly rejected the idea of separation of church and state. #USA #politics #history
on 02025-09-16KnowYourMeme #video on the Charlie #Kirk assassination: 2-minute. #USA #politics #history
on 02025-09-16#video of George #Carlin #humor criticizing the Iraq War, etc. #toread
on 02025-09-16four-hour #video #interview #toread with #CIA whistleblower John Kiriakou
on 02025-09-16#video #interview excerpt with #CIA whistleblower John Kiriakou (the guy who was sentenced to 30 months in prison for revealing that the #USA was torturing people, then supported #Snowden) about the #Mossad, describing how they called every single nuclear scientist in #Iran on the phone on the same day to threaten them with death — and then calling their wives. And then killed them. He says that spying on #Israel was absolutely verboten when he was at the CIA.
on 02025-09-16#video of standup comedian Maddie Wiener #humor about #incels
on 02025-09-16Tweet from 02022 about #Fuentes and his “cozy.tv”: “Nick Fuentes has launched a new streaming video platform called Cozy.TV. What makes it special? ‘It’s free speech. No censorship. We are anti-gay, anti-woman, anti-Black, antisemitic.’” #video #USA #politics
on 02025-09-16#video on new #Kirk assassin Robinson evidence: DNA matches, engraved shell casings in his house, text message evidence #USA #politics
on 02025-09-16Sabine #Hossenfelder #video summarizing the #AI bubble bursting signs
on 02025-09-16#crime #video showing James Rayl getting shot to death by Mitch #Duckro once he broke open the front door, staggering away toward the driveway as he received more gunshots, before collapsing where he died.
on 02025-09-16bodycam and Ring camera footage #crime #video “Dad Kills Daughter’s Obsessed Ex” of Allyson #Duckro’s father Mitch killing her ex James Rayl with three shots on the front porch after he tries to break into her parents’ house through the front door in Sidney, Ohio in 02022, where she lived with her father and her mother Stacie Duckro. The neighbors come over and sportscast Rayl’s gradual death. Allyson: “I’m not mad at you (...) You’re the best dad ever. You just saved my life.” But all three of them are pretty traumatized, and Allyson has chest pains that may be related to her heart condition. The voicemail he left her the night before (after she hadn’t talked to him in a year) didn’t seem especially obsessed or threatening; it sounded like he was just hoping to reconnect with her.
on 02025-09-16#video of Tyler Robinson’s hearing today; the next hearing, a “waiver hearing,” is September 29th at 10 AM, via WebEx. The judge issues a pretrial protective order in favor of Erika Kirk. Judge Graf reads the charges, including a “victim targeting enhancement” (Utah code, annotated, 76-3-203.14(2)) because it was a political assassination. #USA #politics #Kirk #news
on 02025-09-16#news #video footage of Tyler Robinson charges being read by County Attorney Jeff Gray. Refers to the roommate/lover (who Robinson allegedly asked to delete text messages) as “him”, suggesting Robinson was bi or gay, although Chris Stewart (the troll who created this video) says the roommate was MtF trans. “A biological male who was involved in a romantic relationship with Robinson”, according to the prosecutor. Robinson’s text message: “I am still ok my love, but am stuck in orem for a little while longer yet. Shouldn’t be long until I can come home, but I gotta grab my rifle still. To be honest I had hoped to keep this secret till I died of old age. I am sorry to involve you.” Then he confessed. When asked, “Why?” he said, “I had enough of his hatred. Some hate can’t be negotiated out. If I am able to grab my rifle unseen, I will have left no evidence.” Prosecutor also alleged, “Robinson’s mother explained that over the last year or so, Robinson had become more political, and had started to lean more to the left, becoming more pro-gay and trans rights oriented. She stated that Robinson began to date his roommate. This resulted in several discussions with family members, but especially between Robinson and his father, who have very different political views.” The video is unbearably long and full of talking heads and repeated stock footage and stills. The trolls making the video say they expect federal charges, though so far only state charges have been filed, and that probably Robinson would be better off in a Federal prison. #USA #politics #Kirk
on 02025-09-16#Susan-Walters #video describing part of how she killed the hitman her husband sent to kill her. In the comments, she clarifies what the hitman said: “His last, and only words, to me were You’re strong. After my divorce I considering changing my last name to Strong.” #crime
on 02025-09-16#video with lots of talking head and stock footage filler about how, in September 02006, 260-pound nurse Susan Kuhnhausen (now #Susan-Walters) strangled Edward Dalton Haffey, the hitman her husband hired to murder her after 17 years of marriage after she filed for divorce during a temporary separation. Haffey was a Vietnam vet working as a janitor who had murdered his ex-girlfriend previously, and he tried to kill her with a hammer, which she wrestled away from him and hit him with, later biting him, and finally strangling him from behind. Her husband died of cancer before his parole. #crime
on 02025-09-15The source in which Charlie #Kirk appears to have said killing gay people was “God’s perfect law”, a “Thoughtcrime” panel discussion with four people. Kirk in #video clip: “The second part is Leviticus 19. So you love God. So you must love his law. How do you love somebody? You love them by telling them the truth, not by confirming or affirming their sin. And it says, by the way, Miss Rachel, you might want to crack open that Bible of yours, in a lesser-referenced part of the same part of Scripture, is in Leviticus 18, is that thou shall lay with another man, shall be stoned to death. Just saying. So, Miss Rachel, you quote Leviticus 19, love your neighbor as yourself, the chapter before affirms God’s perfect law when it comes to sexual matters.” #USA #politics #history
on 02025-09-15#video of planarian regeneration with 30× magnification
on 02025-09-15#video of photos of design fails, many involving unintentional genital #humor
on 02025-09-15#video on how poor pedestrian infrastructure can be in #USA, for example in New Jersey
on 02025-09-15#video #history of #landmines #weaponry, though badly diluted with talking-head filler with a guy cosplaying as a soldier
on 02025-09-14#video overview of current naval #weaponry
on 02025-09-14#ElectroBOOM #video showing, among other things, how a high-voltage, low-energy arc (created with his 10kV voltage multiplier magic wand) can control a much-higher-power arc
on 02025-09-14AI #video of a very good photorealistic #Simpsons conversion. #humor
on 02025-09-13#video #toread “100% Blown Wing Powered Airplane” #flying a STOL model
on 02025-09-13#Steve-Mould #video of #spiral-phyllotaxis #optical-illusions with #stroboscopes with the brand name "Novatropes"
on 02025-09-13#video of #flexures for #3D-printing a sort of 50-gram plastic carabiner for a #manufacturing competition at “Maker Retreat”; it broke at 1.1 tonnes.
on 02025-09-13#Anduril #Anvil #weaponry demo #video, showing that it’s a brick-shaped battery-powered quadcopter designed to knock down low-altitude #drones
on 02025-09-12#video #toread of Fractal Block World, a video game where you can shrink and grow. #videogames
on 02025-09-11#video #toread of learning to read #Chinese (without pinyin? why?)
on 02025-09-11#video #toread of #Chinese common phrases to practice for saying goodbye
on 02025-09-11#Kissinger #video from 02022 commenting on, perhaps, the #Ukraine war. #toread
on 02025-09-10#video #history footage archive at UCLA including commercials and #news
on 02025-09-10#history #video #news (PBS MacNeil/Lehrer News Hour) from December 5, 01994 over #NATO expanding to include Poland, Hungary, the Czech Republic, and Slovakia. Yeltsin opposed it at the CSCE Summit in Budapest. Jack Matlock (former #USA ambassador to the USSR): “The question is not if but when.” #Kissinger: “The Russians are not unhappy about the timing; they are unhappy about the fact [of NATO expansion].” Kissinger thought the expansion should happen as soon as possible, while Matlock didn’t, but both agreed that the Russians were very unhappy. Kissinger: “If we are reluctant to antagonize the Russians today when they’re weak, it is an illusion to think that somewhere three, four years down the road, we can suddenly move in that direction when they’re stronger.” Later, he says, “I don’t see why [adding Poland] should provoke them especially since we could make military, we have, for example, in Eastern Germany we have military arrangements whereby no non-German troops go beyond the Elbe.” I suspect those arrangements no longer exist. “We could make similar arrangements for Poland that no non-Polish troops will be stationed on Polish territory.” Kissinger paraphrases Yeltsin: “Anything east of that yellow-shaded area [Poland, Slovakia, Hungary] was connected to Russia as blood brothers.” Interviewer: “That’s Belarus and #Ukraine.” Kissinger: “...and strongly implied that no outside influence was permissible there.” More shockingly, Kissinger said, “I don’t think the Russian situation will ever become a clear-cut military threat.” Matlock: “There is one other factor we seem to be forgetting, and we did (though it was not a legally binding assurance) we gave categorical assurances to Gorbachev, back when the Soviet Union existed, that if a united Germany was able to stay in NATO, NATO would not be moved eastward.” So that wasn’t just something Putin invented. Kissinger (who at one point slips and refers to things being subject to “negotiation with the Soviets”) comes off as a terrible liar. Matlock: “It will definitely, as things stand now, leave the impression in Russia that the West is cutting them off and moving the line closer to their border. (...) the impact would be very negative in Moscow, in Russian politics, and would not be a service to those who want democratic institutions.”
on 02025-09-10#video #news claiming #Poland just shot down a bunch of Russian Shahed-style #drones deep inside its airspace, which were shot down by Polish, German, Dutch, and Italian forces (operating out of Estonia), and #NATO has convened a special meeting. Russia questions whether the drones are of Russian origin. #Ukraine #politics
on 02025-09-10#video talk by Kulukundis on #Swiss-Tables at cppcon 2019. #toread
on 02025-09-09#video of a talk by Kulukundis at cppcon 2017. Kip says, “Presentation about the latest tricks in hash tables. Uses SSE instructions and man is it fast. Good benchmarks against the standard C routines.” Heh: “As with anything like this, benchmarks are the only source of truth you will ever get, and they are lies.” Called "Swiss tables" (because Alkis and Roman, its primary developers, “are in the Zurich office”, and it’s “closed hashing”), supposedly the fastest hash table in the world. “What did we gain? (...) the vague feeling of superiority when we force a difficult decision onto the user. And that is the #C++ way.” You put metadata about which array elements are full or deleted into a separate byte array, along with truncated-to-7-bits hash values, to avoid needing magic sentinel values for your key type. By using SSE matching to look for truncated-hash matches in a 16-bucket group, you can find the candidates in three instructions, which also means that your erase function can avoid inserting tombstones “if any other element in the group was empty”, which seems like a pretty big win actually. Also he mentions “other sizes [than power of 2] with fast modulus”. #algorithms #performance #hashing
on 02025-09-063' #video of #Signal CEO Meredith Whittaker about #AI risks: agentic AI will need to have basically root on your phone in order to do the things it’s marketed for.
on 02025-09-0661' #video #toread of Rich Hickey’s 02011 Strange Loop talk, “Simple Made Easy”
on 02025-09-0621' #video about #machining difficult parts, or failing to do so. Specifically, free hobbing worm wheels with a homemade hob was really difficult because the hob kept cutting the wrong number of teeth.
on 02025-09-0628' #video #toread by #faircompanies about a dome home in Spain with geothermal something
on 02025-09-062-hour #video #toread with relaxing Zulu #music
on 02025-09-0625' #video #toread on how to use the NanoVNA vector network analyzer #electronics
on 02025-09-0616' #video #toread by #CodysLab on #mining magnetite #materials (on the beach with a shovel?)
on 02025-09-066' #video on #Ibanis-Sorenzo’s wirenut #mechanisms made by #3D-printing: a split screw with a flexure at one end clamps down on the wire when compressed with a conical nut. He calls it a “lever screw” but there’s no levering going on.
on 02025-09-066' #video about an analog #electronics circuit for adding a dc bias to an (amplified) ac voltage using an opamp for a “validation engineer” test. The circuit was actually designed to power an op-amp with controlled ripple on its power supply to test its PSRR. He keeps using Laplace transforms without comment, I guess I need to level up!
on 02025-09-0616' #video by #Diffraction-Limited on an open-source laser interferometer with 100nm #precison over 200mm. He ended up using a US$20 110mW 520nm OSRAM PLT5 520B laser diode with a coherence length over 4 meters, stabilizing its wavelength with feedback altering the drive current. He uses a corner-cube reflector to produce a return beam path offset to avoid backreflection into the diode in his Michelson-interferometer design, and an additional measurement arm (using a glass plate as a double beamsplitter) to provide wavelength/frequency feedback. Voiceover is probably AI text-to-speech. #mechanisms
on 02025-09-06#video #toread by #Murray-Smith about #3D-printing some sort of electric generator #mechanisms?
on 02025-09-065' #news #video of autonomous #drones #weaponry contract won by a company in Texas #USA named Mach Industries, founded by 21-year-old MIT dropout Ethan Thornton, and its high-altitude-dropped fixed-wing project Glide and parking-lot-launched Viper, and balloon-launched Stratus, visualizing warfare with tens of millions of balloons #politics
on 02025-09-06#video #toread of British RP #phonology, analyzing Queen Elizabeth II’s changes in pronunciation between 01957 and 02021.
on 02025-09-03#video #interview with woman Naomi Swartzentruber who left the #Amish 27 years ago at 17 and later worked as a stripper in Vegas. “I was speechless, because I thought that strippers were bad people because of how I grew up.” Then she explains how she got hooked on crack and went into #prostitution to survive, then moved to Vegas and LA and got her phlebotomist license, etc. Now she visits her Amish family once a year.
on 02025-09-03#video on #Amish people, an #interview with an ex-Amish woman Naomi Swartzentruber, who says that Amish people do swear, even though it’s prohibited.
on 02025-09-03#video on #NASA’s EAST, Something Air Shock Tunnel, where they dump 1.25MJ into an exploding bridgewire to rupture a rupture disc and produce a 48km/s shockwave in a tunnel.
on 02025-09-03#Technology-Connections #video dissecting an “Aeocky” rotary desiccant dehumidifier, which uses red-hot heating elements, a shaded-pole fan motor for the regeneration air, and a plastic cross-current heat exchanger to regenerate the desiccant and recondense the water. The main desiccant wheel has air forced through it by a large (300mm?) BLDC-like fan. He reports that it’s much smaller than vapor-compression types, the fans only consume about 12W, but the regeneration heating element is 300W, very similar to a vapor-compression device, condensing some 100g of water per hour (11kJ/g water), about ⅕ as much as the refrigerant-based unit. A Peltier-based dehumidifier was about as efficient as the desiccant-based unit in his moist bathroom, but the desiccant-based unit was able to remove water even from the 40%-RH air of his office. Most the ones he found on amazon.co.uk in the US$170–300 range were 580–735W, 7.5–11ℓ/day, and 6–7.5kg, most being almost twice as efficient as the one he tested (≈5kJ/g water). Recommends an adsorption dehumidifier brochure from Technofrigo Tuscany (“TFT dry air solutions”). #desiccants #mechanisms #HVAC
on 02025-09-03#video #toread about folding #robotics actuator mechanisms using an endless cable around two pulleys (with multiple turns of the cable around the smaller pulley) into a very compact package with four idlers.
on 02025-09-03#video #toread by #Bitluni on how he built a miniature data cassette tape drive #electronics
on 02025-09-03#video explaining oscilloscope probe compensation for #electronics with the Laplace transform. #hardware
on 02025-09-03#video #toread on ball-joint-based open-source XYZ sub-micron #precision translation #mechanisms using NEMA17 stepper motors and some homebrew magnetic encoders, with 5-arcsecond microstepping in open-loop operation, but using an MT6835 21-bit magnetic angle encoder IC to overcome the hysteresis in the steppers’ laminations and friction. The magnetic encoder uses “magnetic gearing” in the sense that it has 17 permanent magnets with alternating orientations moving past the IC in about a quarter turn, so you get about 68× higher precision (but no absolute readout).
on 02025-09-03#video on #Jupyter #simulation of #electronics with #LTSpice. He’s using a library called spice_invoker and using some canned functions that invoke maybe matplotlib to plot the characteristics curves of various hypothetical transistors. #hardware
#video on video driver regression #testing in #videogames and #latency (“microstuttering” and “hitching”) on Linux. No, on Windows (10? 11?) due to mtkwecx, the MediaTek integrated Wi-Fi/Bluetooth hardware driver, which also causes replugging the keyboard and mouse to not work. Disabling the hardware in the BIOS solves the problem. So does downloading an updated driver from ASRock, but only for the keyboard/mouse problem.
on 02025-09-03#video #toread of building a secrete workshop in a 500-year-old Spanish farmhouse.
on 02025-09-03#video of conflicts being de-escalated with pepper spray
on 02025-08-31#AI #video #humor of babushka reacting to fake videos of herself
on 02025-08-31#video of Venom movie clip (first fight)
on 02025-08-31#video about breathing pure oxygen through a Bane-like oxygen mask for “superpowers”, specifically, enhanced athletic performance in distance running, and maybe a so-called “Murph” workout. Mostly beefcake talking-head filler. It apparently didn’t actually work.
on 02025-08-31#video #toread about #laser engraving on metals in color
on 02025-08-31#video #toread of shooting sodium #materials at a watermelon
on 02025-08-31#video #toread of pouring molten aluminum into a watermelon
on 02025-08-31#video of a Jack Reacher clip from the series, meeting with his “client”, pretending to be a lawyer, about counterfeiting. Then pretending (?) to be a federal investigator. Then he uses his tie to strangle the guy sent to kill him with, oddly, a knife, but only strangles him for 21 seconds, which doesn’t seem like nearly long enough. Perhaps this dramatic license will save a few lives when real-life criminals try to imitate him. #fiction
on 02025-08-31#video #humor on a hidden-camera joke
on 02025-08-31#video #toread on #manufacturing a servo-controlled word clock #mechanisms
on 02025-08-31#video #toread on Mrs. Chen in Venom
on 02025-08-31#video #toread by #Nerdforge about making herself a new finger
on 02025-08-31apparently Guillermo Francella’s movie "Homo Argentum" is controversial in #politics? #video
on 02025-08-31#video of blonde Californian pranking people by pretending not to speak Spanish. #humor
on 02025-08-31#StuffMadeHere #video of his egg cracker #mechanisms #toread
on 02025-08-30#video of concrete #vibrators by super adorable #Evan-and-Katelyn. They found that the personal vibrator worked best for removing bubbles from concrete.
on 02025-08-30#video of making a guerrilla firefighter sculpture he installed in Clovis, CA
on 02025-08-30#video of #manufacturing pots by turning stones (limestone?) on a belt-driven electric lathe, in, supposedly, Iran. Looks like they’re using single-point brazed-on tungsten-carbide tools (or would they have to be diamond?), but I wonder if you could do this with a star wheel. Quite an impressive spray of stone fragments and dust! The stone is epoxied to a flat ring (presumably steel) that gets chucked up in a 3-jaw lathe chuck. At the end the dude finishes it off by hand with a tool brazed onto some rebar rested on a 2×4! They saw the base off with a large abrasive saw, and some cuts with a huge angle grinder form a decorative octagonal rim.
on 02025-08-30#Infobae #news #video on #Argentina buying #drones #weaponry. They’re talking about Eron, Milkor, and Elbit’s Hermes 900. Mostly talking-head filler, supplemented by Elbit’s advertising footage.
on 02025-08-30#video on #Ukraine #drones #weaponry, which it said is largely made by Vyriy and the Vampire’s maker Skyfall. Says dropping 10kg TM62 anti-tank mines onto tanks, and also dropping heavy bombs from drones, is a “warfare first”. The Vampire (Baba Yaga) can carry them 10km. Says the Donetsk battlefield is “dominated by FPV drones on both sides”. The most popular ground drone is Ratel’s 35kg-capacity Ratel S or “Honey Badger”.
on 02025-08-30#video on #USA developing lightweight precision grenade launcher #weaponry “squad support rifle system” (by “Barrett” and/or “FN Herstal”?) and “precision grenadier system”, with programmable but unguided grenades, similar to what #China has already fielded against “insurgents and pirates”, the QLU11, in service since 02011
on 02025-08-29#veltas (Christopher Leonard) #screencast #video of 40 minutes of #Forth programming of a “script” command which appends a line of interaction to a file before interpreting it, reading the docs in mupdf. 41'. Interesting to see some REPL hacking in GForth.
on 02025-08-29#handcam #video of FreeFire #videogames on an iPhone, from the channel ESPORT HAND CAM, using the #3fingerclaw technique
on 02025-08-29#video #interview with #Perón in 01973 asking him what he would do once he became president. He says he’ll try to summarize. 1½ hours. #politics #Argentina #history #toread #es
on 02025-08-27#news #video from #Fox saying #Trump is more or less invading #Venezuela. #USA #politics
on 02025-08-27#video #interview with #Frondizi. 23'. He says General Poli (?) who ousted him from power came to believe that it was the greatest error the armed forces of #Argentina had made in their #history, and that he maintains good relations with the Church and the armed forces. Lots and lots of anecdotes; he claims five Air Force pilots came to ask him permission to assassinate #Perón, which he denied, saving Perón’s life. Much etc. #politics
on 02025-08-24VEMAG brand double-screw extruder screw pump #mechanisms pumping M&Ms and ground meat. #video footage of the parts being washed.
on 02025-08-24Youtube #video by Snørling introducing a #zoned-storage command set
on 02025-08-21#video #toread on a small computer with HDMI out built out of two #Raspberry-Pi Picos on #Pimoroni boards
on 02025-08-21#video #toread on #retrocomputing "PicoCalc" running BASIC on a pocket computer
on 02025-08-21#video #toread #PewDiePie “accidentally built a nuclear supercomputer” apparently after #selfhosting and #degoogling
on 02025-08-21#video on “isometric” #videogames. The author apparently doesn’t know the difference between the isometric projection and other axonometric projections, so the video is actually about axonometric projections. Lots and lots of video game footage. He also mistakenly describes the Amiga as a 16-bit machine.
on 02025-08-21#video on building a #Raspberry-Pi pocket computer #toread
on 02025-08-21#video on post-apocalyptic #sewing #survivalists #toread
on 02025-08-21#video on charging #NiMH #batteries with an LTC4010, which includes a synchronous buck converter to efficiently charge the battery
on 02025-08-14#video of four hours of #Blow on #IMGUI. He’s programming in #Jai and struggling to understand why his UI isn’t doing the right thing. I think this video might be from 02021, halfway through his Sokoban game. In watching frame by frame, I notice that he has one (or sometimes two) frames of lag before initiating mouseover effects (tweened animated fades to brighter colors, etc.) on his IMGUI widgets. (Some of them “breathe” at about 1Hz when the cursor is over them.) Also a frame or two of lag is visible with the mouse pointer when he’s dragging windows. He sure spends a lot of time restarting his game; it takes 8 seconds from recompile initiation to seeing the cutscene, and then by default it plays for a few seconds, though it can be cut short to a single second. if ui.begin(panel, resizable=false) { ... defer { ui.place_rect(0, outer_margin); ui_end(); } ... ui.radio_button(*debug_mode, .Lightmap, *theme); ... ui.separator(); ui.label("Paint color", w=100); ui.same_line(); ui.color_edit(*paint_color, linear=false); ... if ui.button("Swap colors") { Swap(*paint_color, *clear_color); } ... ui.separator(); ui.checkbox("Airbursh", *airbrush); It seems like his .separator() is a small amount of vertical space. For tooltips, ui.hint("Radius of the brush - Wheel"); ui.input_float(*radius, w=64); ui.same_line(); ui.label("Radius");. There are ui.indent(); ... ui.unindent(); pairs for some visual hierarchy, but the indents are very subtle indeed. There’s a ui.enable(bool) for graying buttons out until a ui.enable(true);. The video shows how useful it can be to have video recordings of GUI interaction for debugging; at 43'33” a bug misinterprets a mouse movement dragging a window as also moving a slider, which mystifies Blow, and at 43'57” he erroneously speculates, “Must’ve accidentally dragged that, real fast?” At 45'16” he’s looking at another bug where a “clear” button isn’t being clipped properly and is overdrawing an accordion-control button in its parent. He gets into the implementation arount 54'44”. His definition of “em” is wrong by a factor of 2. He sure spends a lot of time manually doing small table layouts that a sort of elastic tabstops would solve for him. The implementation figures out when to pop up “hints” (tooltips) with rect := place_rect(w, h); over := is_over(rect); update_hint(over); and detects clicks with over && (ui.mouse_button_left_state & .START), and I think place_rect handles moving you to the next line and widening the current line. It’s interesting to hear him using Tk terminology like “entry” for “text field” in 02021. The RGBA color picker is interesting; I thought maybe you dragged up or down from R, G, B, and A buttons to adjust the respective color components, which changes the colors of the buttons to the corresponding primary shade, but in fact they’re just “checkbuttons” that change color when you click them. I like text_height, text_width := text_size(text);. Fading out a border around the window to α = 0 gives a nice cheap fuzzy-drop-shadow-like effect. I feel like for indentation some kind of current-drawing-origin stack might be a good complement to the clipping stack (“scissor stack”, maybe nomenclature borrowed from glScissor). He spends a lot of time debugging problems induced by how Jai’s static type system doesn’t have an Option type for optional parameter defaults. His defensiveness is grating: “The last thing I need is for someone who’s been programming for 5 years to tell me what I do and don’t know.” He’s hashing the addresses of callsites (plus an optional integer for loops) to get unique widget IDs for the IMGUI library. Casey #Muratori pops on at 2'56”, explaining that nowadays he streams his IMGUI drawing commands into a command buffer, sort of like ocornut’s dear-imgui, but higher level so he can run layout algorithms over it afterwards. “The reason I like the command buffer approach is because I like to be able to have more logic in the layout stuff.” Muratori’s definition: “IMGUI just means that you don’t call Create and Destroy on widgets. It means that there’s no need for you, the user, to like record what they are. (...) The core problem that you're trying to solve, and the one that determines whether I call it an IMGUI or not, is, can you just run some code on your side to output the current state of the UI, and you never have to think about whether some previous thing you said will make the UI, like, appear different, right? So you can just say, one pass, here’s what the UI should look like, and that is what the UI will look like.” Blow asks at 3h14m8s: “Was it Sean who used to do the IMGUIs where you would like call the function twice, once with display off and once on?” Muratori: “Yep.” Blow: “Did you ever do it that way?” Muratori: “I think I have played with doing it that way but I don't remember ever liking that.” At 3h19m55s Muratori explains how he did the React virtual-DOM diff and merge thing on his “command buffer” to draw an IMGUI with Qt, pointing out that you could do the same thing with HTML. Oh, at 3h45m50s there’s how scrollable sections work (though it has some bugs where scrollbars don’t show): ui_begin_scrollable_section(*results_scroll_value, w=..., h=...), with presumably a corresponding end call later. He has just a ui.selection_list inside it in that case, which turns out to be a loop calling ui.button for each item in the array which returns the index of the selected button. And I’m amused to see that ui.button is just a call to ui.checkbutton which passes a null pointer for the state, which ultimately calls draw_button with 8 positional parameters, which calls draw_label, which calls text_origin to figure out where to draw the text. Very educational video, even though I think some of the code is kind of naff, like ui_end(false, true). I managed to finish the whole video.
#video of roller/pinion #mechanisms patented in 02019 in Korea and China but denied in Taiwan.
on 02025-08-13another #video of #STM32 DMA, this time to onboard DACs on a 168MHz STM32F405RGTx. But the sampling rate is only 100ksps. #toread maybe.
on 02025-08-13#video by "simonmartin_ch" of how you can get #STM32 #microcontrollers such as an STM32f103rb running at 64MHz to DMA data from memory to a GPIO at 2MHz using a timer. Using STM32Cube tho. He sets bit 8 (UDE he says) in TIM2->DIER to make TIM2 generate DMA requests repeatedly. Also he’s using the TIM2 output compare signal itself as one of his output signals and using circular DMA mode. He says at 4MHz you get a lot of jitter, even with “High” priority (visible from 3’25"). A commenter “synergie8” warns that on STM32F2 and STM32F4 DMA1 can’t be used with GPIO, so you have to use DMA2 and consequently TIM1 or TIM8.
on 02025-08-13#video of Endoh’s #IOCCC winner, a raytracer written in the #C preprocessor.
on 02025-08-13#video from 02023 by Michael Hill (#bitfixer) of his "esp32s3vga" library, not really bitbanging VGA signals on ESP32-S3 #microcontrollers for a “new retro computer”, simulating an 8-bit CPU with 8 megs of SPI RAM. Actually it includes an RGB LCD driver peripheral that’s perfect for this, which can even use external PSRAM; he’s using a 25MHz dot clock with 640×480 because 25.175MHz wasn't stable, and 40MHz for 800×600. There’s a demo of playing 3-bit-per-pixel and 8-bit-per-pixel (R 3, G 3, B 2) video from an SD card in SPI mode. #retrocomputing
on 02025-08-13#Bitluni #video on how ESP32 #microcontrollers can #bitbang #NTSC and PAL color, including YUV equations, etc.
on 02025-08-13#video by #Bitluni of #bitbang #NTSC and PAL video signals from ESP32 #microcontrollers using I²S. Waveform animations showing the h-sync pulse, etc. Recommends watching CNLohr’s videos for color.
on 02025-08-13#video #toread #metrology #precision “Measuring the flatness of a surface with a laser and a webcam to microns over large surfaces” by removing the lens from the webcam.
on 02025-08-12#video by #Nighthawk on #tadelakt fabric by dunking soapy fabric in alum water to form an insoluble, hydrophobic polyvalent soap, which can nevertheless be wetted by a forceful spray of water. Also he tries dissolving paraffin in naphtha.
on 02025-08-12#news #humor #video of how 93% of #Trump #deportations are of people with no violent criminal record and 60% are of people without even a traffic ticket. #USA #politics
on 02025-08-12#news #video of #John-Mearsheimer saying NATO expansion provoked the Russian invasion of #Ukraine
on 02025-08-12#video #news about #South-Africa with 33.5% unemployment in the middle of last year. State-run monopoly Eskom cuts off power for load shedding roughly once a day to anywhere.
on 02025-08-12#CNLohr #video of an #ESP8266 generating a #bitbang #NTSC signal modulated to 61.25MHz so his TV can receive it. #toread #communications
on 02025-08-12#video on #CATL "Naxtra" #sodium-ion #batteries for #energy-storage at (rumored) US$10/kWh rather than Li-ion’s US$115/kWh. Also 175Wh/kg, compared to LFP Li-ion’s 185, though far below 250–300 for high-density non-LFP Li-ion batteries. The video is just talking heads and stock footage, though. #energy
on 02025-08-12#Posy’s 7-segment displays alternative #video, including the Kinsley patent from 01915 (US 1,126,641).
on 02025-08-12#video on pogo pins (50¢–100¢ each!) for programming a mass-production #electronics board without paying for a connector
on 02025-08-10#electronics #video by #Pocket-Concepts of an ATtiny45-based 2%-error ammeter board with an OLED display, showing how he fixed all the mistakes he made in the design, and how the I²C OLED display works. #hardware
on 02025-08-09#video on Nordic RF #communications #electronics that can feasibly run off some largish photodiodes used as solar cells. “Ultra low power energy harvester from BPW34. Super small and durable power supply for wireless nodes” on hackaday. Also “Solar-powered flashing LED heart pendant PCB coil” by bobricius in 02018. This guy, "Pocket Concepts", got 300mV out of his BPW34 photodiodes, and used it to transmit a temperature datum over #Bluetooth #BLE to his motherfucking phone. His #Nordic chip uses about 50μC of charge (over the 2.25V to 3.6V range) to run for the necessary 20ms, so he needed 37μF, which looks like maybe it’s a tantalum cap. It gets enough power from his fridge light to send a transmission every few seconds (so, say, 0.4% duty cycle, so he’s getting tens of microwatts). But a slightly larger amorphous cell is even better because it works even in a dimly lit room. #electronics #solar #photovoltaic #energy-harvesting
on 02025-08-09#bigclive #video dissecting NiMH and lithium AA cells; the NiMH one is mostly empty space in the middle! They’re largely punched metal mesh separated by electrolyte-soaked fibrous separator which looks a bit like thick paper, with lots of powdery paste smeared into the mesh (presumably largely depolarizer). The last battery, a Lidl NiMH cell, caught fire spontaneously as he was disassembling it, but not due to a short circuit; not only was it theoretically fully discharged, but the bits of mesh material that caught fire had no path to the other electrode. I guess it was a pyrophoric metal hydride cathode. Rapid deployment of the Explosion Containment Pie Dish prevents disaster. “There may be a delay between exposure to air and spontaneous combustion.” #hardware
on 02025-08-09#video of Jack #Rusher’s talk “Stop Writing Dead Programs” where he starts showing his Fortran program written on a keypunch for a VAX 11/780. Approvingly quotes #pushcx (Peter Bhat Harkins) on programmers perpetuating pointlessly hard nonsense.
on 02025-08-09#video of interviews on the #Russia street about the #Ukraine war
on 02025-08-09#news #video on #Trump #tariffs coming back into effect yesterday, in many cases over 30%. #USA GDP grew at annualized 3% during the second quarter. But the labor department revised its job growth numbers for May and June downwards by a large factor, like 6× or something. Mostly filler: talking heads and stock footage. From the #WSJ. #economics
on 02025-08-08Tim Hunkin gives a #video demonstration of how electrochemical fax machines using potassium ferricyanide worked. #history #electronics
on 02025-08-06#video on "C-Motive" electrostatic 1-horsepower #motors with a rotor made from 13 layers of PCBs with many poles, insulated with a dielectric fluid. For high-torque industrial applications like running conveyor belts.
on 02025-08-06#video #toread about a sparse implementation of Conway’s Game of Life #cellular-automata
on 02025-08-06#video of Jon #Blow’s presentation at Reboot Develop in 02017 about designing #Jai for #videogames. Photoshop takes 7 seconds to start up to display you an image, during which time it’s displaying you a high-resolution image on its splash screen that isn’t the one you wanted to see, and “now” in 02017 opening the File→New menu window takes an entire second. (Indeed, in this 30fps video, it takes 30 frames to finish drawing the menu.) On his i7-7700HQ. He says single-core performance had improved 24× since 02000 based on SPECfp, but it’s also quad-core. Demo of his in-progress Sokoban game, started a year earlier at the same time as Jai, starts at 16'36". Roughly 100kloc per second unoptimized compilation speed on the i7-7700HQ. A thing I hadn’t realized before is that his compile-time execution represents a repudiation of the idea of simple DSLs like the shell, which is consistent with his dislike of things like Lua. The video is unfortunately very hard to read his screen from. This is one of the videos where he says that the syntax is temporary. His reflection system is useful for not just compile-time computation but also run-time debug messages and experimental interfaces. He never mentions the name of the language, so maybe he hadn’t settled on “Jai” yet, but the compiler is already called “jai.exe” and the filenames end in “.jai”. Also he already had the #LLVM backend, which he described as the “short-term plan” for optimization. #compilers
on 02025-08-03#humor #video about American Eagle #ad #culture-war
on 02025-08-03#video of #Jaguar’s “copy nothing” 30-second spot #ad with no cars in it which apparently sparked a huge backlash from I guess people who hate gay people? Or maybe racists? Because the only thing I can see in this ad that would be controversial is that the people are androgynous and some of them are black. Top YouTube comment: “Jaguar’s pronouns are Was/Were.” Followed by: “This ad will be studied for centuries in universities as an example of what not to do in #marketing”. Other comments say, “I'm pretty sure this ad is the ultimate product of universities”, “Together with the ad that cost Bud Lite its No1 spot...”, and “More like “Hold my soy milk latte””, “DID THEY LEARN NOTHING FROM THE DYLAN MULVANEY FIASCO???”, “What do you think ultra luxury car buyers have in common with people who drink bud light?”, “I guess Jaguar identifies as bankrupt”, and “Its like the Jaguar advertisement team typed in the the words “color, gay, and gender” into an AI and then hit enter”. So it seems like it’s people who hate education and gay people. #culture-war
on 02025-08-03#video #interview with James Gosling where he attributes the #JVM’s design to having had PERQ workstations from Three Rivers when he was at CMU, which ran UCSD p-System Pascal bytecode, which Raj Reddy had him port to the VAX, which he did by compiling the bytecode to VAX assembly. And he also of course talked to Smalltalk people (1h39m30s). Mentions that CDC machines were one’s-complement. When he tried to explain that the #Java bytecode was a postorder serialization of the syntax tree, Lex Fridman didn’t know what he was talking about, so I guess he’s kind of a beginner programmer.
on 02025-07-30#CNLohr made this #video about #VRChat saying it has hundreds of thousands of users and that it allows users to express themselves to a “prodigious degree” with their avatars including custom shaders. People sell avatars (?) and things for making them on the Unity asset store. There’s a chess engine that runs as a shader on an avatar. Also English-to-Japanese #AI #neural-networks. His mother is VRChat user marylohr. Very colorful video #formina.
on 02025-07-30#video by physics YouTuber Angela Collier about reading everything about #Feynman #history because she always had really bad experiences with his fan club. She’s a big fan of his approach to teaching and his willingness to teach people, and his Challenger Commission work, and his kindness to children, but doesn’t like how he treated women or how he was so contrarian. Except actually he supported gender equality for Jenijoy La Belle in her lawsuit and also helped his sister Joan to become a physicist and sought out intimate relationships with women he could have intelligent conversations with, so maybe the ill-treatment of women was exaggerated in Leighton’s books? But in the divorce from Mary Lou he was accused of physically attacking and choking her.
on 02025-07-30#CNLohr #video explaining how he built a no-MMU Linux with #buildroot for his #RISC-V emulator. Gives debugging tips, like how to test your buildroot-built system image in QEMU, and how execution starts at the first byte of the image. Includes a Make #tutorial. Reveals that his name is Charles Lohr.
on 02025-07-30#video #interview with #Carmack about how he likes debuggers, IDEs (Visual Studio), asserts, and especially static checkers, and favoring arbitrary limits on collection sizes to keep unintentionally quadratic code under control. Also he’s using triple monitors now after years of dual monitors. But no fancy keyboard or mouse. Describes a week-long “retreat” using just vi as his “Civil War reenactment phase”.
on 02025-07-26#video by a guy who moved from #Microsoft Windows to Linux a year ago and has found it boring and predictable and easy to use. The video is 100% talking-head filler occasionally overlaid with meme images or intercut with stock footage.
on 02025-07-25#Thailand attacked #Cambodia today. #news #video #toread
on 02025-07-24#video #toread near-one-hour documentary about #Blow’s The Witness
on 02025-07-24#video #toread of Matt Godbolt on what programmers should know about how CPUs work
on 02025-07-23#video of Jon #Blow talking to the camera about what computer science #pedagogy should and shouldn’t teach.
on 02025-07-23#video #interview with #DHH on the launch of their Hey email app where they went head-to-head with #Apple over their 30% revenue cut. Says everyone owes an immense debt of gratitude to #Epic Megagames for fighting Apple on this.
on 02025-07-23Geoff #Pullum recorded a #video series on the #English #passive-voice. #linguistics
on 02025-07-20#video #interview with Jon Blow for three hours about mindfulness meditation, VR, the nature of the universe, whether free will exists, Braid, The Witness, the nature of art, what art is worth making, Stephen Wolfram, AI voice acting in games, Unreal Nanite, John Carmack in the history of 3D #videogames. Henri-Louis Bergson, contact improv, the nature of the videogame medium, etc. He says games are worse at storytelling than the traditional storytelling media. Also, “Thinking is not what makes you conscious. Thinking is what you’re conscious of.” He also mentions that he has aphantasia, or almost. He agrees “with Peter Thiel about the general state of things”, but thinks he’s “a little too charitable” because he doesn’t realize software stopped advancing in 01990. September 28, 02021, they were still working 100% remote because of covid.
on 02025-07-14possibly better #video #toread of the Lambdaconf demo of Jon Blow’s language #Jai, video from yesterday, demo from May.
on 02025-07-10#video of the Lambdaconf demo of Jon Blow’s language #Jai, video from yesterday, demo from May. Totally screwed up audio/video rates.
on 02025-07-10#video #news #humor on #Trump’s “one big beautiful bill” which cut US$930 billion from Medicaid, US$488 billion from clean energy, US$285 billion from something called SNAP, raised the debt ceiling by US$5000B, and added US$157B to the military. It’s anticipated to increase the deficit by US$3400B—by 02034, so US$340B per year, because it also had US$4500B (per year?!) in tax cuts.
on 02025-07-09#video of Asmongold calling for censorship and preemptive detention in response to killings of ICE agents. “You just find the people that are expressing violent rhetoric and then you put them in jail.” #USA #politics
on 02025-07-09#video of AMD EPYC 9005 Turin Zen 5c #hardware with 384 cores per socket, 2 sockets, 24 DIMM slots
on 02025-07-09#video of John #Carmack saying video games, even Atari, are nowhere close to being solved by #neural-networks yet, which is why he’s doing Keen Technologies. They’re going to open-source their RL agent! Which they’re demoing playing an Atari 2600 (emulated on a Raspberry Pi) with an Atari 2600 joystick and servos (“Robotroller”), running on just a gamer laptop with a 4090. (No video of the demo, though, just talking head and slides.) He says now he’s using PyTorch just like anyone else instead of implementing his own matrix multiplies. Mentions that the Atari screen is 160×210, which I’d forgotten. They’re using April-tag fiducials so their camera can find the screen, but patch them into the video feed instead of trying to get the lighting right for stickers. He says the motion-to-photons #latency at Oculus had to be below 20ms for avoiding nausea (26'58"). Finding the Atari scores on the screen was surprisingly hard. #retrocomputing #AI
on 02025-07-09#Veritasium #video on #Braess’s paradox
on 02025-07-02#video on #electroplating #3D-printing in “PVB” and smoothing with isopropanol
on 02025-07-02tawr recommends this #manufacturing #video #toread with a yellow crayon Dykem alternative, from NIMI, “another skill-enhancing practical training video tailored for the ITI ecosystem and the vocational education community!”. He says, “the production quality is out of this world.”
on 02025-07-01#video #toread on sleeping in your self-storage unit #stealthcamping
on 02025-06-29#video by “Rob the Nomad” about surviving homeless long-term. “This type of lifestyle is no joke.” Recommends a tent because bugs never stop coming. Getting wet or dirty in the winter is a serious problem if you don’t have heat. Things that get wet don’t dry out without heat. “It’s a nightmare out here. It’s not fun at all.” He says he just sits around and doesn’t do things because there’s nothing to do. He seems like he’s maybe suffering from depression. His tent is lined with cheap “fleece” blankets to keep the cold out. Lining the tent with aluminized reflective blankets creates condensation, which is very dangerous. #bushcraft #stealthcamping
on 02025-06-29#humor #music #video of “Hillbilly Vikings”
on 02025-06-28another AI slop #music #video #toread
on 02025-06-28#humor #music #video of an obscene neural-network-generated song from “Mischievous Melodies” #toread
on 02025-06-28#humor #music #video of an obscene neural-network-generated song from “sus records” #toread
on 02025-06-28#video of wind tunnel tests for falling coins to estimate the risk of Australian terrorists throwing coins at Americans off the tops of skyscrapers. Shows his really tiny pianist. Instead of using ballistic gelatin, he buys a pig head to slingshot coins at, then throws coins off the top of a dam.
on 02025-06-22#video of #TheBackyardScientist cutting down trees with a laser rust cleaner. Also welding, cutting metal, vaporizing a hole through a brick, and removing the ink from a dollar bill.
on 02025-06-22#video #toread on #DIY fluidized-bed powder coating #manufacturing
on 02025-06-22#video #toread by #Breaking-Taps on laser scanning #microscopy
on 02025-06-22#video on Dinospiders in the Colombian rain forest. Calmly confronts getting potentially bitten by snakes, etc.
on 02025-06-17#video reporting on experiments heating widely-available Robax glass-ceramic #materials to 994° for 10' to reduce their CTE from -0.6ppm/° to -0.058ppm/°, or much lower in the range 20°–25°, better than Schott Class 2 Zerodur, but much worse than Class 0 Extreme Zerodur. Ceran, a different glass-ceramic, is nearly as good when similarly converted at 961°.
on 02025-06-17#video on the lunar lander #Resilience, which died because the laser rangefinders it was relying on experienced unexpected #latency. #space
on 02025-06-17#video by #Hyperspace-Pirate on #bootstrapping ozone #materials with corona discharge instead of brown nitrogen dioxide with thermal plasma arcs. A Leyden-jar sort of arrangement with water on the inside and a mesh on the outside seemed to work well, and then he switched to just using test tubes filled with water to keep arcs from burning through the glass. But what he really wanted were nitrates, and the Birkeland–Eyde process is 40 times more efficient. “So, anyway, that’s the fun world of ozone. It smells terrible and I hate it. Bye.”
on 02025-06-17#Integza #bootstrapping rocket propeller #video
on 02025-06-17#Steve-Mould #video on Doebereiner’s catalytic lamp, governing the emission of hydrogen from sulfuric acid on zinc with negative feedback, then catalytically burning the hydrogen on hydrogen sponge.
on 02025-06-17#video from a month ago saying lithium iron phosphate #lithium-ion #batteries had fallen in #pricing in December to US$115/kWh (US$32/MJ), quoting BloombergNEF. Says raw materials are 70% of batteries’ cost [citation needed], and that LFPs have #energy-density of 90–160Wh/kg (320–580kJ/kg), much worse than NCA (230–260Wh/kg) or NMC (250–320Wh/kg), citing a page on batterydesign.net. #energy
on 02025-06-17pro-#China propaganda #video trying to persuade foreigner entrepreneurs to move there to start companies #toread
on 02025-06-17#StrangeParts Scotty got inside the Anker eufy Make factory in Shenzhen! Where the "eufy Make" UV printer E1 is made, which makes full-color, full-texture prints. Because of the dragon and stickers this is #formina. Actually it’s a whole series of factories, including the Luxshare final assembly factory. Holy shit, they actually let him work on the assembly line. He explains that they’re going to rape you on the “ink” by “authenticating” the ink cartridges. #video
on 02025-06-17The International Firestop Council: #video on intumescent firestop #materials. #safety
on 02025-06-17#video from May 19: #interview with #drones developer Sergey Tovkach from #Russia on how #weaponry from #Ukraine is far better than what the US and even China have, and now 70% of fatalities on the battlefield are from drones. “A special thanks to our Western partners, because where else could we have trained on so much of your equipment? You delivered it straight to the front, and we got to study it up close. We learned all the weak points. We learned exactly where to strike. (...) There isn’t a single Western drone that’s proven itself effective in this conflict.” He claims #China makes military gear that doesn’t survive being tossed out of a truck, “like toys”. Ukraine barely uses Chinese chips in their drones, but Russia’s have to be all Chinese. Talks about mine-laying drones (“in use for about a year and a half now”), “sleeper/ambush drones” (same time frame, Ukrainians first — drones playing possum, pretending to be “a real trophy”), and drones dropping caltrops welded from rebar. “Same [ambush tactics] with drones placed on rooftops or hilltops overlooking roads (...) when the vehicles come, the drone just takes off, flies a short distance, and hits its target. That whole tactic really took off with the rise of fiber optic drones,” because they don’t need to burn 5–10W to transmit the video feed. Russian operators now wind up used fiber-optic cables on a cordless drill to avoid giving away their position. “The Orbit [Russian remote piloting] system. (...) The Ukrainians have been using radio relays and internet bridges for a long time already. (...) #Starlink is the holy grail. (...) Take away Starlink and Ukraine’s entire fleet of naval drones disappears overnight. (...) Why doesn’t Russia have naval drones? Well, we do have the boats and, but we don’t have Starlink.” But he says Starlink’s #latency is too high for FPV drone piloting. Baba Yaga or “Vampire” drones dropping antitank mines with 6–8kg of TNT have been very effective; Russia is ramping up two factories to produce its own equivalent.
on 02025-06-17#video #toread about #circuit-sculpture and #manufacturing wires from raw metal by pulling them through a tungsten carbide drawplate, and twisting square wires, etc., using parts recycled from #hoarding, to make a landscape with trees.
on 02025-06-17#video #toread on Eirik Brandal’s wall-hanging #electronics sculpture "várhafsóll". Not quite #free-form electronics, because it’s all built on a transparent acrylic base, but does have lots of point-to-point wiring with brass rods. At one point you can see he’s soldering diodes to some pins of a CD4051. #circuit-sculpture
on 02025-06-17#video on #manufacturing #electronics without PCBs, using point-to-point wiring with thick copper wires in free air. Peter Vogel’s “#Free-form electronics”. An annoying amount of talking-head filler. Mentions Vbugs and other #BEAM-robots and shows Eirik Brandal’s audio and kinetic sculpture work and MohitBhoite’s work. He’s using 800μm brass rod mostly and 1500μm brass tubing. He likes to build his circuits on a piece of graph paper glued to a board rather than up in the air, sometimes holding things in place with modeling clay, or rather Blu-Tack. At one point he adds a structural small-value capacitor between some unrelated brass-rod nets to increase rigidity. Unfortunately he made the time for the talking-head filler at the beginning of the video by omitting most of the circuit build from the end. #circuit-sculpture
on 02025-06-17#video lecture #toread about #switched-reluctance #motors #hardware
on 02025-06-17#video #toread about #DIY building #switched-reluctance #motors #hardware
on 02025-06-17another #video #toread about #switched-reluctance #motors #hardware
on 02025-06-17#video #toread about magnetic field theory in #switched-reluctance #motors #hardware
on 02025-06-1735-minute lecture (so-called “webinar”) #video #toread about #switched-reluctance #motors design. #hardware
on 02025-06-17#video #toread about #switched-reluctance #motors #hardware, #SynRM demonstration
on 02025-06-17Hour-long #video #toread about #switched-reluctance (?) reluctance synchronous #motors. #hardware
on 02025-06-17Lecture #video #toread about #switched-reluctance (?) reluctance synchronous rotor design. #hardware #motors
on 02025-06-17Lecture #video #toread about #switched-reluctance (?) reluctance synchronous rotor theory. #hardware #motors
on 02025-06-17#manufacturing #3D-printing #video by #Sanladerer on including formable ribs or ridges running the length of 3-D printed plastic holes as “self-forming threads” to allow M3 machine screws to reliably form threads in them, contrasting with other options like heat-set inserts, “prong nuts”, and inserted hex or square nuts.
on 02025-06-16#video of #bootstrapping a #CNC mill under AU$500 with a focus on rigidity and a small footprint with #3D-printing, using a non-gantry design to improve rigidity. A steel Allthread skeleton is wrapped in 3-D printed forms for the concrete, PLA with seams sealed with superglue. I don’t really understand how the threaded inserts in the concrete work; maybe the screw presses the 3-D printed plastic out against the concrete walls? He uses a vibrating sander as his vibrator for the concrete pour; after initial one-hour set, scraping with a spatula removes excess concrete. He says “non-gantry” but he’s using two sets of two parallel linear rails for the X and Y axes; it’s just that he’s moving the workpiece with anti-backlash-spring-loaded leadscrews rather than the toolhead. He’s also just using NEMA 17 steppers instead of real servos. #manufacturing
on 02025-06-16#video of an hour of instrumental rock #music on piano, starting with “Nothing Else Matters”, then “Listen to Your Heart”, “Du Hast”, “Zombie”, “The Unforgiven”, “Over the Hills and Far Away”, “Smoke on the Water”, “In the End”, “Eye of the Tiger”, etc.
on 02025-06-16#video on marginally literate fugitive child abuser Jeremiah Button’s hidden cabin “bunker”, showing the bike generator. The hunter who found him, who looks a bit autistic, followed his tracks in the snow because he thought it was suspicious that someone was trying to cover his tracks. #homeless #DIY
on 02025-06-14#video on #homeless people living under a bridge in Concord, CA (Contra Costa County), getting a 72-hour notice to leave because one of them built a loft under the bridge.
on 02025-06-14#video on Milwaukee #homeless person “Bunkerman” Geoffrey Graff, “this eccentric character who lived in a hole by the river,” who built a subterranean bunker with a bit of an armory, and lived in it in the forest for more than ten years; initially he was charged with some kind of crimes (maybe because he fired his gun into the river), but the charges were all dropped. #DIY
on 02025-06-14#video on fugitive child abuser Jeremiah Button’s hidden cabin “bunker” in the woods in Marathon County 30 miles from Wausau, where he survived for 3 years, dug into the hillside and concealed by underbrush, using stuff from the landfill. Electricity, a water filtration system. Quite crowded; lots of stuff hung from the ceiling. Muffin fans circulate the air. Three car batteries stored electrical energy from a bike generator and solar panels on the grassy roof (also from the landfill‽). Some storage is in jars with their lids screwed to the ceiling with two screws each. Plastic storage drawer units provided abundant storage. “He vanished two weeks before the jury trial” while out on bail. A hunter found it, but apparently not due to the panels — he just pushed the door open. Unlike the North Pond Hermit, he’d been spotted previously by the same hunter. #homeless #DIY
on 02025-06-14#Nighthawk #video on waterproofing and stiffening #cardboard by brushing on 500mℓ isopropanol, 125g shellac, 15g beeswax (emulsified), 2g metal stearate (slowly stirred on low heat on an electric burner outdoors). Also demonstrates a totally game changing edge-sealing technique where you cut halfway through the cardboard to isolate one side, then fold it over. Also you can stiffen the surface with wheat paste. And maybe pasting on extra layers of newspaper or paper bags. Also, you can edge-splice panels with the same cut-halfway-through technique and then pasting the sides thus isolated. He also touts his waterproofing mix as a way to make fabric waterproof, showing some very impressive demo video. His second waterproofing recipe is 100g EVA hot glue diluted with 25g paraffin wax and 20mℓ mineral oil. He also demonstrates homemade lampblack with a vegetable oil candle under an aluminum tray for UV protection, but thinks calcium stearate might work well enough for UV protection, which is his reason for including it; he recommends reacting soluble sodium stearate (made from stearic acid and lye) in water with sulfate of aluminum, zinc, or magnesium, or muriate of lime, to form the insoluble metal stearate. Doesn’t contain his usual total mangling of the science. #DIY #bootstrapping #materials
on 02025-06-14#Vice #video on #homeless people living in the desert near Lancaster, California. #toread
on 02025-06-13#video documentary on “The Hobbits of Texas”, a parallel society of #homeless people living in the woods in Austin, which the cinematographer "Glink" met when they were having a hobo jam session in a tent.
on 02025-06-13#video about Christopher Thomas Knight’s 27 years as “The North Pond Hermit” #bushcraft #toread #homeless
on 02025-06-13#video o Kap Te’o Tafiti demonstrating Samoan fire dancing and culture at TEDx, demonstrating #firestarting with the fireplow method. He's able to get smoke in 5 seconds and finishes his ember in 15 seconds using hibiscus wood. He points out that Sanskrit “Agni” is very plausibly etymologically related to Samoan/Tongan “afi” “fire”, Hawai’ian “ahi”, and Malaysian/Indonesian “api”. Licks fire off his flaming sword. #Polynesian
on 02025-06-13#bushcraft #video on Kap Tafiti #firestarting with the fireplow technique, Samoan style, from “PolynesianCulturalCenter” with hibiscus wood and coir tinder.
on 02025-06-13#bootstrapping #bushcraft #video #firestarting with a standing dead snag, split into kindling with an axe and then shaved into a feather stick for tinder, then using ferrocerium to ignite the feather stick. #DIY
on 02025-06-13#bushcraft #video with #firestarting using a log to weight the bow drill. Uses a saw to cut the notches in his hearthboard. #bootstrapping #DIY
on 02025-06-13#video on #bushcraft myths (widely believed falsehoods), showing among other things the use of a tree trunk as a weight to put pressure on a bow drill for #firestarting. Also demonstrates using a sandwich bag full of water for firestarting. But the video is mostly about safe berry foraging. #bootstrapping
on 02025-06-13#video on 13 #firestarting techniques: rubbing a roll of ash inside a cotton ball between two boards, spontaneous combustion of “boiled” linseed oil (two hours of oily rags in a cardboard box on a cold day started to smoke, then burst into flames at 4h25m), steel wool and 9V batteries (or 3 AAs), a firepiston, KMnO₄ and glycerin, ferrocerium rods (with cotton balls, steel wool, jute twine, or magnesium shavings), fire-plow style (at which he fails), fire-saw style with bamboo (sort of an inverted fireplow) at which he also failed, beating steel on an anvil with a hammer until red-hot, a flashlight reflector as a non-imaging optical concentrator on charcloth, a bow drill (commercially sold with ball bearings, or improvised with paracord, which failed), and finally a hand drill, which he didn’t even really try. And then a rope lighter, which is like a cigarette lighter that uses rope for fuel. #DIY #bootstrapping #bushcraft
on 02025-06-13#stealthcamping #vanlife #video #toread about making a side window “invisible”. He’s covering it up with one of those stupid bus wrap grilles (“vinyl privacy window film adhesive glass wrap roll”). I think you’d have to darken the paint of the rest of the van to make it really work. Mostly tips on using the power tools.
on 02025-06-13#video saying #pepper-spray for bear attacks was without human injury in 98% of cases and was effective in 92% of cases, while handguns were only effective in 84% of cases, and long guns in 76% of cases.
on 02025-06-13#firestarting #video by #CrazyRussianHacker using the fire-plow method. #DIY #bootstrapping #bushcraft
on 02025-06-13#firestarting #video where a Scotsman struggles greatly with hand drills. After many attempts with a bow drill made with his shoelace, he gets embers, which go out. Finally, after 8 hours of attempts spread over 6 days, he is able to start a fire, a feat he is then able to replicate on the beach later. #DIY #bootstrapping
on 02025-06-1325-minute #WIRED #video on #firestarting by an anthropology professor using hand drills or bow drills, with a notched hearthboard with a divot, and a spindle. He recommends using bone-dry wood, and not using a resinous wood for the hearthboard, nor anything that’s too hard, something you can dent with your fingernail, like basswood or tulip poplar or (contradictorily) cedar. For the spindle he suggests cattail, horseweed, mullein, or goldenrod, because it needs to be straight and also somewhat soft. He suggests splitting a stick to make the hearthboard, either twice, or once while shaving down the back. He likes cedar inner bark for tinder, and he uses birchbark under the notch to catch the ember. He breaks the spindle. “Son of a bitch.” He spits on hands to improve friction with the spindle. Looks exactly like Primitive Technology’s technique, except that he uses a tiny stick to remove the hearthboard safely from the ember without breaking it. The cinematography (cuts between spindle changes, etc.) greatly interferes with seeing the technique clearly. For natural fibers for a bow drill, he suggests dogbane, but prefers brain-tanned deerhide. #DIY #bootstrapping #bushcraft
on 02025-06-13#TKOR #video on #firestarting by rubbing sticks together, linearly, fire-plow style. Not very convincing but he claims to have made it work. #DIY #bootstrapping #bushcraft
on 02025-06-13#retrocomputing #history #video about how in the 5-bit ILLIAC-I character code the characters following 0123456789 were KSNJFL, so those were used for sexadecimal.
on 02025-06-12#video of how Rhode Island artist Michael Townsend and 7 accomplices built a secret apartment inside local shopping mall Providence Place for four years starting in 02003, including 3 tonnes of cinder blocks to build a wall inside; subject of Jeremy Workman’s new documentary Sweet Mall Apartment made from 25 hours of video footage they shot on a tiny digital camera at the time.
on 02025-06-12#vanlife #video by Nomad Brad living in his work van (a converted U-Haul truck) in a Home Depot parking lot. Not very #stealthcamping because it has tinted windows on the sides and an air-conditioner condenser sticking off the back, wood siding and a residential-sized door on the back, and visible solar panels on top, and it also advertises his services as a solar installer for vans and RVs on the sides. He does seem to have a door between the cab and the box, but he doesn’t use it. Brief demonstration of installing a kilowatt of PV on the roof of a trailer for a client. Separation toilet, small fridge, induction cooktop, espresso machine, 1200W of #solar #PV on the roof, 5100Wh of LFP batteries, a 3kW Sungold inverter, etc. He also has a portable “power station” for use on the job site. He spends the next night in the parking lot of a Planet Fitness gym, where he showers.
on 02025-06-12latest #Primitive-Technology #video on “belt and pulley blower” covers bark twine, leaf-fiber-reinforced dried clay, crushed-ceramic grog, clay bats, etc. Dried-clay pulleys break, unsurprisingly, even with crushed-leaf reinforcement, but do work for a while. 17-warp larger cane wicker pulley doesn’t break. Wood stake frames lashed with bark. Split-stick crank clamps shaft. He sets up a wicker “floating wheel” which permits his twine belt to fan the fire somewhat higher. #ceramics #DIY #bootstrapping
on 02025-06-12#humor #video of wholesome influencer Uncle Goose from China visiting the US with a Chinese English translator Brian, who is famous for imitating #Trump
on 02025-06-12#humor #video of #Tony from #LC-Sign imitating #Trump, among other things
on 02025-06-12#Chinese numbers listening practice #video, numbers 1-99. #toread
on 02025-06-12#Chinese numbers listening practice #video, numbers 111-999. #toread
on 02025-06-12#video on #mechanisms with unreasonable gear ratios so a tiny little DC motor can lift you
on 02025-06-11#video on soldier tips from Ukraine that sound stupid: taping up metal things, not using Face ID, closing one eye for a few minutes before going into the dark, removing batteries from flashlights, scanning right to left, dirtying gear, using a green notebook, freezing instead of fleeing, not looking up with your face uncovered, carrying paracord, improvising a tracheotomy, counting footsteps, leaving your boots untied, dirtying your gear, etc.
on 02025-06-11#humor #video on tricking wine critics into drinking (and liking) prison hooch.
on 02025-06-11#video by #Segerman about expanding racks, an expanding truss made out of telescoping rack-and-pinion #mechanisms. For varying speeds of expansion in different parts of the truss, he can use different numbers of racks, or he can use proportionally different sizes of pinions (making the teeth of the gears larger or smaller).
on 02025-06-11#video by #Destin on #manufacturing in the #USA, quoting Tim Cook on how the reason companies go to #China is for the skills. So he bought two used CNC machines and learned enough about injection molding to make working dies on them. His chainmail from India turned out to actually be from China. #toread
on 02025-06-08#video with lots of footage of arc-flash safety testing
on 02025-06-05#video on how electrician #Eddie-Adams died from a 2300V arc flash accident in Elkin, North Carolina, running through the plant while his burning flesh dripped off his bones. “(...) was working in an oriented strand board mill in Elkin NC, when a 2300V starter went down. He went to check it with a 1000V digital multimeter despite warnings, causing an arc flash that exploded in his face. He then ran through the mill while on fire. Story told by his coworkers and managers.”
on 02025-06-05#video by #Not-an-Engineer about #bootstrapping #CNC #manufacturing. About half talking-head filler. #toread
on 02025-05-29#Applied-Science #video on #bootstrapping “insanely powerful” planetary ball mill grinder to make α'' iron nitride filled epoxy for magnets, which did work somewhat; he tested it in a 1.6-tesla vibrating sample magnetometer he built using a lock-in amplifier to plot its B–H curve.
on 02025-05-28#machining #video recommending not using cast iron from weights because it’s too porous and falls apart when you try to machine fine threads in it.
on 02025-05-28#Titans-of-CNC #video about #autism in #machining, promoting Spartan-CNC.com. Turns out Titan Gilroy’s son is diagnosed with Asperger’s.
on 02025-05-28#EEVblog #video #toread on constant-current sources. #electronics
on 02025-05-28#video on a conference presentation on the “state of libre graphics” including a new “boring” #file-format for #fonts.
on 02025-05-28#video on #woodworking hacks, mostly jigs for cutting.
on 02025-05-28#video of an IBM Selectric II typewriter serial terminal being used to log into Linux, run ChatGPT, and caption what someone is saying with #LiveCaptions. Apparently adding serial I/O to Selectrics was a common thing to do back in the 01970s.
on 02025-05-28#video by #NurdRage on the keychain-based radioisotope photovoltaic generator, extracting tritium vials from plastic keychains and using a Soxhlet extractor to remove the plastic encapsulation with dichloromethane, then removing the silicone from the ends with concentrated sulfuric acid. He put 14 of the glass vials side by side, totaling about 100mm with maybe 60mm length, sandwiching them between two amorphous silicon solar panels of that size with clear plastic tape. Open-circuit voltage 1.9 volts per panel, but only on the order of a microamp (per panel) short-circuit current. He put it in series with a 1MΩ current-sense resistor to measure the current more exactly, reduced to 893kΩ by the parallel impedance of his voltmeter, so he could measure the current accurately; short-circuit current was about 900nA, and the maximum power point was about 1.65 volts and 600nA, thus almost 1000nW, 1μW. With the second PV cell this increases to 1.23μW. The more sensitive circuit increased the measured open-circuit voltage to about 2.02V. Results with a monocrystalline cell peaked at 71nW at 70mV (when scaled up to the size of the amorphous panel) due to the cell’s poor suitability for low-light generation. #electronics #hardware #energy
on 02025-05-22#humor #video of #Italian-Brainrot anime ending
on 02025-05-21#humor #video of hypothetical #Italian-Brainrot products
on 02025-05-21#humor #video explaining #Italian-Brainrot with English translation
on 02025-05-21#video #toread on #stealth-camping in the #vanlife asbestos removal van at a train station.
on 02025-05-20#video playlist #toread on the ultimate #stealth-camping #vanlife asbestos removal van.
on 02025-05-20#video on ultimate #stealth-camping #vanlife with an “Asbestos Removal” Vauxhall Vivaro CDTI van with a very subtle 200W #solar panel and a skylight camouflaged by a roof rack with a ladder. The wooden bulkhead between the van compartment and the driver compartment, covered in carpet affixed with spray adhesive, has a hidden bifold door in it. His diesel heater exhaust pipe, installed under the driver’s seat, hangs down under the van to avoid conspicuous wall chimneys. He uses a portable “power station” from “Bluetti” for the electrical part, installed protruding through the bulkhead behind the passenger seat. The convertible bed/couches are CNC-routed from 19mm (?) plywood by Contour Campervan Furniture. Electric 12V Yeti fridge, Dometic two-burner gas stove fed from a tiny Coleman camping propane/butane cylinder. Total cost, including van purchase, £11350, of which £6850 is the conversion cost. The toilet looks to be a Porta Potti brand cartridge toilet stored under the bed. He used very small CCTV surveillance cameras painted black on the sides of the roof rack so they wouldn’t be noticeable.
on 02025-05-20#video #news #interview with Patrick McGee on his anti-#China book “Apple in China”
on 02025-05-20#video #toread on #Superwood #bulletproof-wood at a trade show.
on 02025-05-20#news #video in Spanish on Mennonites in #Argentina #toread from #Deutsche-Welle
on 02025-05-19#humor #news #video chronicling #Trump’s crackdown on freedom of speech and journalism. #human-rights #politics #USA
on 02025-05-19#TED #video of Eric Schmidt of #Google talking about #AI and #neural-networks, saying it’s underhyped; he thinks superintelligence taking over the world is five years away.
on 02025-05-15#news #video #toread about the tragic demise of the Hövding airbag bicycle helmet
on 02025-05-15#news #video about #Proud-Boys and #politics in #USA, with Lincoln Heights arming citizens in response to about ten Klansmen putting up a banner over the freeway when #Trump was inaugurated, until the police hauled them off in a van (but didn’t arrest them). Also the Socialist Rifle Association.
on 02025-05-15#news #video #toread from #Deutsche-Welle about #Mennonites in #Argentina (42')
on 02025-05-15#news #video from a week ago about #narcosubs in Galicia, saying three have been found but maybe 30 got through since the first one was found in 02019, saying thermal imaging cameras are among the best tools for detection; mentions “unmanned #drones” in a possible future.
on 02025-05-15#news #video #toread about #China building floating piers, perhaps to invade #Taiwan using roll-on roll-off ferries for heavy equipment transport without needing to capture a port first
on 02025-05-15#news #video from 2 days ago saying #USA drops #tariffs on #China to 30% for 90 days #toread
on 02025-05-15#vanlife #video of a couple who is currently parked half a block from here on our sidewalk, Hugo, Gaby, and their shaggy brown dog Yacú, from Junín de los Andes. Their Mercedes had clutch trouble on the fourth day. They have 131 followers on YouTube and 309 on Instagram, where they’ve been posting more recently.
on 02025-05-11#humor #video of #Xiaoma speaking Generation Alpha
on 02025-05-08#video on Guai Ge, the Zhang Ya Wu Zhao star of TikTok who screams “Ao Li Gei!”
on 02025-05-08#humor #video about how great Spanish is
on 02025-05-08#SCMP #news #video on #Xi (#China premier) visiting #Russia to meet with Vladimir #Putin today, for the third time this year. #politics
on 02025-05-08#news #video on #China policy on #tariffs from the #SCMP; apparently the vice premier is going to Switzerland to have talks with #Trump officials in a few days, and there’s a lot of monetary easing on the part of the central bank. #politics
on 02025-05-08#news #video saying world stocks have recovered back to their level of a month ago when #Trump announced his #USA #tariffs
on 02025-05-04#news #video by Sal #Mercogliano, who specializes in maritime shipping, saying that the currently-starting week’s drop in shipping at the Port of LA is only 24% rather than 35% as expected, with smaller year-on-year drops of 13% for each of the following two weeks. Excerpts from the Bloomberg Surveillance #interview with Gene Seroka of the Port of LA. He mentions that #tariffs are affixed based on the date that cargo is loaded in #China unless you move your cargo off the terminal to a “bonded warehouse” (which allows you to pay the tariff at the time that you take it out of the warehouse) or ship it back to China.
on 02025-05-04#news #video about #human-rights in #USA under #Trump including his attacks on #Harvard and the court rulings against #deportations
on 02025-05-04#news #interview #video with Jeffrey Sachs about how #China doesn’t have “overcapacity” but rather insufficient capacity to fight #climate-change
on 02025-05-04#human-rights #news #video on #Trump #deportations; Mohsen Mahdawi has been released on bail. #Interview with Farber.
on 02025-05-03#news #interview #video with #MercadoLibre CEO claiming they have US$21 billion of revenues, 50% growth year-on-year (!!), and almost 100,000 employees. “I think it’s fair to say that the [#USA] was the country with the lowest #tariffs [anywhere], and [that] became unsustainable.”
on 02025-05-03#news #interview #video with Jeffrey Sachs claiming #China isn’t imperialist
on 02025-05-03#news #video by Sal #Mercogliano, who specializes in maritime shipping, saying that he thinks next week’s 35% drop in shipping at the port of LA (first full week of May) is real and indicative of a broader trend of less container ships arriving in #USA, which will hit the East Coast 2–4 weeks later. He recommends the US Bureau of Transportation Statistics website. #tariffs
on 02025-05-02#news #video from #Deutsche-Welle citing the University of Gothenburg “V-Dem Democracy Report 2025” saying 72% of the world lives in autocracies, with only 24 remaining liberal democracies.
on 02025-05-02#CNBC #news #video with Brad Setser, Senior Fellow at the Council on Foreign Relations, saying, “If #China really wanted to play nasty, they could say, ‘We’re going to limit exports of iPhones.’” The video is pure talking-head and stock-footage filler crap. #USA #politics #tariffs
on 02025-05-02#video about #China cowboy "Bigtooth" #humor videos on Douyin and TikTok
on 02025-05-01#video #humor legos of #Italian-Brainrot
on 02025-05-01#video #humor #music #Italian-Brainrot
on 02025-05-01#video #humor #music #politics of a rap satire song with #Elmu, #Trump, Sam Altman, etc.
on 02025-05-01superhero #humor #music #video of #Trump #politics in anime style
on 02025-05-01#video #humor #music of many #Italian-Brainrot animals, including Lirili Larila
on 02025-05-01#video #humor #music of Ballerina Cappuccina and Cappuccino Assasino #Italian-Brainrot
on 02025-05-01#video of #Italian-Brainrot animals in a #Minecraft mod
on 02025-05-01#news #humor #video #music of #Trump, Putin, etc. #politics
on 02025-05-01#news #video #interview with Tulsi Gabbard explaining how the use of Signal was authorized
on 02025-04-30#humor #video about how #English is illogical with country names #humor
on 02025-04-30#video by ultra-right-wing ideologue #Eric-Weinstein, who invented the “intellectual dark web”, promoting, among other things, his conspiracy theory that physics has been deliberately nerfed for 50 years
on 02025-04-30#video by #Veritasium on welded rail with thermite in railways
on 02025-04-30#news #video from six months ago saying the Coast Guard of the People’s Republic of #China is using laser weapons against Philippine sailors resupplying the Sierra Madre
on 02025-04-30#Palmer-Luckey just did a #TED talk #video on #Anduril
on 02025-04-30#news #video #finance #USA GDP dropped at annualized 0.3% in 1Q25.
on 02025-04-30#news #video largest container port in Western Hemisphere, Los Angeles, projects shipping volumes down 35% next week because of #Trump #tariffs. #USA #politics
on 02025-04-30#video #news saying Jamie Dimon, CEO of JPMorgan Chase, says the best-case scenario for #USA is a mild recession from #tariffs. US stock market down 8.4% in #Trump’s first 100 days, Canada up 3.4%, UK up 10.2%, Germany up 18.5%, Mexico up 20.9%.
on 02025-04-30#news #video #interview with AG Pam Bondi on the FBI arresting Milwaukee county judge Hannah #Dugan. #human-rights
on 02025-04-25#news #video on the #Philippines, and the potential of a South #China Sea war. #politics
on 02025-04-25#news #video on the FBI arresting Milwaukee county judge Hannah #Dugan. #human-rights
on 02025-04-25Tanner Leatherstein’s #video from a year ago comparing a #Hermes belt to a made-in-#China fake
on 02025-04-25#video on the #Hermes #China controversy, pointing out Hermès made €15.2 billion last year, working out to almost a million bags, which would be over 2000 bags per day, which seems like a lot for the French workshops they show. Claims Hermès is suing the Chinese factories that produced the TikTok videos for defamation
on 02025-04-25#news #video Karoline Leavitt says #Trump has 18 proposals on paper from countries around the world who “recognize that they have, in fact, been ripping off the United States” on #tariffs #politics
on 02025-04-25#news #video of “massive” attack on Kyiv, #Ukraine, killing 9 people with 4 not found yet
on 02025-04-23#news #video from what looks like a #China propaganda outlet saying the #EU is dropping trade barriers to Chinese products that it had instituted over the last few years in coordination with #USA. #politics
on 02025-04-23#news #video with Kishore Mahbubani saying that #Taiwan is the issue most likely to cause a war between #USA and #China at 18'26" in an #interview with #Al-Jazeera. #politics
on 02025-04-23#humor #video on “Game of Trailers: a Song of Rednecks”
on 02025-04-23#video on tips for hand-assembling surface-mount #electronics #hardware with a DIY vacuum pump, blu-tack, doublestick tape to keep component tape from moving around, polyester stencil for solder paste, etc.
on 02025-04-23#news #humor #video mentioning 60 Minutes executive producer Bill Owens resigned over threats to their journalistic independence. #human-rights #politics
on 02025-04-23#news #video about #India and #Pakistan coming closer to war after #Kashmir attack by the Baloch Liberation Army (or Lashkar-e-Tayyiba?); #Modi suspends the Indus Valley Water Treaty. Shahbaz Sharif has summoned the National Security committee in Pakistan. In Hindi. #politics
on 02025-04-23#news #video about #Trump defense secretary Pete Hegseth texting secret war plans again, this time to his wife, brother, and lawyer, according to a NYTimes article. Hegseth is now going on a witch hunt for leakers and fired three of his top aides. Karoline Leavitt: “This is what happens when the entire Pentagon is working against you and working against the monumental change that you are trying to implement.” #politics
on 02025-04-23#news #video saying #Trump is easing off on the trade war with #China following a meeting with Target and Walmart CEOs #politics
on 02025-04-23Lesley Carhart (#hacks4pancakes, they/them) made this #video about emigrating from the #USA.
on 02025-04-23#video #toread about “the death of affordable computing” #tariffs
on 02025-04-23#video on #laser diode wavelength stabilization by adjusting the drive current and temperature (using a resistive heating element!) to compensate for wavelength shifts. Demonstrates “mode hops” on an oscilloscope; the initial heating using a temperature sensor (a transistor I think) is to get it to a mode-hop-free region, and then the current is PID-controlled to stabilize the wavelength, and a second control loop adjusts the temperature to “desaturate” the current controller. He says he got the wavelength stabilized to ±2nm “over a range of 200mm”, which I think means 10⁻⁸, not 2/555 or so. #optics #toread #hardware
on 02025-04-12#news #video saying there was a false rumor that #Milei had decreed a US$100 monthly limit on bank withdrawals (a “corralito”) propagated on social networks by Peronists, referencing BCRA communiqué A8226, which this YouTuber interprets as meaning, instead, that you can only buy up to US$100 per month with pesos deposited in cash (as opposed to in your bank account). #Argentina #politics
on 02025-04-12#news #video about #export-controls in #China on #rare-earths, gallium, germanium, etc. #USA #politics
on 02025-04-12#news #video of Steve Bannon saying #Trump will run for a third term and win in 02029; Congressman Andy Ogles from Tennessee has already introduced a Constitutional amendment. Also talking about #Project-2025.
on 02025-04-12#news #video of #Milei’s speech yesterday announcing the end of #currency exchange rate controls (for individuals) #toread #politics #finance
on 02025-04-12#hardware #simulation #video by Sebastian Lague extending a simple store-ALU-output-in-A-or-B computer to have 256 bytes of simulated RAM. Includes a nice #introduction to SRAM and DRAM etc.
on 02025-04-12#news #video speculating that #China will invade #Taiwan now that they don’t have to worry about losing trade with the #USA, having already lost it to the #Trump #tariffs. Points out that Chinese imports from the US are easily replaceable things like soybeans, unlike fine chemicals and microchips. #politics
on 02025-04-12#news #video #toread from #Deutsche-Welle about the #Trump #China #tariffs exempting smartphones and laptops #politics #USA
on 02025-04-12#news #video: The #Trump administration says it will exclude electronics such as smartphones and laptops from latest #tariffs. That means such devices and their components won’t be subject to the current 145 per cent tariffs levied on #China, or the 10 per cent baseline tariffs elsewhere. #politics #USA
on 02025-04-12#video #interview by Rick Beato with #Tori Amos where she says she was feeling kind of depressed about what she'd achieved in her life and about what her postmenopausal life was going to be like, and so she was really happy to see a video he had done about how much Little Earthquakes meant to him (he doesn't only do interviews), which is how he got the interview
on 02025-04-12#video #news on the end of the #currency exchange rate controls in #Argentina announced at 18:11 today, effective Monday
on 02025-04-11#Business-Basics #video enthusiastically endorsing #Milei #politics. Misspells Cristina Fernández’s last name and Alberto Fernández’s last name in two different ways, mispronounces Macri, and incorrectly uses the Philippine peso symbol for the Argentine peso. Mostly broadly correct, except that it’s claiming that Argentina’s economy is great now, which it still isn’t. #toread
on 02025-04-10#news #video saying the #China #renminbi #currency is down to 7.4242 to the dollar, the lowest point since 02007. By anti-China propaganda channel #China-Observer. Mostly stock footage.
on 02025-04-10#news #video about the general strike in #Argentina that happened today, with a speech by Hector Daer and a few questions from reporters.
on 02025-04-10#news #video about #China’s new #USA export restrictions (not a full ban) on #rare-earths and other #critical-minerals in response to #Trump #tariffs.
on 02025-04-09#video from yesterday, Victor Gao saying, “We retaliate against what the United States will do even at the cost of a total war between #China and the United States, in terms of tariff war, or trade war, or otherwise.” #tariffs #politics #news
on 02025-04-09#Al-Jazeera #news #video reports that Lula is also considering a “retaliation ... bill to give Brazil’s government [administration] broad powers to respond quickly to unfair trade barriers. It can increase its own #tariffs on imports as well as suspending the payment of intellectual property rights and royalties.” Lula says protectionism has no place in today’s world.
on 02025-04-09#news #video from yesterday about two people from #China fighting in #Ukraine and captured by Ukrainian troops
on 02025-04-09#video #news of (JPMorgan Chase CEO) Jamie Dimon saying it’s perfectly reasonable to say that trade barriers were unfair, not just #tariffs, but that a recession is likely.
on 02025-04-09#video #news Ray Dalio criticizing #Trump but agreeing that the #USA’s trade imbalance is unsustainable and the lack of manufacturing is dangerous. But “3 million people, 1% of the population”, “are brilliant,” “half of them are foreigners,” “they go to the best schools”, and “make unicorns.” He’s also concerned about getting the budget deficit down to 3% of GDP and getting the debt down.
on 02025-04-09#video #news Reva Goujon says, “China is doing some interesting things in its implementing its provisions for the anti-foreign-sanctions law, it’s talking about countermeasures that include suspending IP rights for US companies in #China. That’s explosive.” #USA #politics #human-rights #copyright
on 02025-04-09#video #news on #China and #USA #politics, mostly about #Trump #tariffs, mentioning that the #Hutchison ports sale to BlackRock has been paused by Beijing
on 02025-04-09#video from the European Commission opposing #Trump #tariffs; the posture Ursula von der Leyen articulates here doesn’t seem to leave space for making common cause with China in response, though, promising more protectionist measures in response (and not just against the US). #politics
on 02025-04-09#news #video quoting Bill Ackman (Pershing Square Capital Management): “we are heading for a self-induced economic nuclear winter” #tariffs #politics #USA
on 02025-04-07#video #news on #Elmu criticizing #Trump #tariffs and also personally attacking Peter Navarro: “He ain’t built shit.”
on 02025-04-07#video of reverse-engineering the #Trump #tariffs formula. #news
on 02025-04-07#video #news with Altimeter Capital CEO Brad Gerstner on #Trump #tariffs: “Most of us are supportive of the president’s pro-business policies (...) but (...) these are not precision tariffs. This is a Navarro nuclear-style attack on American business.” JP Morgan raises recession odds from 40% to 60%.
on 02025-04-07#CNBC #news #video from today on #BYD #EV cars and their new 5-minute (?) 1-megawatt charging, and how BYD’s 02024 sales were US$109B, 29% up from the year before. Ford’s CEO is driving a Xiaomi SU7 EV.
on 02025-04-05talking-head and stock-footage #video from #Visual-Economik about the Plazza Accords and #Trump’s (poor) chances of achieving something similar today by way of promising to remove #tariffs.
on 02025-04-05#video #news from #Deutsche-Welle on #China imposing reciprocal #tariffs on #USA #politics, mostly just stock footage and talking heads. 34% tariffs on imports from the US, and a ban on seven rare-earth exports to the US and Europe. Jerome Powell, President of the Federal Reserve, predicts that the tariffs will probably cause #inflation in the US, unemployment, and slower growth. #toread
on 02025-04-04#video #toread of #Milei’s speech at the “American Patriots” fundraiser last night (?) #politics
on 02025-04-04#video on a Luxmux’s “Ultrawide Tunable Fabry Perot #Laser G5” #optics
on 02025-04-04#video about #USA #tariffs #politics
on 02025-04-02#video #toread arguing for a 100% asset allocation to (geographically diverse) equities
on 02025-04-02#video about #USA #tariffs #politics with Larry Summers
on 02025-04-02#video #toread about the cost of living in Buenos Aires
on 02025-04-02#video #toread about Korean house construction
on 02025-04-02#humor #video #toread about squirrelbot
on 02025-04-02#video #toread about JD #Vance #politics #news destroying relationship with Europe
on 02025-04-02#video #toread about tariffs #news
on 02025-04-02#Destin #video trying to understand why you get flashes of yellow light when you strike solid objects together.
on 02025-04-02#video #Applied-Science holy shit, Ben Krasnow now has high-speed camera lighting that’s brighter than the arc welding he was filming, but only at 450nm, naturally called “Helios”. The LEDs are running at 1 kilowatt in 10μs pulses at 1kHz, synchronized with the camera shutter, so he doesn’t need eye protection to look at it, and the average heat dissipation is “only” 10 watts. I’ve never seen a welding puddle like this before. This is amazing. Similarly for plasma cutting and laser cutting, including laser cutting of quartz and aluminum oxide.
on 02025-04-02#USA #politics #humor #news #video mentioning #Elmu leaving #Trump’s administration
on 02025-04-02#video on #manufacturing STM or AFM piezo actuators from piezo benders by cutting them into quarters with a box-cutter blade positioned by #3D-printing a jig
on 02025-04-01#news #video with footage from Rep. Hank Johnson reading a prepared statement in a #USA Congressional House Judiciary Committee hearing about #politics and #Trump’s attacks on #human-rights
on 02025-04-01#news #video from #Deutsche-Welle saying #Milei has lowered poverty significantly down to 38% and indigence to 8% (from 52% and 18% respectively), but about the same as before he assumed power. The Big Mac Index says the peso of #Argentina is the #2 most overvalued currency in the world, we have the most IMF debt of any country in the world, and the riesgo país is rising. #politics
on 02025-04-01#video #news on #PRC surrounding #Taiwan with ships in “surprise military drills”. #politics
on 02025-04-01#video #news on Wilson Martel Lebron, who was deported in the middle of his trial; the Massachusetts judge dismissed the case with prejudice and ruled the prosecutor in contempt of court because he aided in “a case of obstruction of justice, a case of violating the defendant’s right to be present at trial and confront the witnesses against him.” #USA #politics #human-rights #deportations
on 02025-04-01#video on the #history of Salk and Sabin’s vaccines for polio, mostly animation
on 02025-04-01#news #video from #Fox-News saying Maryland father Kilmar Armando #Abrego García was arrested in 02019 “in the company of other ranking gang members and was confirmed to be a ranking gang member of the MS-13 gang by a proven and reliable source,” according to the DHS’s assertions. #USA #politics #human-rights #deportations
on 02025-04-01#video from 02002: “Disposal of organic waste in Erta Ale Volcano lava lake causes violent eruption” researchers tossing a bag of garbage off a cliff into a crater.
on 02025-04-01#news #video by Joe #Rogan condemning #Trump for sending innocent people, like Maryland father Kilmar Armando #Abrego García (whose 5-year-old US-citizen son is autistic) who fled El Salvador in 02011, and gay makeup artist Andre José Hernandez Romero from #Venezuela, to #El-Salvador in #deportations to #CECOT
on 02025-04-01#news #video saying #Trump administration is admitting one Maryland father, granted protected status in 02019, was mistakenly included in the #deportations to #El-Salvador due to an “administrative error”, but can’t be brought back. #USA #politics #human-rights
on 02025-04-01#news #video saying Virginia Giuffre, #Epstein accuser, has four days to live following kidney failure from a car accident
on 02025-03-31#news #video #interview with Taliban Ministry of Foreign Affairs spokesperson Abdul Qahar Balkhi, who refers to ISIS as #Daesh. #politics #Afghanistan
on 02025-03-31#news #video from today saying #Ukraine is declining #Trump’s peace deal with Russia. #politics
on 02025-03-31#news #video saying Jason Stanley, Yale professor who wrote How Fascism Works, is leaving #USA. #politics
on 02025-03-31#news #video saying #Elmu resigned from #DOGE (pure talking-head filler) #politics #USA
on 02025-03-31#news #video of talking-head and stock footage about #rare-earths, which #Ukraine doesn’t actually have. Also the global rare-earths market is only US$5 billion a year. #politics
on 02025-03-31#news #video on #Trump saying yesterday he’ll give #Iran “bombing the likes of which they have never seen before” if they don’t agree to a nuclear deal. Also threatened “secondary tariffs” on Russian oil and “military force” to annex Greenland. #USA #politics
on 02025-03-31#video advertising Watergen and Source Global #desiccant #air-conditioning
on 02025-03-31#video advertising BFREEZE #desiccant #air-conditioning, explaining how to beat the brine-bulb temperature
on 02025-03-31short #video advertising AOLAN #desiccant #air-conditioning
on 02025-03-31#video on semiconductor manufacturing in #China and #USA. Footage of #Trump saying the CHIPS act was a “terrible, terrible thing” and “We should get rid of the chip act”. #ASML’s biggest market is now Mainland China rather than #Taiwan, selling US$10.9 billion per year there, and they’re opening a reuse-and-repair center in Beijing. The US had pulled ahead in Q4, but that was because of the #CHIPS-Act. #Ant-Group is using chips made by Alibaba and Huawei instead of NVIDIA to train their MoE #AI models.
on 02025-03-28#video on Li Ka-Shing sale of 43 #Hutchison ports to BlackRock, suggesting #USA wants to cut off #China’s trade routes #news #politics
on 02025-03-28#video #news on Hong Kong tycoon Li Ka-Shing’s Cheung Kong Group selling off #Hutchison Ports’ stock, 43 of 53 major international ports in 23 countries, including the ports at both ends of the #Panama Canal, for US$19 billion, (and there was something about 90% of stock, it’s not clear) to the #USA, suggesting he anticipates war. #politics #China
on 02025-03-26#video by #Bugeja on getting piezo buzzers to provide useful haptic feedback by overvolting them to 200V with a TI DRV8662. #electronics #hardware
on 02025-03-26#video on #Nighthawk trying to form stable colloid #phase-change #energy-storage #materials with sodium lignosulfonate #toread
on 02025-03-26#video on #USA arresting German tourists and permanent residents on entry to the country and detaining them, sometimes for weeks: 34-year-old Fabian Schmidt (incommunicado for 4 days), etc. #politics
on 02025-03-26#video on Turkish Fulbright scholar Rumeysa Ozturk being snatched off the street yesterday in Somerville, MA by masked ICE officers for publishing an editorial in the Tufts Daily opposing #Israel’s invasion of Gaza a year ago. #news #politics #USA
on 02025-03-26#video of soldering wires on a perfboard for #electronics in inconvenient packages
on 02025-03-26#video dead-bug soldering an SMD package (a relatively fine pitch LGA) on a prototyping area with superglue. #electronics #hardware
on 02025-03-26#video #news: #Trump threatens a 25% “secondary tariff” on any country that buys oil or gas from #Venezuela starting April 2; oil is 80% of its exports and 17% of GDP. #USA #politics
on 02025-03-26#news #video saying #BYD is #manufacturing #EV cars in Thailand and Brazil, and soon in Indonesia and Hungary. #China #politics
on 02025-03-25#Turkish state TV TRT #video about fairly mild #human-rights abuses by the government of #Israel against an Australian tourist, Anastasia. #politics
on 02025-03-25#ElectroBOOM #video on #Switzerland, including Montreux, Lausanne, Vevey, Geneva, and finally Annecy and Lyon in France, with lots of pretty tourism footage
on 02025-03-25#video on #Chinese word structure, giving many examples of very logical words, in both Mandarin and Cantonese.
on 02025-03-25#video on #precision #piezoelectric motors
on 02025-03-25#AI generated #video of Mortal Kombat characters
on 02025-03-25#video by #Thoisoi on making metal foam #materials. Very low quality text-to-speech audio (in particular, missing all the quantitative information!) and a significant amount of talking-head filler and stock-footage filler, and he spends a bunch of time talking about misleading relationships between metals’ density and chemical properties. He finally starts making hydrogen-blown aluminum foam at 10'20" after some fake video of typing a Google search by melting calcium into it at supposedly 760° in his furnace, but the crucible and alloy don’t glow, so that must be the wrong temperature. Some footage of reacting calcium granules with water and setting them afire. He adds titanium hydride as a hydrogen source, mixing it into the alloy with a quartz tube as it’s starting to decompose, so that the hydrogen will dissolve in the aluminum.
But that didn’t work, so he tried again without adding any calcium beforehand, then adds the calcium granules once the aluminum was already melted; this time, when he adds the hydride, the aluminum starts to foam immediately, but only foams a little.
On a third trial, he lowered the furnace temperature to 700° (but the aluminum and crucible are still not glowing) and got slightly better foam, but still pretty bad, more like sourdough bread than a sponge.
I suspect the calcium is to reduce the surface tension of the aluminum, because the alloy wets the crucible more, but it doesn’t seem to have worked very well.
He bought some commercial aluminum foam samples, which weighed 0.27g/cc, but didn’t bother to test its material properties quantitatively.
on 02025-03-25#video on glass-ceramic #materials like Robax and Zerodur for #bootstrapping optical instruments from household materials, measuring their CTE with a homemade length measuring rig and an infrared thermometer. Also mentions “Photoform” photolithographable glass. He explains how lithium (and zinc) silicoaluminates have a negative CTE and thus convey a vanishing CTE on the glass-ceramic composite, and how 1-6% of titania or zirconia is included as a nucleation agent. He recommends Bach (ed.)’s book Low Thermal Expansion Glass Ceramics.
on 02025-03-25#video about ultrasonic #machining #manufacturing to drill glass with 40kHz ultrasonic spindle units for grinding, developed in the early 80s by Yoshihiro Take, chairman of Takesho, in Kasuga, Fukuoka Prefecture, Japan, as reported by Michelle Yamamoto
on 02025-03-22another #SLS #3D-printing #video on Micronics’ product (looks like US$3700 desktop SLS of metal-filled nylon 12 (US$88/kg) or TPU, not metal), by #CNC-Kitchen. Still on Kickstarter, though. They’re using quartz-halogen bulbs to preheat their build chamber so they can use just a 5-watt blue diode laser with a 250μm spot size to “kick it over” the melting point. Too bad about the large spot size; they say their step accuracy is 5μm, and they’re using 110μm layer height. Inside the printer they have a “carbon HEPA filter” to remove dust.
on 02025-03-22another #SLS #3D-printing #video #toread
on 02025-03-22#video #toread on #bootstrapping #DIY SLS #3D-printing using Inova
on 02025-03-22#video on #3D-printing in metal with laser SLM in a #DIY rig #bootstrapping #manufacturing #toread
on 02025-03-22#video on #Prisonbae Jeremy Meeks, describing his life and advocating prison #reform.
on 02025-03-20#video #toread #interview with Anna #Cramling for three hours about #chess, largely explaining the basics of the game.
on 02025-03-20#video of Anna #Cramling playing #chess against Alexandra Botez (of #BotezLive) in a tournament game; a 24-minute video about a four-hour game. Mostly talking about her feelings during the game. “I got crushed by Alexandra.”
on 02025-03-20#humor #video of famous videogame streamer Asmongold “reacting” to a horror satirical video by Aamon Animations called “Asmongold: Eldritch Gamer”.
on 02025-03-20#humor #video of famous videogame streamer Emiru (Emily Schunk) and her husband (?) Tectone feeding fruit to their business partner, even more famous videogame streamer Asmongold, which he claims to never have seen. It’s a traumatic experience (he likened eating a raspberry to his experience licking a battery), but they put together a tier list of fruits.
on 02025-03-20#video interviewing US veterans fighting in #Ukraine on differences from Afghanistan and Iraq
on 02025-03-19#video on #chess streamer sisters #BotezLive answering most searched questions
on 02025-03-19#video from #Uganda with the popular #meme “Why are you gay?” at 1'10”.
on 02025-03-18#humor #video about “hey Homie it’s Tony” of #LC-Sign #toread
on 02025-03-18#humor #video ridiculing #Trump #politics and predicting a “Chinese century”
on 02025-03-18#Hyperspace-Pirate #video about wireless power transmission #electronics using tuned coils, blocking oscillators, ZVS drivers, gate drive transformers for MOSFETs, etc.
on 02025-03-18#math #video #toread about #optimization in #C of Fibonacci number computation
on 02025-03-18#video from #Wuerth on aluminum polymer capacitor #electronics #hardware. Suggests estimating the lifetime of an aluminum electrolytic as L_0 \cdot 2^{\frac{T_0 - T_x}{10°}} and an aluminum polymer capacitor as L_0 \cdot 10^{\frac{T_0 - T_x}{20°}}. So every 20° drop in temperature from the max operating temperature T_0 extends the lifetime of the aluminum electrolytic 4× and the aluminum-polymer cap 10×, though warning, “All ratings over 10 years are very much theoretically [theoretical].” Suggests aluminum polymer caps are worse for low-energy applications and battery-powered applications (because of higher leakage), and high-vibration applications, than electrolytics, but better for low-temperature applications (because of freezing) and DC-DC converters, as well as high temperatures.
on 02025-03-18#video by Andrej #Karpathy on how he uses #LLM #AI two years ago
on 02025-03-16#video of #Contiki running a web browser on an Apple iiGS #retrocomputing
on 02025-03-16#video #toread by #Haijun-Xia about how #HCI can integrate properly with #AI only if GUIs are totally redesigned to not be human-powered
on 02025-03-16a new #3Blue1Brown #math #video about the colliding blocks computing π, making a connection to Grover’s algorithm in #quantum-computation #toread
on 02025-03-15#video about vanadium redox flow batteries, the biggest in the world deployed by Rongke Power at Xinhua Ushi Energy Storage Project in Xinjiang (175MW, 700MWh = 2.5TJ), dwarfing Sumitomo's 51MWh jobbie from 02022, and a 500MW 1.2GWh one planned for Laufenburg, Switzerland. The #Undecided video isn't entirely talking heads and webpage screenshots. #energy #energy-storage
on 02025-03-15#news #video saying #Israel is the only country to run its #F-35 #weaponry on domestic software, and (presumably because of #Trump’s freeze on aid to Ukraine) European #politics are concerned about this suddenly. Seems to mostly be a question of electronic countermeasures or countercountermeasures. #Deutsche-Welle
on 02025-03-14#video about changing over a (bulk cargo?) ship from maritime very low sulfur fuel oil (VLSFO, ≤0.5% sulfur, 180–380cSt at 50°, service tank temperature 90–95°, injection temperature 130–140° for 12–13 cSt viscosity) to low-sulfur marine gas oil (LSMGO, US$674/tonne at the moment, according to Ship & Bunker’s Singapore bunker prices chart, while VLSFO is only $672/mt) in order to reduce SO₂ emissions to enter the North Sea SECA zone. It’s remarkable to me to see such an in-depth explanation of how to run a container ship on YouTube.
on 02025-03-12another #My-Engines #DIY #EDM #machining #video. Finally he got his pulse EDM working. He had blown the protection diodes and the pulse transistors in the #electronics. His numerous 25Ω power resistors were inadequately heatsinked. He found that long on-times were the key to low electrode wear, backwards from what I would have expected. Sadly he doesn’t say anything about his parameters (voltage, current, frequency, duty cycle) or circuit design. Looks like he’s at about 5kHz. He’s using a diesel fuel pump to circulate his lamp-oil electrolyte (kerosene) through water filters.
on 02025-03-12another #machining #video, by #My-Engines, on die-sink #EDM based on Ben Fleming’s book, using varying sizes of capacitors in an RC setup (16μF, 32μF, 192μF) with the lower capacitances giving a finer finish. He has some detergent (“wetting agent”) in his water electrolyte, presumably an nonionic surfactant (he says his tap water works better than deionized or distilled). However, though big electrodes worked fine, his thin copper and brass sheet electrodes eroded too rapidly, and he wasn’t able to get a stable “burn” out of either them or graphite. Lamp oil worked better than vegetable oil or water for him. #electronics #bootstrapping
on 02025-03-12#machining #video by #AndysMachines on his die-sink #EDM #machining #manufacturing setup. He’s using an aquariump pump to circulate his distilled-water electrolyte through a coffee filter, which needs changing often. He switched to a photo-flash 160μF capacitor for his IGBT-triggered 60V sparks (averaging around 50V). The #electronics use two DRV8825 stepper drivers, though they have trouble with the noise; the die advances when the current averages below an adjustable limit of 2.5 amps, and then there are periodic retractions to permit better flushing. He measures the capacitor voltage with a voltage divider to estimate the current. #bootstrapping
on 02025-03-12#video by #AndysMachines on #EDM #machining, using an RC circuit to limit the energy of each spark and an IGBT to switch it, with 20μs on and 180μs off time (5kHz 10%), 60V, a 100μF electrolytic cap (which gets too hot), a heating element to limit the cap’s inrush current, a 3mm brass electrode cutting aluminum, and just distilled water for the dielectric. He makes it through 1mm of aluminum in 23 seconds, 18mm³/minute. #electronics #manufacturing #bootstrapping
on 02025-03-12#video of die-sink #EDM #machining in diesel fuel using an Arduino, a MOSFET for PWM, a halogen worklight in series to limit current, and a stepper motor. #TheIdahoanShow reports that motor oil, WD-40, and canola oil also work, and aluminum and brass (such as a cartridge case) both work well as electrode materials, but TIG welder electrodes tended to stick and not cut very well. Stainless “kind of worked”. His demo was to cut a plus-sign-shaped hole into a chunk of old file. #bootstrapping #DIY #jugaad #manufacturing
on 02025-03-12#video on #bushcraft cordage, making rope out of banana peels and whatnot
on 02025-03-11#video on making #ceramics without spending any money using “wild clay” and wood pit firing in his cornfield
on 02025-03-09Corona beer #ad #video about #America
on 02025-03-09#Argentina #immigration #humor #video
on 02025-03-07#video of six minutes of footage from 01991 inside Kowloon Walled City. #history #favelas #arcologies
on 02025-03-07#video “Wheel of Prosperity” a black-and-white documentary from probably sometime in the 01960s about spinning wheels #charkha in #India
on 02025-03-07#Breaking-Taps (Zachary Tong) #video on liquid-metal ion thrusters for #space
on 02025-03-06#video by #Asmongold on #Elmu and his radical shift to hard right-wing #politics and the Tesla boycotts. #USA
on 02025-03-06#Fox #news #video about #PRC’s statement that it is ready for “any kind of war” with #USA on the basis of #Trump’s #tariffs. Trump announces the creation of a “office of shipbuilding” and promises to invade #Panama to get the canal back. #politics #China
on 02025-03-06#USA #Fox #news #video on #Trump revoking the legal #immigration status of 240k people who fled #Ukraine. #politics
on 02025-03-06#video on whether drug #cartels in #Mexico will use #drones or similar #weaponry against #USA Marines etc. (as they have been against rivals) who are apparently patrolling the border now; #Asmongold does a live “react to” stream to a pro-#Trump #politics YouTuber; he predicts an invasion of Mexico. Illegal #immigration is being blamed for US gangs in New York in homeless shelters.
on 02025-03-06#Argentina #news #video from #La-Nacion about the Línea Mitre trains today not reaching Retiro because of #blackouts. Supposedly as of 8:05 AM, Edesur says 6290 households are in the blackout, which seems absurdly low for a blackout that’s interrupting train service, and 2.671 million who aren’t. Edenor has 1137 household in blackouts and 3.309 million who aren’t. Four high-tension lines apparently out of service? Footage of people trapped in a dark subte yesterday fanning themselves with hand fans.
on 02025-03-06#news abridged #video of #Trudeau in #Canada announcing tariffs against #USA #politics
on 02025-03-06#news #video on #Trump backing down on #USA tariffs on #Canada and #Mexico, but only on autos. Almost entirely a tiresome talking head lecture #politics
on 02025-03-06#video of slingshot #weaponry shooting darts made from wooden dowels with broadheads screwed into an aluminum insert on the front of the shaft.
on 02025-03-06#video by #The-Gripsion on isopropanol-powered #weaponry made from a pocket flashlight battery chamber, shooting blowgun darts made out of sewing needles, hot glue, and paper, weighted with a bit of solder; at 320 “feet” per second, they penetrate about 8mm of plywood. He’s speaking with a heavy US accent, so this is almost certainly an illegal firearm.
on 02025-03-06#video on quantum #physics by #Veritasium walking through the principle of least time with the beach example, Maupertuis’s principle of least action, the Ultraviolet Catastrophe, Planck’s solution, the photoelectric effect, Bohr’s computation of the hydrogen spectrum, de Broglie’s matter-wave hypothesis, etc. At 22'30" he derives the least-action principle from the quantum-variational stationary-phase principle.
on 02025-03-06#video of #Trump defense secretary Hegseth describing US taxpayers as working to support US soldiers, saying he wants to make the #USA military the world’s biggest and “most badass” and “restore the warrior ethos”.
on 02025-03-04#video of #FireballTool testing ratchet straps to see if twisting them weakened them. One twist doesn’t, four twists doesn’t, ten twists does slightly, being wet doesn’t, and a knot reduces their strength almost 3×.
on 02025-03-04#video #toread of #ThisOldTony #manufacturing a curved air knife
on 02025-03-04#video of #StuffMadeHere failing at making a flywheel-powered helicopter
on 02025-03-04#video of #Applied-Science making LED-array Fourier #ptychography work for #microscopy. He explains a lot of things he tried that didn’t work.
on 02025-03-04#video of #Bitluni making a laser vector display with some laser galvos driven from an #ESP32, burning out a lot of hardware in the process. #microcontrollers #electronics #hardware
on 02025-03-04#video extensive footage of #Ukraine #drones #weaponry dropping bombs on individual Russian soldiers, mostly in trenches, killing them. Also includes footage of house-to-house fighting in Shcheribivka (?). Lots of heat-vision footage. Also includes footage of tank-to-tank (or IFV-to-tank?) combat. By #Sinyor-Media.
on 02025-03-04#video #news on #Ukraine doing the “first all-robot assault” on a ground position at Lyptsi, near Hlyboka, by the 13th National Guard brigade. Includes footage from “Army TV - Ukrainian Military Channel”. #toread #weaponry #drones
on 02025-03-04#video on “SixNeedler” CO₂-powered dart gun #weaponry by #Joerg-Sprave. Testing on a cut of pork. The blowgun darts are about 150mm long with a plastic cup on the back, presumably to catch the compressed air. Rather horrible to think of these nails going into a person. Apparently this is a product he’s going to be selling starting in the summer. Under 6 “foot pounds” (8.1J) and so he thinks it should be legal in the UK.
on 02025-03-02#video on Norway’s Holtback Bunkers Corp. cutting off fuel supplies to the #USA military until #Trump leaves office, following his criticism of Zelenskyy. #Ukraine #news
on 02025-03-02#video on #Ukraine attempts to recapture Kotlyne from the Russians. Mostly just maps #politics
on 02025-03-02#video #toread on #USA CIA flying Predator #drones over #Mexico to provide information on drug cartels to the Mexican authorities. #politics
on 02025-03-01#video #toread about #Ukraine "Sea Baby" maritime drone #weaponry which supposedly has “sent Russia’s Black Sea fleet packing”.
on 02025-03-01#video of #Ukraine Magyar Birds #drones destroying Russian #weaponry while controlled over fiber-optic cables. Lots of purported battlefield footage with a voiceover with a native US accent reading a script written by somebody who doesn’t speak English very well; AI? Several instances of FPV drones piercing howitzer barrels with strapped-on RPGs, lots of FPV footage, some heat vision. By #Sinyor-Media.
on 02025-03-01#news #video of #Zelenskyy and #Trump yelling at each other in front of the US media in the Oval Office today. #Ukraine #politics
on 02025-02-28#news #video about infiltrating the Doce Tribus cult here in #Argentina #toread
on 02025-02-27#news #video that tomorrow the ATE is having a nationwide strike in #Argentina against #Milei. #politics
on 02025-02-27#clickbait #video about Billy Bob Thornton’s relationship with Connie Angland, who he married in 02014, and his previous relationships
on 02025-02-27#video on intercepting Russian fiber-optic-driven FPV #drones #weaponry
on 02025-02-27#video on Australian #PPDS #drones: cardboard, or waxed-paper foamboard sandwich, airplane-shaped, “origami of death”, being used in #Ukraine for #weaponry. 24 shipped flat-packed in a pizza box, front propeller, catapult launch, straight wings attached with rubber bands, 5.3 “pounds” empty, 6.6 “pounds” payload, 37 “miles” per hour, 75 “miles” range. Unit price speculated to be between $670 and $3350, an oddly precise upper bound suggesting wankery around exchange rates. It’s claimed that the MiG-29 and four Su-30s destroyed at the Kursk airbase were destroyed with these drones at well over their nominal range. #slaughterbots
on 02025-02-27#drones carrying PKM #weaponry in #Ukraine #video
on 02025-02-27#NileRed #video copying #kiwami-japan’s bismuth knife
on 02025-02-26#CNN #news #video: “We [#USA] are on the path out of #NATO (...) we are aligned with what has always been NATO’s principal threat. (...) I would say 95%+ of NATO’s planning during the Cold War and since then has been concerned about a Russian attack. That is the fundamental motivating factor why the alliance was created and why it still exists today. And we have sided now in this vote with NATO’s principal adversary.” —John Bolton. #politics. The “and since then” and “why it still exists” are deliberate and very significant from my point of view; it’s a fatal counter to any argument that NATO isn’t really an anti-Russian alliance. #Ukraine
on 02025-02-26#video on #Grandpa-Amu #bootstrapping a pedal-driven wood #lathe, including a three-jaw chuck consisting of three bolts in a piece of wood with captive nuts. Also demonstrates bow drill, the kind of workbench you sit on, etc. Rather than using a pole for the return spring he cuts a piece from a bicycle inner tube.
on 02025-02-22half-hour #video lecture on generation of buildings with grammars (including shape grammars like CityEngine’s CGA) by Rachel Hwang. I think she was teaching the class “CIS 700 - Special Topics in #Procedural #Graphics” at the University of Pennsylvania in spring 02016.
on 02025-02-21#video on producing a sealed ecosystem made of a dude and Chlorella. He uses basswood bubblers to distribute the air better than aquarium stones do. Tips on photobioreactor design: “Grow Chlorella faster than the bacteria can eat your Chlorella.” His first run with 800 liters (?) of Chlorella only absorbed a quarter of the CO₂ he was exhaling, though similar tests in the past had absorbed all of it. It turned out the algae were releasing CO₂. A later run worked even more poorly. Maybe the basswood was poisoning the algae or something. After a failed attempt to switch to Spirulina, he tried again with Chlorella and it worked great, maintaining the room below 1000ppm CO₂ for an hour, and delaying 2000ppm from 17 minutes (in his worst test) to 2 hours and 23 minutes.
on 02025-02-20#video about the construction of The Mukaab (The Cube) in Riyadh, in Saudi Arabia, a building that is a 400-meter-side cube, which will be larger than the Boeing Everett Factory, which apparently has beaten the Pentagon for a while. The company building it is New Murabba, headed by a white guy (!?) named Michael Dyke (?!). Ground has been broken (according to satellite photos from September 02024), but the total expected cost is US$50B. As of October they’d excavated 10 million m³ of dirt, 86% of the required excavation. #The-Line (part of NEOM) similarly excavated 170km of foundations two years ago, but has drastically scaled down due to a lack of investors.
on 02025-02-20#history #video about the Albazin star fort which withstood the (Qing) Kangxi Emperor’s siege in 01686, despite 650 of the 800 defenders dying, before being ceded to China in the Treaty of Nerchinsk.
on 02025-02-20#history #video about how Ottoman cannons conquered Constantinople, resulting in star forts, bastions, half-bastions, crownworks, hornworks, glacis, tenailles, ravelins, the Trace Italienne, and Vauban forts.
on 02025-02-20#video #news of Roger #Waters addressing the UN Security Council (!?) about #Ukraine, quoting Smedley Butler. #politics
on 02025-02-20#video #news on #USA #Trump #politics: “NATO is a deterrent organization. It kept the peace for four generations. I think that’s over. (...) Fortunately, both the French and the Brits have a nuclear capability. Otherwise, the nuclear assurance that the US grants to our allies in Europe would be gone also.” Gen. Barry McCaffrey, (Ret.), US Army
on 02025-02-20#video on autonomous submarine #drones
on 02025-02-20#video on GPS-denied, anti-jam autonomous #drones and #motion-planning using a #Raspberry-Pi 4 running #ROS. He calls his flight control software #dRehmFlight. Apparently Intel’s “RealSense tracking cam” does “optical flow” inside the camera to measure changes in orientation. The main drone body seems to be laser-cut from MDF. He’s using #D-star Lite instead of A* for his #path-planning graph search. #robotics
on 02025-02-20#video on the Socialist Rifle Association in Maryland
on 02025-02-19#video #toread by Pat Deegan on #electronics #hardware #analog #ASIC design with Tiny Tapeout. Demonstrates how to use xschem.
on 02025-02-16#Chinese #video tone pair pronunciation practice #toread
on 02025-02-15#video #toread on #Chinese linking words (function words, conjunctions) from #MandarinBlueprint. 和, 也, 而且, 不仅, 又...又..., 并且 (written only), 再者 (written only), 或者, 可以 (in passing), 还是, 要 (in passing), 要不, 不然, 要不然, 最好 (in passing), 可能, 得 (in passing), 每 (in passing), 不然呢, 要么...要么..., 继续 (in passing), 但(是), 想 (in passing), 时间 (in passing), 一些 (in passing), 可是, 还要 (in passing), 不过, 而, 因为, 非常 (in passing and not defined), 既然, 这么 (in passing), 所以, 不能 (in passing), 来 (in passing), 然后, 先, 做 (in passing), 虽然...但是..., 尽管...(还是)..., 哪怕...也..., etc. All the most common words I’ve been struggling with!
on 02025-02-15#video #toread about ways to form adverbs in #Chinese (Mandarin and Cantonese)
on 02025-02-12#video #toread with 8 hours of explanation and examples of #Chinese grammatical patterns
on 02025-02-12#video with #Chinese listening practice from #LingLing Mandarin.
on 02025-02-12#video on #Ukraine #weaponry, saying they passed Zelenskyy’s target of manufacturing a million #drones in the year 2024 — in February. Mostly about “cope cages” and “turtle #tanks”. From pro-Ukraine propaganda outlet “Military Show”.
on 02025-02-12#video #news of #UK defense minister Healey listing #weaponry sent to #Ukraine last year: “10000 #drones” is the only thing worth mentioning. Hegseth says #Trump’s approach to the war is that the war must end. “We want, like you, a sovereign and prosperous Ukraine, but we must start by recognizing that returning to Ukraine’s pre-2014 borders is an unrealistic objective. (...) The United States does not believe that NATO membership for Ukraine is a realistic outcome of a negotiated settlement. (...) As part of any security guarantee, there will not be US troops deployed to Ukraine.” Not sure what he thinks about Donetsk and Luhansk. #politics
on 02025-02-12#video of JD #Vance giving a speech at the AI Action Summit yesterday. #USA #politics #news
on 02025-02-12#video of Matt #Taibbi testifying before #USA Congress today about censorship and anti-journalism. #politics #news
on 02025-02-12#video claiming #China’s Xi has ordered the military to be able to invade #Taiwan by 02027. #politics
on 02025-02-12#video of 240kV power #electronics driving a 30kA Lorentz-force-confined plasma 10 meters starting with a wire. Originally an SRL device. By #LightningOnDemand. Reuploaded to #Odysee after being removed from YouTube.
on 02025-02-12#video on #electronics comparing XY mode on analog and digital #oscilloscope instruments with a circuit that uses the scope as a vector display
on 02025-02-11#Chinese HSK 1 listening practice #video. Also too hard.
on 02025-02-11#Chinese listening practice #video with traditional subtitles about Qin Shi Huang with AI art and talking heads. Too hard for me right now.
on 02025-02-11#video on a very ingenious discrete-only transistor curve tracer with 21 discrete components. #electronics #hardware
on 02025-02-10#Primitive-Technology #video on a smelt (#bootstrapping #materials) with a flywheel-driven blower, giving disappointing results.
on 02025-02-06#Applied-Science had to replace the image sensor chip on his camera PCB many times in order to use an oil-immersion microscope objective backwards as an f/0.38 lens (f=4mm). #electronics #hardware #optics #video #bootstrapping #toread
on 02025-02-05#EEVblog #video on identifying a blown SOT23 dual-diode from a board photo
on 02025-02-05#Veritasium #video of aspheric electron #microscopy using radially asymmetric magnetic lenses
on 02025-02-05#video of 240kV power #electronics driving a 30kA Lorentz-force-confined plasma 10 meters starting with a wire. Originally an SRL device. By #LightningOnDemand.
on 02025-02-05#video of FDM #3D-printing at 1000fps using a used mass-market Sony RX100V digital camera. Explains “shaping” algorithms to suppress vibrational modes of the printer detected with accelerometers during an initial shake. Shows die swell and filament purging smoke.
on 02025-02-03#Shake-the-Future #video of a microwaveable soldering iron with a sodium-silicate-bonded carborundum susceptor, which is wrapped in a ceramic-fiber blanket to hold it in place inside a cage made by #3D-printing a high-temperature resin. The blanket is in turn held in place with green (!) Kapton tape. 30 seconds in his household microwave heated the 10 grams of carborundum to a nice electronics soldering temperature. He soaks the exposed edge of the blanket with boric acid with the idea that this will keep it from fraying and producing irritating dust.
on 02025-02-03#video #interview about #Slaughterbots with Shashank Joshi of the Economist.
on 02025-01-30#Samyam #video about #games development, ranking types of developers into 7 tiers (though naming individuals in only a few cases)
on 02025-01-30#video #interview with #Palmer-Luckey from 02023 (though released only three months ago) about #Anduril and other #weaponry, a foursome by Erik Torenberg ("Upstream" on the podcast network "Turpentine") with someone from #Varda. Lots of belligerent rhetoric attacking #China, proposing “defector visas” and citizenship under the illusion that many people are desperate to leave China. Luckey proposes that the PRC might blockade #Taiwan as a way to force capitulation to reunification without shooting. Describes Chinese immigrants to the US as “traitors to their country”, approvingly.
on 02025-01-30#video of #pmarca saying it’s “morning again” in #USA #politics due to #Trump, 74 minutes. I didn’t realize Al Gore sponsored the legislation that created NSFNET; I thought his advocacy started with the com-priv era.
He mentions the end of Chevron deference, which he argues means that executive agencies should abandon their quasi-legislative functions. He also questions the idea of “independent agencies” in the executive branch, like the FTC and NRC. The interviewer, the Hoover Institution’s Peter Robinson, argues that the CFPB's director not being fireable by the president is “unconstitutional on the face of it”, prefiguring the Slaughter verdict (I’m writing these notes in 02026).
Cites #Yarvin approvingly at 25'54" saying that we’re 80 years into FDR’s personal monarchy.
Also mentions #Elmu has been “living at” Mar-a-Lago.
Also mentions the #history of Nixon’s “Project Independence”, which I hadn’t heard of, to build 1000 #nuclear #energy power stations in the US, which turns out to be at best a very incomplete description of Project Independence.
Describes #Anduril’s original business plan as “We have to invest in this company, and his business plan is to hunt Mexicans at the southern border in 2016. And we’re just like, oh, God, we just basically have a heart attack.” So Andreessen Horowitz didn’t invest, and Trump didn’t want Anduril to do it, so they switched to military systems, which became accepted in Silicon Valley with the tragedy in #Ukraine.
Robinson claims that the US’s “only sustainable advantage over the Chinese is going to be technological innovation”, since they’re more numerous and richer, which doesn't make sense to me — how are they richer if they’re dumber, as he’s implying? Pmarca doesn’t disagree, citing the Pentagon’s new COO, Steve Feinberg, as someone who can make this happen.
At 56'40" he says the Ukrainian sea drones are built out of commercial jetskis.
At 60'40" pmarca makes the very reasonable points that productivity growth in the US has been low since about 01970, and that low growth creates zero-sum economics, which creates zero-sum politics, “where the only way for anybody to get anything is to take it away from somebody else.”
on 02025-01-29#video #interview with #Palmer-Luckey by Jim Gash, the president of Pepperdine; Luckey wears a NERV jacket (from Evangelion) and describes himself as “a propagandist” and says he’ll “twist the truth”. Really interesting insights about the #history of Oculus, like fixing geometric distortion and chromatic aberration in software instead of optics. Says he’s “still extremely bitter” about his ouster from Meta. #weaponry #Anduril
on 02025-01-29#video on #weaponry against #drones, specifically a truck-mounted “Bushmaster” machine gun shooting 30mm HE rounds with RF proximity fuses
on 02025-01-28#Palmer-Luckey gearing up to go to war with #China in 02027 with his billion-dollar Arsenal-1 Ohio factory is disquieting. #politics #Anduril #weaponry #video
on 02025-01-28#video by #Hyperspace-Pirate of zesty bridgewires with 4kJ in a bank of five capacitors in series, with a calculated peak of 10kA, charged up with ZVS #electronics. He blew up his flyback diode and his SCR. Relatively poor slow motion footage. #hardware
on 02025-01-23#video by Nina Aouilk on surviving an attempted honor killing for leaving an arranged marriage
on 02025-01-08#video on polyandrous (and occasionally polygynous) Naxi village called Eya in Sichuan, #China, and local Douyin influencer Guma
on 02025-01-08#GreatScott #video #toread on the #TL431 #electronics #hardware
on 02025-01-08#video #toread about the determinism dome paradox in Newtonian physics.
on 02024-12-28#video of "Not an engineer" #machining a new head for his milling machine, with a pneumatic tool changer and liquid cooling, out of a weldment.
on 02024-12-28#video on #Hyperspace-Pirate #bootstrapping DIY #CNC upgrades. He drilled the aluminum parts (on his drill press, I assume) with locator jigs made with #3D-printing; that’s almost 3-D printing of aluminum, right? Two nuts on every leadscrew, separated by a nut block, can be preloaded (with four screws in each nut) to reduce leadscrew backlash. His gantry machine frame is largely #8020 rail held together with 3-D printed PLA brackets. He says FreeCAD is very intuitive and easy to use.
on 02024-12-27#Bitluni assembling a US$140 #CNC mill from a kit four years ago. After some trial and error and breaking a D-bit from having too low a speed and too high a speed, and an end mill from a mistake I didn’t understand, he does eventually succeed in #manufacturing a “PCB” from copper-clad. #video
on 02024-12-27#La-Nacion #news #video about a MoU being signed for a US$140 billion export deal for #LNG from Vaca Muerta in partnership with Shell which is apparently displacing Petronas as a candidate partner. Probably kind of stupid given what’s happening with solar, but gas certainly has a role to play in peakers before battery capacity is built up. They say it's “gas no tradicional” which I think means they’re cooking shale. They’re saying maybe they’d have an export terminal in place by 02027 or 02030, which seems far too late; the floating LNG terminal that we had when Macri was president might work. Pure talking-head filler. #Argentina #energy #politics
on 02024-12-23#news #video suggesting #Bolivia might have a sovereign default soon due to diminished #energy exports (gas mostly)
on 02024-12-23#news #video from Russian propaganda channel #Firstpost quotes the NYT quoting Vivek Ramaswamy promising “#Milei style cuts, on steroids” in #USA #politics under #Trump, but says “Milei-nomics” has “pushed 5 million people into poverty”
on 02024-12-23#video in #Italian on #bootstrapping a metal-melting oven with a methane burner made from gas pipe and wire and teflon tape. Demonstrates a hand-driven aluminum hole saw cutting a large circular hole through insulating refractory.
on 02024-12-22#news #video about #Milei feuding more publicly with #Villarruel, but the actual quote is very dog-whistly. Touts a new US$400 million Stellantis investment. #Argentina #politics
on 02024-12-22#timelapse #video of plants growing (date palm, pine tree, kiwifruit plant, oak, pea, ghost pepper, potato, mango, carrot, ginger, purple bell pepper, zucchini, tomato, dragonfruit, basil, peanut, durian, oyster mushrooms, reishi mushrooms, starfruit, lemon, etc.) #botany #gardening by "BoxLapse"
on 02024-12-21#news #video from #La-Nacion affirming that poverty and inflation are much lower now
on 02024-12-21#news #video #politics on the #USA withdrawing a bounty on the arrest of the new head of #Syria #toread
on 02024-12-20another #openEMSstim #video on #TENS #neurostimulation, this one from Hasso Plattner Institute HCI. The off-the-shelf stimulator, a “TNS SM2 / MF” made by Pierenkemper GmbH, runs off a 9-volt battery and delivers 70mA on I guess each of two channels; three potentiometers offer control, including two supposedly calibrated in mA and one in Hz. He demos stimulating the palm flexor muscle; at 10mA his hand contracts. The electrodes are sticky and come on a plastic pad that permits reusing them without having to apply gel. #electronics #hardware
on 02024-12-20#video about "openEMSstim" #electronics #hardware for #TENS and similar #neurostimulation. Apparently it can communicate over #Bluetooth #BLE. At 6'20" he’s demonstrating controlling his arm from an Android phone.
on 02024-12-20another #video of a #Milei speech, 80 minutes at some kind of dinner, I guess in Tucumán at a meeting of “Federalismo y Libertad”. He says, among other things, that the poverty rate has fallen from 54.8% in the first quarter 02024 to 38.9%, while indigence fell from 20.2% to 8.6%. Says the economy is expanding at a 10% annual rate, which sounds like he thought 16.5% was too high to be credible but still wants to use quarter-to-quarter GDP growth rates (he does say “17% anual” when talking about the 3Q figures). “El consumo viene creciendo a un ritmo del 20% anual; decían que no iba a haber inversiones” (I’m guilty on this point) “y las inversiones vienen volando al 50% anual.” Claims his administration is the best administration in the history of #Argentina, ew. Says that when he assumed power the “salario básico” was 300 dollars [per month] and now it’s 1100 dollars [per month], which I think is roughly correct, and unemployment is down to 6.9%. Also talks about covering 100% of the “canasta básica”, a potential free trade treaty with the #USA, etc. Described the Ministry of Women and the INADI as “organisms dedicated to persecution of those who don’t take Communion from the Left.” Refers to the Kirchnerists as “the cockroaches”, “las cucarachas”. “Las bases del capitalismo de libre empresa están en la cultura judío.” Opposes Israel to the “collectivist agenda”, apparently unaware of the kibbutzim. #politics
on 02024-12-20#news #video of #Milei this afternoon announcing his new #nuclear #energy plan for #Argentina, starting with the construction of an SMR, apparently unaware of the solar-energy revolution that’s taken place over the last year, along with the ridiculous fantasy of manufacturing SMRs for export. What an embarrassment. It’s useful to see what kind of patriotic rhetoric they use to sell this white elephant. The second speaker is Rafael Grossi, who was the Argentine ambassador to Austria before becoming the head (Director General) of the #IAEA. Rossi, hilariously, says nuclear energy “es una herramienta que la Argentina ha usado en los últimos 70 años con marcado éxito”, not daring to mention anything that suggests Huemul. He does eventually dare to mention nuclear weapons at 8'52”. Milei finally starts speaking at 10'16”. His list of technological revolutions: fire, the wheel, the loom, the steam locomotive, electric energy, and the internet; he says today artificial intelligence opens a new frontier in this Manifest Destiny that we share as a species, which will require more energy than conventional energy — but somehow completely forgets to mention solar and wind energy. #politics
on 02024-12-20#video of 01974 "Tank" Atari arcade game. #retrocomputing #games
on 02024-12-20#video #news #toread #interview with Luis Caputo published by the Ministry of the Economy #politics #Argentina
on 02024-12-18#news on polls on #Milei’s popularity, 52% approval. The #video is almost pure talking-head filler. #La-Nacion #politics #Argentina
on 02024-12-18#news #video from Radio Mitre #interview with Jaime Campo, the president of the Asociación Empresaria #Argentina, on his meeting with Luis Caputo, who says the priority is reducing the tax burden on the economy, while the cepo will last a while longer. The video is pure talking-head filler. #politics
on 02024-12-18#humor #video of “Breaking Up With Overly Attached Girlfriend”
on 02024-12-17#video of right-wing Fox #news using #Milei as an example for #USA #politics
on 02024-12-17#video #news: #Milei betting on #nuclear #energy. Doh! #politics
on 02024-12-17#humor #video about the creepily smiling girl in the house fire photo, who it turns out is named Zoë Roth.
on 02024-12-17#news #video about how #Milei (or rather his political ally Jorge Macri) is instituting a US-like policy of sending the police to beat up homeless people and stealing their possessions. Currently there are supposedly 4400 homeless people in Buenos Aires (presumably this means the city), 10% more than last year and 2.5× as many as five years ago. #politics #human-rights #Argentina
on 02024-12-17#news #video on Argentine policeman #Nahuel-Gallo being imprisoned in #Venezuela when he tried to visit his wife and child, who live there with her family; in response, Patricia Bullrich (the minister of security of #Argentina) called Diosdado Cabello (the Venezuelan minister of the interior) “el lacayo de una dictadura criminal y cobarde. (...) La argentina no se somete a tiranos.” So it’s an international incident. #politics
on 02024-12-17#news #video with #economics #statistics about #Argentina: +3.9% GDP in the third quarter of 02024, -1.7% the previous one, -2.1% the one before that, and -1.9% from the last quarter of 02023. That still leaves us 2% below the last quarter of 02023. The talking head in the video, however, says it leaves us 0.1% below. It seems like this is a combination of calculation errors (maybe he’s naïvely adding percentages instead of multiplying, or maybe I’m using incorrectly rounded numbers) and not counting the -1.9%. He also says that the quarter-on-quarter growth in construction activity was 6.9% and in industrial production was 13.6%. The year-on-year figures he shows seem to show a dismaying backslide towards a resource-extraction economy: 32.0% growth in agriculture, 7.3% growth in mining, 7% growth in fishing, 2.9% growth in hospitality [...] and a 10.7% drop in manufacturing and a 14.9% drop in construction. Which I guess are the sectors that rebounded most sharply in this last quarter. And apparently last year there was a drought.
on 02024-12-17#news #video with a bunch of talking heads discussing #Milei’s #economics tweet (“Sigan llorando econochantas de mandrilandia”) that the #Argentina’s GDP went up 3.9% from the second quarter to the third quarter, which would be an unheard-of annualized 16.5% growth if it were true, following the earlier fall (which a talking head incorrectly says was 3%). Apparently the central bank has bought US$3.5 billion in dollars from private companies in the last 2½ months, increasing its reserves. And the riesgo país is below 700 basis points (7%) for the first time in a long time.
on 02024-12-17#news #video with a bunch of #economics talking heads arguing about what it means that #Argentina’s inflation is now down to 2.4% per month.
on 02024-12-17#video #toread about telephone switches. #electronics #history
on 02024-12-15#calisthenics #video on a pistol squat progression
on 02024-12-15#video from #Summer on a pistol-squat #calisthenics progression
on 02024-12-15#video by #Xyla-Foxlin introducing her #rocketry kit and showing her friend Caeley getting L2 certified with it by NAR
on 02024-12-14#video on a rocket cooking meat with aerobraking heat. Unfortunately the 3XL condom was too small for his meat rocket, so he had to use normal mold release. Which didn’t work, so he was able to get the condoms to work on a second attempt with better lube. #rocketry #humor
on 02024-12-14#video on #bootstrapping "Neurostimduino" #TENS and EMS neurostimulation unit with a 25mA current limit on each channel. One-minute ad. #electronics #hardware
on 02024-12-14#video on #bootstrapping #TENS #electronics from what looks like a 555 and a 9-volt battery and some aluminum foil. #toread
on 02024-12-14#TENS #electronics #bootstrapping #video with a 556 timer and a power transistor on some perfboard in a painted wooden box with some pots and a couple of stainless steel paddle electrodes. Just photos.
on 02024-12-14#video on #bootstrapping #TENS sponge electrodes made from aluminum foil and baking-soda water
on 02024-12-14#video #interview with #Steven-Wright by Joe #Rogan
on 02024-12-13#video #news of people coming from #Argentina to visit the graves of fallen soldiers in the #Malvinas
on 02024-12-13#video of George #Carlin #humor on airline announcements using unnecessary words so the people saying them can feel more important
on 02024-12-1327-minute #video on #Unix from 01982 from the AT&T Archives #history
on 02024-12-13#Kurzgesagt #news #video about #Ukraine, etc. Is the world getting more peaceful?
on 02024-12-10#video from "Economics Explained" on #Milei consisting almost entirely of stock-footage filler with a relatively #vapid voiceover outlining #Argentina’s past with error-filled subtitles. #Plonk.
on 02024-12-10#video pullup progression: scapula retraction, pullup on tiptoes,... #exercise #toread
on 02024-12-10#video #Chinese I like Chinese food #toread
on 02024-12-10#news #video mentioning #Syria coup and a #Trump #interview
on 02024-12-09#video #toread by #Wes-McKinney on making open-source software a “true vocation”
on 02024-12-09#video #toread on #RAG #neural-networks with Langchain and Llamaindex, showing some example code
on 02024-12-09#Summer is 20.1% body fat, 2σ below the mean, and tried creatine to see if it helps or hurts with #calisthenics. She got dehydrated for a week! Then in the second week she had to sleep more. She didn’t have any muscle or strength gains within three weeks, but did see bulk gains, and had a hard time swimming and walking up stairs due to weight gain. She recovered in weeks 5 and 6 and started to notice striations. According to the body scans her lean mass increased 1.5kg, and apparently not any extra water, and her muscle mass went from 57.3kg to 59.5kg. And she saw massive gains in strength on the exercises she was focusing on, such as tuck planche pushups and front levers. Comments point out that creatine might have an especially large effect on her because she’s a vegan. #exercise #video
on 02024-12-07#Summer #exercise #video showing a progression to pullups including a “pullover”. #calisthenics
on 02024-12-07#video on #explaining, #Summerfunfitness talking about pullups and in particular archer pullups and fun little dances.
on 02024-12-06#video on #exercise, #Summerfunfitness explaining how to work up to being able to do a pullup by doing negative pullups, and doing a pullup every time she went in and out of her bedroom. She does six reps for three sets, making the reps more difficult rather than doing more reps, but says it’s because she doesn’t enjoy doing high reps of pullups.
on 02024-12-06#video about how #Steven-Seagal lied about some of his qualifications but legitimately bribed people to get others, and also got involved with the #Mafia, and allegedly sexually assaulted one of his employees and held her prisoner in his house.
on 02024-12-06#video #toread #interview with #Steven-Seagal at his luxury hotel suite in #Dubai. He spends a lot of time bragging about what he knows, but then spars with the interviewer.
on 02024-12-06#video channel of the Joe #Rogan “podcast”.
on 02024-12-06#video on how #China launched the first 18 #Qianfan satellites on August 6. Also mentions OneWeb and Telesat. Qianfan plans to have 108 satellites up this year, 648 next, 1296 in 02027, and 15000 in 02030. #Xingwang, according to an ITU filing in 02020, plans to have 1300 satellites deployed in 02029, 6500 in 02032, and 13000 in 02034.
on 02024-12-06#video on #SpaceX. Mentions that a recent Falcon 9 launch from launchpad SLC-40 at Cape Canaveral broke the record for the fastest turnaround time: 13 days and 12 hours to reuse the booster. Also mentions Rocket Lab as another company working on reusable spaceflight, with #space rockets Electron (already providing launches but not reusable) and Neutron. But ABL Space Systems is abandoning the commercial space launch market, following Virgin Orbit and Relativity Space. Also there’s Astra. Somehow completely fails to mention ULA or any of the rocket companies in China.
on 02024-12-06#video on #China’s eight most promising reusable #space rocket companies: #LandSpace (whose #ZhuQue-3 is powered by TQ-12As), iSpace (whose Hyperbola-3 is powered by Jiaodian-2s), Galactic Energy (whose Pallas-1 is powered by Cangqiong-50s), CAS Space (whose Lijian-2 is powered by YF-102s), #Space-Pioneer (whose Tianlong-3 is powered by Tianhuo-12), Orienspace (whose Gravity-2 is powered by Yuanli-85s), Deep Blue Aerospace (whose Nebula-1 is powered by Leiting-1Rs), and SAST (whose engine is called Longyuan). SAST (the Shanghai Academy of Space Technology), LandSpace, and iSpace are using methalox, while the others are kerolox. Seven of these (excluding Deep Blue Aerospace) already have regular launch income from disposable rockets, mostly solid-fueled. Also Long March 10 (which I think is made by the government) is going to reusable boosters and is going to be trying to catch them in a sort of crisscross of movable tethers. China plans to launch two Starlink-like megaconstellations called #Qianfan (by Shanghai Spacecom, 15000 satellites) and #Xingwang (by China SatNet, 13000 satellites).
on 02024-12-06#video of the first successful (10km) vertical-takeoff, vertical-landing flight by the first stage of #China’s LandSpace’s #Zhuque-3 (朱雀三) on September 11. “ZhuQue-3 is a partially reusable, liquid oxygen and liquid methane (LOX+LCH4) powered, launch vehicle developed by #LandSpace Technology Corporation (蓝箭, Blue Arrow). According to the company, the test was conducted with a single-stage liquid oxygen/liquid methane rocket, with a diameter of 3.35 metres and a length of 18.3 metres, made from the same high-strength stainless steel airframe structure that will be used on the ZhuQue-3 rocket.” But 3.35m is less than the 4.5m diameter of ZhuQue-3.
on 02024-12-06#China #video on #Zhuque-3 (朱雀三) reusable #space rocket 10 months ago, built by private space exploration company #Landspace, fueled by lox and methane. 9 1000-kN (100-tonne) TQ-12B engines, 76.6m tall, 4.5m diameter, 21.3 tonnes (?). Second stage has a single TQ-15B engine blowing 1183kN at 3500m/s. Looks very, very similar to a #SpaceX Falcon. Slogan: “The key to freer access to space.”
on 02024-12-06#China reusable rocket #CGTN #space #video #ZhuQue-3
on 02024-12-06#China is landing (well, “landing”) reusable rockets on fold-out landing legs like #SpaceX, according to Chinese state government TV channel. This seems to be the Deep Blue Aerospace Nebula-1, reaching 10km altitude. #CGTN #space #video
on 02024-12-06#exercise #video showing pushup variations ranked by difficulty: wall pushups, incline pushups, knee pushups, negative (eccentric) pushups, regular pushups, diamond pushups, decline pushups (with your feet on a box), ring pushups, spiderman pushups, knee to elbow pushups, sphinx pushups (with upper arms initially vertical), archer pushups (with one arm straight), clapping pushups, pike pushups, planche lean pushups, handstand pushups (with your toes on a wall), tucked planche pushups (between parallel bars), one-arm pushups, free handstand pushups, tigerbend pushups (hard to explain), 90° pushups (on pushup handles, starting horizontal and raising to handstand position), planche pushups (same without the handstand, using a straddle planche). #calisthenics
on 02024-12-06#exercise #video showing common deviations from proper pushup form. Points out that “archer” pushups form a continuum of difficulty. #calisthenics
on 02024-12-06#news #interview #video yesterday with Sergey Lavrov, 81 minutes, about the #Ukraine war, by the notorious right-wing ideologue from the US, which I linked yesterday from the ideologue’s channel; this is the channel of the Ministry of Foreign Affairs of Russia.
on 02024-12-06#news #interview #video today with Sergey Lavrov, 80 minutes, about the #Ukraine war, by a notorious right-wing ideologue from the US, discussing #Oreshnik
on 02024-12-05#scouting #humor #video of Boris cooking with brick
on 02024-12-05#video of Noam #Chomsky warning about the end of organized human life due to #global-warming
on 02024-12-05#video of a debate betwen #Al-Jazeera journalist Mehdi Hasan and Victor Gao, diplomat for #China and former interpreter for Deng Xiaoping, describing Chinese military policies, including the proposal to expel people of Japanese descent from #Taiwan if they refuse to pledge loyalty to the PRC. Also speaking are Stephen Chan, Martin Jacques, and Rayhan Asat (a Uighur whose brother was forcibly disappeared eight years ago). Extremely tough criticism of the PRC’s policies. Hasan really demolishes Gao’s position, but interestingly the headline question of whether China is “on a path to war” is barely touched on. The things Gao admits are even more interesting than the things he denies.
on 02024-12-05#video #humor of George #Carlin on the penultimate Ed Sullivan show in 01971 on Muhammad Ali and environmentalism. #politics #history #USA
on 02024-12-04#video of the first 12 minutes of MTV. #history
on 02024-12-04#video #interview with #Jonestown survivor #Odell Rhodes. A comment says he died in Sacramento, CA, in 02014, at age 72. #USA #Guyana #history #politics #crime #cults
on 02024-12-04#video #toread #interview by global-warming denier Candace Owens with former #CIA agent and purported whistleblower Kevin Shipp. #USA #history #politics
on 02024-12-04#video of George #Carlin on the first episode of Saturday Night Live and his cocaine use
on 02024-12-04#Ziroth #video on #ornithopters #drones, mostly talking-head filler with stock footage, but some of the stock footage is from ornithopter research groups. Mentions that a Chinese homing-pigeon drone had a record flight time of three hours, presumably on batteries.
on 02024-12-04#video on colloidal crystal #materials (#metamaterials like opal), just an #interview with Sharon Glotzer of UMich
on 02024-12-04#video on #manufacturing #mechanisms for recycling aluminum cans into flat metal sheets, using two rolling cutters similar to the cutter on a can opener.
on 02024-12-04#video #interview of former mob boss Michael Franzese about #crime in movie scenes
on 02024-12-04“Murder is ugly.” —former mob boss Michael Franzese on why he doesn't like to talk about murdering people in this #crime #interview #video. Describes the Mafia’s recruit training system.
on 02024-12-04#news #video of the end of martial law in South #Korea after five hours or so
on 02024-12-03#video of a starling mimicking speech and R2-D2
on 02024-12-03#video of 10-gram 330-mm-wingspan Bionic Bird "MetaBird" powered by a 1.6-watt motor powered by a 1.6-gram battery, designed by Edwin Van Ruymbeke, XTIM, 77 Rue de Lyon, 13015 Marseille, France. Annoyingly half the video is taken up by stock footage of disaster relief. #ornithopters #drones
on 02024-12-03#physics #video of “impossible” Brennan torpedo powered by pulling a cable out the back to drive its propellers
on 02024-12-03#video #toread on eliminating lathe #machining tailstock quill play
on 02024-12-0337-minute #video #toread on 100 #Chinese verbs
on 02024-12-03#video supposedly on the most important #Chinese phrases, but seems to be total bullshit because these are not common phrases and furthermore seem to be speech synthesis output. From "Mandarin Chinese College". Plonk.
on 02024-12-03#video #toread #Chinese practice sentences for talking with friends
on 02024-12-01#video #toread HSK5 #Chinese practice with stories
on 02024-12-01#video on Vidalia onions #formina including onion flower footage, explaining that what makes the Georgia soil special is its sulfur deficiency
on 02024-12-01#video of supposedly “first” geared #CVT #mechanisms. Very complex and confusing. The design is "RatioZero" by Edyson Pavilcu, who is looking for investors. Uses variable lever arms implemented via slots in rotating gears. And apparently a one-way freewheel or ratchet mechanism on other gears (the current design uses a literal clicky ratchet and pawl). But ratchet-based CVTs have been known for a century. This one uses elliptical gears to reduce (but not eliminate) the torque ripple that plagues ratchet-based CVTs.
on 02024-12-01#video #toread on #Chinese common phrases. 36 minutes
on 02024-12-01#video #toread of #Uri-Tuchman #manufacturing rose engine ornamental lathe #mechanisms for #machining guilloché
on 02024-12-01everything you need to know about #Chinese pronunciation in under an hour, starting with the “problem initials”, z c zh ch sh r j q x. #video #toread
on 02024-12-0150 basic #Chinese phrases, level 0 #video #toread
on 02024-12-01#video #toread How to answer “Can you speak #Chinese?”
on 02024-12-01Basic #Chinese phrases in one minute #video #toread
on 02024-12-01#Chinese #video #toread beginner lesson including “I can speak a little Chinese”
on 02024-12-01#Chinese #video #toread practice, HSK 1–2, 28 minutes, such as “Can you speak Chinese? A little bit.” “Sorry, can you speak slower?” (Seen it once, need to repeat)
on 02024-12-01#video playlist #toread #Chinese listening comprehension quiz for absolute beginners
on 02024-12-01#Chinese #video #toread practice: 100 daily conversations part 1, 17 minutes
on 02024-12-01#video #toread #Chinese listening comprehension for super beginners recorded by professional voice actors, 56 minutes
on 02024-12-01#Chinese #video #toread HSK 1 listening comprehension, 18 minutes
on 02024-12-01#video by #We-can-do-that-better about #manufacturing a 26mm-diameter four-jaw lathe chuck. Demonstrates #machining soft jaws for a three-jaw chuck (each secured by two recessed screws) to perfectly grip the outer diameter of the small chuck, then reversing the soft jaws to cut a different radius on their other end. They use M3 triangular threads cut with taps and dies. It never occurred to me before, but some lathe chucks are like bloodworms in that they have four jaws. Brass locking pins Loctited into the back of the chuck hold the chuck screws in place by entering into undercuts in the middle of the chuck screw threads. Uses “poor man’s internal broaching” with a square broach ground from a broken tap to make square holes to drive the chuck screws with. 19 parts in all, almost all cut from a stainless bolt.
on 02024-12-01#Blondihacks #video #toread on #manufacturing a tool sharpener, part 2. #machining
on 02024-11-30#Blondihacks #video #toread on #manufacturing a tool sharpener, part 1. #machining
on 02024-11-30#Blondihacks #video #toread on #manufacturing a tool sharpener, part 5. #machining
on 02024-11-30#video #toread reviewing the Art of #Electronics lab manual book
on 02024-11-29#video rebutting the #Deutsche-Welle reportage on #Milei I linked earlier, but it’s just some talking head
on 02024-11-28#video #forgreg on #solar #photovoltaic sun tracker using his design (but three years earlier) using #3D-printing
on 02024-11-27#styropyro #video on old #fireworks banned in 01966
on 02024-11-27Press-conference #news #video on #Mexico’s #energy plan for 02024–02030, saying they had to rescue #PEMEX after the failure of the “neoliberal period” as a product of the privatization of 02013, after which it supposedly became the world’s most indebted #oil company; apparently López Obrador rescued it in 02018, but apparently they didn’t renationalize it until #Sheinbaum did so 15 days ago? Currently producing 1833 thousand barrels per day, almost unchanged since 02019 (3400ℓ/s; at 37MJ/ℓ that’d be about 125GW), and 3754 million cubic feet of #gas per day (1.23Mℓ/s; at 37kJ/ℓ that’s 46GW). Interestingly they give lip service to promoting the energy transition, but the press conference is all about increasing fossil-fuel production and use.
on 02024-11-27#Sky #news propaganda #video opposing #solar #photovoltaic #energy. Shows the nameplate of a house-sized Mitsubishi Hitachi hydrogen-cooled steam turbine generator (310RK09-776-1) producing 3-phase 20kV at 50Hz and what looks like 17984 amps, saying it produces 570–580MW, though my calculation gives 360MW from those numbers. Shows a real-time power price of [AU?]$235, presumably per MWh, attributing the high price to a cold snap in Victoria. Says 1200 tonnes of cheap brown coal per hour produces 1140 megawatts electric, which works out to 3.4MJ/kg, which would be about 15% efficiency, which seems improbably low. “[In the past] you were seeing wholesale prices around (...) $20–40/MWh”, says a guy who’s been working in the field for only 30 years; that also seems improbably low. “10 Australian coal-fired power stations closed in the last decade. There are 15 still running, but most are slated to close in the next decade.” 62% of electric generation on #Australia’s main grid is from fossil fuels, the other 38% from renewables. At 7'51”, it profiles Belinda Jones, a pensioner who’s paying AU$1073.31 per month (US$697/month) because she’s paying AU$0.191/kWh for 3410kWh (AU$651, becoming AU$716.63 after GST) and AU$0.216 for 2700kWh (AU$582, AU$640.10 after GST), from which subsidies are deducted. That implies her house is averaging 8400 watts! Possibly in part because she’s using resistive space heaters instead of heat pumps, but more likely it’s not actually a one-month bill — yes, in fact, at 9'13” we see it’s for 92 days, but she’s still averaging 2800 watts around the clock. (The average comes out to 11.4¢/kWh, which is very cheap by retail standards.) Also, we see at 9'22” that the previous bill was only AU$457.45. A different power bill shown at 45'04” shows someone paying $415 with time-of-day billing — also for 92 days. “Energy scarcity emerges everywhere #wind and solar become the dominant form of electrical generation.” Shows the #LNG export gas terminal at Gladston, the Petra Nova #carbon-capture pilot plant in Houston, and a US$21B #nuclear power plant in Georgia, the second to be built in the #USA in the last 30 years. #Microsoft has signed a deal to reopen #Three-Mile-Island. #politics Viper-7 reports paying 27.56-67.44c/kWh: Peak time (4:00pm to 7:59pm): 67.44c per kWh; Shoulder time (7:00am to 3:59pm, 8:00pm to 9:59pm): 29.65c per kWh; else 27.56c per kWh, including GST.
on 02024-11-27#news #video nine months ago from #Deutsche-Welle on #solar #manufacturing in #Europe, for example by #Switzerland company #Meyer-Burger in #Germany, which is opening a new factory in #Colorado-Springs, #USA. Credits national #China policy prioritizing #polysilicon production in the early 02000s. Lots of talking-head filler by Richard Black, director of policy and strategy at #Ember. Says #Brazil is “leading the renewable #energy boom taking place across the continent”, but apparently is trying #import-substitution with tariffs, and #ABSOLAR isn’t convinced local producers are enough. Says #Trump plans to cut Biden’s US subsidies. “Today, solar-powered energy is the cheapest form of electricity for the majority of the countries that use it. (...) Estimates put the cost somewhere between 300 and 900 dollars per kilowatt by 2030.” I guess when they made this video the mainstream solar module price was €0.14/Wp, and now it’s 29% lower at €0.10/Wp (US$106/kWp). Panasonic and LG recently exited the market. #photovoltaic
on 02024-11-27#video of Claudia Sheinbaum of #Mexico describing an #import-substitution project they’re trying to do to reduce the trade deficit with #China. Says Mexican cars exported to the US are only 7% Chinese, while US-made cars are 9% Chinese. Says that globalization is out of favor since the pandemic. Mexico imports supposedly US$211 million from China, while the US imports US$1080 million from China. #economics
on 02024-11-27#video of a panel discussion (or maybe series of prepared monologues) among #USA military experts on #China, starting with the Century of Humiliation, showing the Map of National Humiliation (or Shame) from 01938, likening Xi’s Belt and Road Initiative to the Ming Treasure Fleet of Zheng He. “The capability gap [between the Chinese and US military] is rapidly shrinking, both in the air domain and in the space domain. Given a little bit more time, it’s plausible that the PLAAF will outstrip the USAF in terms of numbers.” Also: “#SpaceX has dramatically reduced the cost of launch,” mentioning the “commercial augmentation space reserve,” similar to the Civilian Reserve Air Fleet (CRAF). There are 6500 Starlink satellites out of 7000 total US satellites. “The first law of war is to preserve yourself and destroy your enemy.” —Mao. Predictions that the South China Sea will be a bigger flashpoint than #Taiwan because Taiwan isn’t a US treaty ally. Chinese anti-ship missiles have been combat-tested by the Houthis against international shipping in the Red Sea; they work. Panelists believe that displacing the US dollar with a new international reserve currency (based on a basket) is the biggest threat from BRICS, and could insulate the PRC from the US’s ability to “impose sanctions as an instrument of national power”. A recommendation to watch Chinese movies Wolf Warrior I and Wolf Warrior II, after which Xi’s “wolf warrior diplomacy” are named, to understand how the Chinese see a potential conflict with the US. Discusses the Shanghai Cooperation Organization (#SCO), a “wannabe equivalent to NATO”. “10 years ago there were like 6–7000 PLA soldiers [in UN peacekeeping missions] around the world, especially in Africa. (...) It has gone down.”
on 02024-11-27#news from #Bloomberg on semiconductor #manufacturing in #Japan, where #TSMC begins mass production later this year following US$4.86 billion in subsidies to expand their Kumamoto plant announced in February. And Japanese startup #Rapidus plans to ship 2nm chips in 02027 with 590 billion yen (US$3.9B) in subsidies. And Japanese startup #Preferred-Networks supposedly has 7nm #neural-networks accelerator chip MN-Core 2, though presumably fabbed overseas by TSMC; their marketing is focused on energy efficiency and thus “sustainability”, and “is confident in bringing its AI chip design and supercomputer to market in a few years time”; they’re hoping Rapidus can fab their chips. 40%–50% of demand (as seen from Japanese semiconductor company Screen Holdings) comes from #China, especially the auto industry. An annoying amount of stock-footage filler. Much of the #video is about #JASM (a TSMC joint venture with Sony and Denso), which is “planning to begin mass production soon”, and its facility in Kikuyo.
on 02024-11-27#video of a talking head claiming electrical #energy #pricing in #China is about 15¢/kWh, even though 20 years ago China was considered energy-poor. Also China consumes 26% of world energy (which would be about 5 TW), 55% of world coal (to India’s 12% and #USA’s 5%), and 15% of world oil (to the US’s 20%), according to the Energy Institute. Apparently the Chinese call their ultra-high-voltage #HVDC transmission lines a “Shinkansen for power”. The video author seems to be confusing HVDC with AC transmission. Claims #Brazil’s Belo Monte phase II HVDC transmission line is operated by the State Grid Corporation of China!
on 02024-11-26#video #formina of 19th-century firearms at half power
on 02024-11-26#video by #China propaganda outlet SMG (Shanghai Eye) on 550-hectare #solar #photovoltaic farm in #Azerbaijan, in Gobustan, 60km southwest of Baku. Construction started in April of last year by #Dongfang Electric Corporation. Surprisingly, it uses solar trackers, so it may be able to get above-average capacity factors. Says it produces 500 million kWh of electricity annually (57 megawatts). Seems to be a pretty desert-climate site, but the total absence of vegetation (in contrast to the dry grass nearby) suggests it’s been bulldozed. The timelapse of construction doesn’t seem to show much in the way of concrete foundations, though the main control building is reinforced concrete with brick infill. Later (?) shots show vegetation has returned around the footings of the panels.
on 02024-11-26#video by #Titans-of-CNC on #3D-printing with #binder-jetting, profiling a job-shop company in Ann Arbor named Azoth Digital Metal (Azoth being the alchemical universal solvent). The Markforged “PX-1 odger” (?) printer they like most can do up to 90kg in a single run, using 70400 nozzles each depositing 2.1 picoliters of binder at 15.5kHz, using air bearings and linear motors, as explained by Markforged’s bizdev manager for metal binder jetting, Ross Adams. Markforged’s technical director Hans Kimblad was also for some reason onsite, and also their president and CEO, Shai Terem. They’re printing small parts like firearm mag[azine?] releases, saying it’s much cheaper than machining but more expensive than metal injection molding. They’re also 3-D printing seatbelt parts that then get chrome-plated. They say they can hold tolerances of “plus or minus about three thou” on small features, ±75μm, “five thou would be typical”, and presumably even worse for large features: “I give people a 1% rule,” so a 400mm dimension would be ±4mm! “It’s a small complex metal part technology. So really I’m focused on parts 120mm in the longest direction, or smaller.”
on 02024-11-26#video of right-wing video game streamer #Asmongold commenting on (and kind of endorsing) #Trump’s mass #deportation plan #USA #politics
on 02024-11-26#news #video on #Israel prime minister #Netanyahu releasing a video calling leaders of the Army “traitors” for hiding information about Hamas strategy (?)
on 02024-11-26#news #video on a 1-gigawatt #solar #photovoltaic offshore farm in Shandong, #China, consisting of 2934 solar platforms built on steel trusses, connected with 66kV transmission. Predicted production would be 1.78 billion kWh/year, which is 203MW, a 20.3% capacity factor, which I think is roughly double the Chinese average. I wasn’t expecting this for 20 years. #energy
on 02024-11-26#news on the #EU imposing 35.3% punitive import #tariffs on electric vehicle (EV) imports from #China earlier this year on top of the 10% standard import duty (and I suppose VAT). China ended its joint-venture rule in 02022, maybe due to #Tesla, while the EU is maybe enacting it as a way to, in effect, drop the tariffs. This #video (by #EV-Insight) is pure irrelevant stock-footage filler. #politics #EVs
on 02024-11-26#news #video saying last night at least 17 Russian drones hit #Ukraine out of a total of 188, of which 76 were shot down and 95 lost from radar tracking for unknown reasons. Also 4 Iskander-M ballistic missiles were fired, but apparently no more #Oreshnik missiles. Odessa recently had a multi-day power and drinking-water outage, and attack-induced blackouts are common across Ukraine.
on 02024-11-26#news #video on the December 24 elimination of the 7.5% impuesto PAIS tax in #Argentina and the immediate elimination of its withholding (presumably for imports after that date), following its reduction from 17.5% in September. This will also lower the dólar tarjeta exchange rate for credit-card #forex exchange. The bienes personales tax is also being lowered (how much?) and its non-taxable minimum increased (how much?) and the real-estate transaction tax (impuesto a transacción de inmuebles) also eliminated. But the impuesto a exportaciones still survives!
on 02024-11-26right-wing #news #video claiming #UK export controls to Russia over the #Ukraine war have been ineffective because the same exported goods are just flowing in through neighboring countries in the Caucasus and central Asia such as Georgia and “what we would see as the Stans”, while UK luxury car exports to those same countries have “skyrocketed”, “particularly #Azerbaijan”. #Clickbait headline promises information on an announcement of new sanctions, but no such information is available. Fuck you, Sky News.
on 02024-11-26#clickbait #video on #solar #energy claiming #China is “no longer approving” coal power plants. Talking-head filler interspersed with web-page screenshots and misleading stock footage (e.g. of concentrated solar power to illustrate a #photovoltaic plant). Claims #Australia will build an even larger solar farm than China’s at, implicitly, Crescent Dunes within the next 5 years. Claims 210 gigawatts of renewables added so far in 02024 (as of November 19, according to a Renew Energy reneweconomy.com story) of which 161GW was grid-scale solar, 39.1GW of #wind power, 7.97GW of hydroelectric, and 1.37GW of biomass, and that coal power plant approvals have fallen 80% according to Greenpeace, or that last year approvals for new coal power plants fell by 92%, or that over the first 9 months of 02024, an increase of 21% over last year; “86% of all power added to the Chinese grid was renewable energy” (unclear if peak or average). Claims that the average [residential?] solar [power] system being installed in #Australia now is 10 kilowatts. Claims that 70% of coal power plants are running at a loss, and that coal power plants need to hit a 70% capacity factor [in what country or countries?] to be profitable. Claims that China shuts down its coal power plants during the day, which seems unlikely to me. Claims that at the end of the third quarter this year, “China’s renewable energy generating capacity had reached 1.73 terawatts, a year-on-year increase of 25%.” Confusedly claims that the difference between the 25% increase in total renewable energy capacity and the 21% increase in the pace of renewable energy installations results from installing batteries and therefore improving the capacity factor of solar, but of course there is not particular reason why these figures ought to be close (it just indicates that growth is nearly exponential) and both numbers are nameplate capacities into which the batteries don’t figure at all. Claims China has installed more solar than the rest of the world combined this year, which is of course true. Claims Tesla’s installation of [utility-scale?] batteries this year is double that of last year, and that they have a two-year backlog of orders.
on 02024-11-26#news #video on #China last month issuing sanctions against 8 US arms companies, including Lockheed Martin, and 10 of their executives, including David Sutton, Lockheed Martin’s Director for Asia. “Internal reviews revealed that even the F-35’s ability to fly was actually built on the covert use of Chinese-made parts.” Covert? According to a report by Lee Hudson at Politico in 02022, yes, an alloy used in magnets in the turbomachine pumps, as notified by the Defense Contract Management Agency. The Warzone had an article saying, “F-35 deliveries halted after Chinese alloy discovered in key component”. Since they replaced this part, there have supposedly been a rash of in-flight failures resulting in seven F-35 crashes. However, the two of these crashes that have been linked were caused by a VTOL failure, not the integrated power package turbomachine, so the suggested connection is baseless. From Chinese propaganda outlet #Wave-Media.
on 02024-11-24#news #video on #China consumer sentiment being low and hitting foreign brands especially hard this year. Lots of Chinese supermarket footage.
on 02024-11-24#news #video on #China seabed #espionage surveillance devices described as “underwater lighthouses”, following a similar discovery in 02019 by 11 Chinese fishermen in Jiangsu, and another discovery of 9 such devices in 02018 by 18 fishermen in Jiangsu, and China’s recovery of an underwater drone in 02015; reporting by Russia propaganda outlet WION. #politics
on 02024-11-24#news #video saying Rand Paul will chair the Homeland Security committee next year and will not support the use of the military in #Trump’s planned deportations. #USA #politics
on 02024-11-24#news #video #interview with new prime minister of #Malaysia about China, Israel, Ukraine, etc. #politics
on 02024-11-24#news #video by Russian propaganda mouthpieces Danny Haiphong and Scott Ritter on the #Oreshnik strikes on the former Yuzhmash factory in #Ukraine; says there were six releases of six submunitions each. Mentions SCALP, the French missile. Pure talking-head filler
on 02024-11-24right-wing #USA propaganda #news #video saying South Korea is thinking about getting involved in the #Ukraine war #politics
on 02024-11-24#news #video from CNN criticizing Biden’s #USA #politics policy change on #Ukraine
on 02024-11-24#news #video showing "Chachos" in La Rioja, a new kind of #Patacón with a 1:1 exchange rate to pesos
on 02024-11-24#video on paper conservation for #archival with humidification chambers, aqueous aerosols, vapor-permeable membranes, and alcohol sprays. #CC BY-SA from a “Jigsaw Teaching” project
on 02024-11-24#video of #Bernie-Sanders #interview with #Lex-Fridman #USA #politics #history
on 02024-11-22#video of #Milei #interview with #Lex-Fridman #Argentina #politics
on 02024-11-22#TRT #news says Erdogan calls for “restraint”, seeming “very, very concerned” and saying NATO “needs to prepare”, and “opposes #Ukraine’s use of US long-range missiles”, which #Turkey calls a “mistake”. Also an interview with Sergey #Karaganov, advisor to Putin. He also says that under [circumstances I didn’t understand] the #USA and Western Europe would “get a nuclear response”. Former Turkish diplomat Gulru Gezer says she’s getting “chills on my spine” from the US and Russian rhetoric from the other panelists. Karaganov: “The problem is two-pronged. One is to win the victory in Ukraine over the West, not over Ukraine. [The] West has to be defeated. Second, the third world war could be avoided.” He accidentally called Putin “president Yeltsin” at one point. #video #politics
on 02024-11-22#Deutsche-Welle says the #Oreshnik is both 2.5–3 kilometers per second and ten times the speed of sound, quoting Vladimir Putin! Apparently he isn’t really up on modern science. #Ukraine #news #video
on 02024-11-22#MSNBC #news #video on #Oreshnik developments with Michael Froman, the chairman of the Council for Foreign Relations and former USTR, who says #Ukraine will demand NATO membership as a condition of surrender, which seems like it would be unaccetpable to Russia. #USA #politics
on 02024-11-22Russian propaganda channel WION clarifies that the #Oreshnik was “2.5-3 kilometers per second” which would be mach 7.5-9 at sea level. Dmitry Babich (foreign editor, kp.ru news) blames the war on the West’s “gender ideology, woke ideology” #Ukraine #news #video
on 02024-11-22Gus poisons the entire cartel #video #fiction
on 02024-11-22Breaking Bad Evidence Room #video #fiction
on 02024-11-22Story of Ricin Breaking Bad half-hour #video
on 02024-11-22Spinogy X30 5kW CNC Spindle + LinuxCNC EtherCAT Rigid Tapping! #Marco-Reps #video #toread
on 02024-11-22Gus Fring’s 14 most badass moves from Breaking Bad #video #fiction
on 02024-11-22“NATO to meet [Tuesday] after new Russian missile strike” (#news today, but about the Dnipro #Oreshnik missile strike yesterday) #Ukraine #politics #video
on 02024-11-22“Ucrania pide a EEUU misiles Tomahawk que puedan alcanzar a Moscú” #Ukraine #politics #news #video 2500km range, #nuclear capable
on 02024-11-22“ATTACK ON THE US: Russia reportedly threatens US defense base in Poland” #Ukraine #politics #news #video #Oreshnik
on 02024-11-22“Hank And Walt Jr. Visit Los Pollos Hermanos” #video from Breaking Bad #fiction
on 02024-11-22“Vladimir Putin warns West as Russia hits #Ukraine with new missile” #news #politics #video of almost purely talking-head filler #Oreshnik
on 02024-11-22#news #video about #Putin saying the ballistic missile that hit #Ukraine wasn’t an #ICBM but a medium-range missile. #politics #history #Oreshnik
on 02024-11-21#news #video about #Ukraine getting hit by an #ICBM #politics #history #Oreshnik
on 02024-11-21#video showing Roman pilum effectiveness against a shield. #weaponry #history
on 02024-11-19#video of Dexter Taylor, sentenced to ten years in prison for making his own guns. #weaponry
on 02024-11-19#video of reinvented ancient plumbata (lawn dart) #weaponry using a loop of cord at the back end of an arrow to keep the shaft in pure tension during the throw, allowing the lead weight to be 30 “inches” from his hand. The long, thin barbed point in front of the lead weight gives potentially very large penetration depth. He throws his 130g prototype plumbatae at 47 meters per second (140J) with a maximum range of some 180 meters.
on 02024-11-19#video #toread of printing a printed circuit board by melting solder onto it with a CNC mill driven by Mach3 G-code (generated by a 3-D printing slicer) with a fourth axis added for the extruder. The purported advantage is that it’s very easy to rework; you can lift a trace with an X-Acto knife and install new traces with tweezers.
on 02024-11-19#Argentina #politics #news #video: #Milei is like a child, according to the head of Rapa Nui, Diego Fenoglio. Only Brazil, South Africa, Colombia, and Mexico have worse income inequality. Deutsche Welle reporting.
on 02024-11-19two-hour #news #video of the House Transportation & Infrastructure Committee interrogating #FEMA administrator Deanne Criswell. #USA #politics
on 02024-11-19#news #video excerpted from a House Oversight Committee Congressional hearing about how #FEMA workers doing hurricane relief were advised to “avoid homes advertising Trump” in a list of safety measures, along with “not one goes anywhere alone”, “practice de-escalation and preventative measures”, and “communicate and follow the rules”. #USA #politics
on 02024-11-19#news #video State Department spokesperson Matthew Miller tonight about #ATACMS missile strikes on Russia: “No, I’m not gonna confirm it. I am not gonna confirm that report. #Ukraine, of course, is free to speak to what they have or have not done, but I’m not gonna confirm at this point any US policy change.” #USA #politics
on 02024-11-19#news #video about #UFOs (euphemized as "UAPs", unidentified anomalous phenomena) interfering with air safety. “The question that we really have to figure out is, is it China or is it not human? (...) Would you say that’s fair? / Dr. Gallaudet: Uh, yes, Congressman, (...)” #USA #politics
on 02024-11-19#video of some kind of right-wing propaganda featuring Rowan Atkinson #toread
on 02024-11-16#video of super calm handpan music #formina
on 02024-11-16#video of 80 minutes of #Burning-Man 02024 #toread
on 02024-11-16#video #toread by #TomLamb about digging #ColinFurze’s underground garage
on 02024-11-16#video #toread by #WildBeare about rainy #stealth-camping
on 02024-11-16#video #tutorial on Mandarin #Chinese #pronunciation in Spanish
on 02024-11-15#video #tutorial on Mandarin #Chinese #pronunciation
on 02024-11-15#video by #Ziroth on Helix Earth Technologies’s #air-conditioning with undisclosed liquid #desiccants to reduce #energy demand
on 02024-11-14#video #toread by #StuffMadeHere on new FormLabs SLA #3D-printing machine
on 02024-11-14#video #toread by #Hacksmith on real-life power armor
on 02024-11-14#video by #Ivan-Miranda on his #mechanical marble clock, this time adding a 20-stop geneva wheel
on 02024-11-14#video #toread on #manufacturing a kilogram of potassium #materials
on 02024-11-14#video on #bootstrapping acetylene #materials via calcium carbide from seashells and driftwood in an arc furnace made by winding 50 turns of 8-gauge wire through the hole of a large toroidal transformer from a 110VAC→240VAC converter. The wire turned out to be too thin, so he rewound it with 25 turns of 6-gauge. He kept melting his improvised furnace made from firebrick, so he switched to using a stainless-steel cup and a “skull crucible”. #scouting
on 02024-11-14#video #tutorial on preparing yerba mate
on 02024-11-14#Tech-Ingredients #video #toread about pulsed detonation #rockets
on 02024-11-13#video on #Erik-Grankvist turning trees into a log cabin with hand tools in winter, beginning with sawing on a pine near the base (with a push saw), then chopping partway through it with an axe, then sawing on the other side until the tree is almost cut through, switching to a bow saw near the end. He’s doing a lot of work stooped over; once the tree starts to fall, he takes the saw and gets out of the way. Then it’s on to removing branches with the axe. He measures the log with a tape measure and cuts it to length, using a jackknife to mark the cut point on the log. Then he proceeds to do the same with a second tree. Both trees have been blazed; perhaps he chose them previously, or perhaps someone else did. Then a third. A lot of shitty background elevator music. His axe aim is not very good. There are what looks like tufts of wool caught on the third tree bark; after it’s down we see it has also been blazed. At the end of the video he shows what seem to be a dozen logs as “one week of logging using only hand tools”. #scouting
on 02024-11-13#video saying in January #Argentina eliminates a 7.5% import tariff (on I guess everything). #Milei #politics
on 02024-11-12#video #toread on many different #electronics #hardware #manufacturing prototyping techniques
on 02024-11-12#video on scratching off the surface of copper-clad FR4 PCB with a scriber in order to make a quick prototype board for surface-mount #electronics #hardware #manufacturing
on 02024-11-12#Marco-Reps #video #toread on #precision #metrology power supplies #electronics #hardware
on 02024-11-12#Marco-Reps #video on #precision #metrology for evaluating his open-source ADR1000 voltage standards. He ends up #3D-printing #flexures out of ASA for its low creep to preload copper-on-copper rotary-switch contacts to try to keep oxidation down. His stator contacts are bare copper on an aluminum PCB. #electronics #hardware
on 02024-11-12#Marco-Reps #video of laser engraving with a 60-watt Q-switched ComMarker B4 fiber laser, with working settings for different materials, including color on stainless and titanium. Lots of iridescent colors. He also uses it to remove rust from a steel piston, to cut a stainless WLCSP-16 solder-paste stencil for reballing an ICE40, to weld plastic, to spot-weld stainless sheet, to weld nickel strip onto a lithium-ion battery, to weld a copper ring onto a low-carbon steel hermetic feedthrough (intermetallic laser welding), and most astonishingly, cutting 2mm steel sheet.
on 02024-11-12building a “mobile homelab” consisting of a US$280 10-watt 6-core Ryzen 5 Beelink SER5 handheld “mini desktop computer” with 16GiB of RAM running Proxmox (seems to have HDMI out), a GL-Inet AP running OpenWRT USB-tethered to his 100-megabit-per-second 5G cellphone with Tailscale, a 5-port gigabit Ethernet switch, and a US$500 Anker 533 512-watt-hour (?) (1.8MJ) portable power station, all mounted on a 750-watt e-bike with a 48V 14Ah battery (2.4MJ), which is what this #video is shilling for. He’s reverse-proxying stuff on the homelab subnet with nginx over Tailscale. Total cost US$900, not counting the e-bike, which they donated to him for shilling it.
on 02024-11-12#video of #fraud in alligator-clip lead wires: made of copper-plated iron instead of actual copper! Virtually everything he bought in the last 5–10 years with clips on the ends of it from China. That’s gonna fuck up your RF in a hurry.
on 02024-11-11#video demo of picoamp #metrology: at 10V they measured 98.8GΩ on their nominally 100GΩ resistor, but 99.1GΩ with a guard plane turned on. This suggests 300pA leakage through the Teflon standoffs, representing a 33TΩ resistance.
on 02024-11-11#video of brick-like layers for #3D-printing stronger parts with FDM, as later popularized by others
on 02024-11-11#video of "Repetition" by Max Cooper and Kevin McGloughlin, showing repeated freeways, buildings, etc., to repetitive #music
on 02024-11-11#Posy #video on household objects under high magnification
on 02024-11-11#Posy #video on iridescent colors from hot water and steam
on 02024-11-11#video on #Godot forking to "Redot" due to divisive culture-war #politics
on 02024-11-05#video on #Godot #politics, apparently there was some kind of mass banning of people who criticized their “Wokot” initiative. Juan Linietsky took his Twitter account private after saying “There are lots of people with very different views working together happily, the way it should normally be.” The Godot Foundation Board got involved and condemned the moderator (of an unofficial Godot-related Discord server) “xananax” who was calling their political opponents “cockroaches”.
on 02024-11-05#video on #bootstrapping silicon materials from waterglass and ethanol, says acetic acid works too, though 1M acetic acid in a ziploc bag didn’t work very well. However, his silicone rubber kept creeping and exuding waterglass. A commenter claims that polyvinyl alcohol or acetate also works great and is super bouncy.
on 02024-11-05#video by #survivalists on the #USA election #politics just a talking head, nothing of interest
on 02024-11-05#video by #survivalists on the #USA election #politics Just some dumbfuck talking to a camera; didn’t watch.
on 02024-11-05#video by #survivalists on the #USA election #politics. Just talking heads. Recommending stocking up on water, getting a generator, stocking up on propane, stocking up on groceries, etc. Seems like mostly generic prepping advice.
on 02024-11-05#video by #survivalists on the #USA election #politics and potential civil unrest if there is debate over who really won the election. Just talking-head filler of some dumbfuck talking to a camera.
on 02024-11-05#video #toread by #survivalists on preventing modern gear from ratting you out
on 02024-11-05#video #toread by #Practical-Engineering predicting electric grid collapse aftermath
on 02024-11-05#video by #survivalists on #USA FEMA recommendations for items to keep on hand: drinking water (4ℓ/person/day), food, emergency radio (and batteries), first aid kit, dust mask (!), flashlight (and batteries), a whistle, plastic sheeting and duct tape, moist towelettes, garbage bags for pooping, and plastic ties, wrench and pliers to turn off utilities, a can opener, a local map (on paper). This is from March 02020, so it represents a pre-COVID or early-COVID perspective. The talking head filler dude also recommends small-denomination cash (for power outages when stores are still open), a portable water filtration system, rubber gloves, and a propane camping stove.
on 02024-11-05#video #toread by #survivalists on the #USA election #politics
on 02024-11-05#video #toread by #survivalists on soldier #scouting
on 02024-11-05#video by #survivalists on the #USA election #politics. Recommending, before the election: get cash out of the bank, make sure your gas tanks are full, develop a family communications plan, stock up on groceries, do urban errands early, stock up on ammunition, try shutting off your main breaker for a few days to test how you’d handle a power outage, get to know your neighbors, charge up all your devices. Just video of some jackass named #MagicPrepper talking to a camera on a shooting range.
on 02024-11-05#video #toread by #survivalists on illegal prepping items to get now
on 02024-11-05#video #toread by Christian #survivalists on Hurricane Helene
on 02024-11-05#video #toread by #survivalists on Hurricane Helene #todelete
on 02024-11-05#video by #survivalists on portable solar power stations, mostly talking-head filler, although he does show some of them. Says many are fraudulently sold as “solar generators” and also use shitty lead-acid batteries, but that in “the last couple of years” (02023–4) they’ve “really taken off”. There’s a nice data table at 12'34" of cost per watt hour, ranging from 49–51¢ (Eco Play, SolarPlay) to US$1.21–1.22 (Anker, Bluetti). I don’t think he’s tested all the units in the table, though; he’s just using their advertised capacity.
on 02024-11-05#video #toread by #survivalists on Hurricane Helene #todelete
on 02024-11-05#video #toread by #survivalists on Hurricane Helene
on 02024-11-05#video #toread on a pulse-tube cryocooler. #cooling
on 02024-11-05#video #toread by #survivalists on Hurricane Helene #todelete
on 02024-11-05#video promising a revolution in #air-conditioning. A lot of talking-head filler and scientific errors. The purported revolution is Magtor’s linear motor to drive a piston-pump compressor at 60Hz, purportedly 33% more efficient. #cooling #HVAC
on 02024-11-05#video #toread by #survivalists on Hurricane Helene
on 02024-11-05#video #toread by #survivalists on Hurricane Helene
on 02024-11-05#video by #survivalists reflecting on Hurricane Helene: what was valuable was having a small 2kW gasoline generator, having chainsaws for the fallen trees, having oil and spare chains for the chainsaws, having a lot of gasoline stored up for the generator and chainsaws, having cash on hand (especially small-denomination bills like US$5–20), having a small propane cookstove (with propane, ideally in 20-“pound” canisters, from which you can refill your small one), have a water reserve and a way to filter it (like a LifeStraw), have lots of lighting (flashlights, lanterns, enough to give to neighbors), keep a Crockpot full of hot water next to your sink to provide you with hot water for washing dishes (which also can reheat food in mason jars), watch BBC farm series like Victorian Farm and Tudor Monastery Farm to get ideas, have a way to do laundry (he had his kids stabbing a tub of laundry with a wooden stick, and wringing it with a mangle), have fast-charging portable power stations or battery packs, which they used to keep their neighbors’ freezers going, and have compassion. In his area SMS would go through from time to time.
on 02024-11-04#video of color amplification and #motion-amplification with “Eulerian magnification” by filtering a Laplacian pyramid (?) by Miki Rubinstein
on 02024-11-03#video by #Posy on his “lazy” channel.
on 02024-11-03#video by #NileRed on making pop-rocks candy by bubbling CO₂ under pressure into candy as it cools
on 02024-11-03#video #toread about differential pair routing by Rick Hartley
on 02024-11-02#video about #bootstrapping salt #materials by oxidizing urea (from #CodysLab urine) with bacteria on a charcoal packed bed supported on hardware cloth with a process tower made of a Rubbermaid trashcan and a 200ℓ drum, with water sprayed through plastic pipes connected via tee hose barbs, mounted with baling wire, using a powerline timer to run the pump a couple of hours a day. An aquarium bubbler keeps the reservoir aerated; an aluminized tarp keeps sunlight off to prevent algae. I thought this might emit a lot of ammonia, but he said, “I knew I had fed it too much when it started to smell like a truck stop bathroom,” but normally it smells like a “well-cycled fishtank”. Calcium carbonate chips in the reservoir keep the pH from dropping too low for the bacteria. He thinks he would need a machine three times bigger to process all his urine.
on 02024-10-30#video about glow powder strontium aluminate #materials fired in a microwave kiln. #toread
on 02024-10-30#video about #bootstrapping pure #materials from fertilizers. Like calcium nitrate from the hydrated double salt with ammonia. (Boiling with slaked lime drives out the ammonia as gas.) Urea he simply recrystallizes with water. Ammonium sulfate he recrystallizes with water by evaporation, which is tedious because you can’t crystallize it by cooling. By #Apoptosis. #scouting
on 02024-10-30#video about #China crossbow #weaponry, funded by crossbow manufacturer (!!) Tenpoint, who is giving away a Siege 425 crossbow, which shoots 16-“inch” carbon-fiber composite arrows, mass not disclosed, at 425 “feet” per second (thus the name). One reason for China sending soldiers through two years of crossbow training might be the #India border dispute, though the armament limitations don’t seem to cover ordinary automatic rifles and no #crossbows have been observed in use in the border dispute area. Pretty worthless damn video by #TaskAndPurpose. Plonk.
on 02024-10-30#video #toread about #Ukraine #drones #weaponry from last week
on 02024-10-30#video about LED #lighting lightbulb #electronics failure modes. A resistor came desoldered from the aluminum PCB on the first one. (I didn’t realize that some of them have current-limiting resistors shrinkwrapped into the leads from the E35 lamp base to the board, 10Ω in the case he shows.) In another case, a 200Ω surface-mount resistor had failed short. Interestingly he disassembles the lamp bases by running a boxcutter around under the metal base, breaking the bond to the insulator that separates the base electrode from the thread electrode. An older bulb with a cast-aluminum heatsink has a switchmode power supply in the base. Its power transistor and other major components were good, so he doesn’t find out what the problem was. #hardware
on 02024-10-30#robotics biped by Qihao Guo. #video
on 02024-10-26#robotics #video by researcher peng-zhihui in China who built a robot arm with various different user interaction modes, running on LiteOS #HarmonyOS.
on 02024-10-26#video of a fire extinguisher filled with gasoline pressurized with butane to put out burning magnesium, which doesn’t work as well as salt
on 02024-10-23#video playlist in #Chinese by Grace Guo. Parallel pinyin, traditional, and simplified examples with human pronunciation, word-by-word explanation, and overall explanation.
on 02024-10-23#video on #bootstrapping H₂SO₄ from epsom salt with a PbO₂ electrode and a clay pot #materials #scouting
on 02024-10-23#video on psychology of children of narcissistic parents
on 02024-10-23#video on #3D-printing forms you fill with concrete for #bootstrapping #machining tools like a lathe
on 02024-10-22#video reviewing YouTubers speaking #Chinese; Xiaoma and Oriental Pearl both end up in tier 2, “Accomplished,” along with June Yu. LeLe Farley, Laoma Chris, and Julian eu8hz got awarded “God” tier.
on 02024-10-20#News #video from #Al-Jazeera about #Facebook #censorship on #Israel, quoting Human Rights Watch, and also interviewing two ex-Facebook workers fired for their Palestinian advocacy (Saima Akhter and one other), as well as Palestinian photojournalist Motaz Azaiza, who says 40% of his #Instagram posts since October 02023 had been censored. Mostly #interview and stock footage. #human-rights
on 02024-10-20#video #formina for intermediate #English listening practice, discussing American culture
on 02024-10-20#video on #Chinese roadmap, emphasizing #pronunciation first. He recommends, in addition to his own #MandarinBlueprint materials, ChinesePod (“thousands and thousands of really well-done dialogues”), Du Chinese, Anki (or Traverse, Mochi, or Quizlet), YouTube/Netflix, mànhuà applications for Chinese comics, Pleco as a dictionary, etc. Basically entirely talking-head filler with stock-footage crap.
on 02024-10-18#video with too much talking head about polar #3D-printing
on 02024-10-18#video on #Chinese Mandarin #pronunciation with #IPA. Worth rewatching!
on 02024-10-18absolutely fantastic #video #toread on #Chinese Mandarin #pronunciation with 25 listening practice problems for the difficult initials (c/z/ch/zh/j, x/sh, etc.)
on 02024-10-18#video #toread on #Chinese Mandarin #pronunciation, really excellent, by "Rita Mandarin Chinese"
on 02024-10-18#video #toread on #Chinese Mandarin #pronunciation
on 02024-10-18#video #toread on #Chinese Mandarin #pronunciation
on 02024-10-18#video on #Chinese Mandarin #pronunciation #es. Not that great, but it’s in Argentine Spanish.
on 02024-10-18#video on #Chinese Mandarin #pronunciation #introduction
on 02024-10-18#USA #humor #video about accent diversity
on 02024-10-18#Argentina #humor #video about insults
on 02024-10-18#Argentina #humor #video of what Argentines know about the US #formina
on 02024-10-18#Milei endorses blockchains and cryptocurrencies. #Argentina #politics #video
on 02024-10-18#video on nickel #plating at home in a glass jar #electroplating #toread
on 02024-10-18#Video #interview with #Tori-Amos, an hour and a half about her creative process, but also about what music she likes, about #menopause, etc. At 17'22" there’s a bit about musical novelty
on 02024-10-18#Argentina #video on #racism #forMina. “Keenan” is mostly just talking to a camera and discussing #dating in nightclubs and whatnot, saying he doesn’t know much about prostitution. He also doesn’t know what a bidet is. Basically his conclusion on racism in Argentina is that it doesn’t exist.
on 02024-10-18#video about #Mr-Electron #manufacturing #aluminum-air #batteries with a carbon brush from a motor as the cathode in a potassium hydroxide electrolyte, or some bent-up baling wire. He’s hacksawing the top off a lead-acid battery case from an old motorbike and gets an open-circuit voltage of about 1.6 volts and a short-circuit current that’s initially 20mA with an aluminum-foil anode; when he replaces the carbon-brush cathode with the bent-up baling wire this jumps to 40–80mA. #hoarding #electronics #energy #toread
on 02024-10-18#video about #manufacturing #aluminum-air #batteries with #3D-printing ABS. He says potassium hydroxide will eat PLA, which makes sense but which I hadn’t realized. #Mr-Electron here is using steel baling wire for his cathodes. For his anode he cuts up thick aluminum sheet metal with shears and then presses it flat in a vise. Each aluminum anode plate is crimped onto baling wire from the following cell in the battery using a hammer and anvil. He gets 10.2V open-circuit voltage from 8 series cells. I’m unclear how air is supposed to get to his cathodes. He does some load testing with small electric motors but doesn’t actually measure the current. The short-circuit current he measures is 160mA and rapidly dropping. After testing with LEDs for a while the open-circuit voltage has dropped to 3.8 volts. Later he cuts cathode forms out of CDs with an angle grinder and cutoff disc, wrapping them tightly with baling wire to maximize area. His higher-current anodes are aluminum-foil-wrapped popsicle sticks, dimensioned to fit inside the battery compartments, but for whatever reason he didn’t install the plates parallel, resulting in a dramatically unnecessarily high internal battery resistance, which he doesn’t bother to measure, but he gets 240mA out of it. His connections to the aluminum plates are made by torquing a pringled steel washer down onto their non-submerged ends with a bolt. The 6 cells in series ought to give about 9.6 volts open-circuit, but instead he gets only 4.8V (0.8V per cell), which he blames on residual sulfuric acid contamination, but commenter “gsestream” suggests might be due to a lack of oxygen. He uses a DFRobot USB boost converter to charge his cellphone. #bootstrapping #scouting #jugaad
on 02024-10-18#video called "The Incredible Machine" from 01968, uploaded to YouTube 11 years ago, about GUIs on the “Graphic One” computer with a light pen. Analog circuit simulation is the first task shown, followed by animation recorded onto film (generated by punched cards). Then visual perception experiments, photomosaics made out of icons, a synthesizer singing “A Bicycle Built for Two”. With a cameo from the RAND Tablet. #history
on 02024-10-17#video by #CodysLab about why humans shouldn’t be going to #Mars yet, because humans will contaminate Mars with their bacteria, which would make it impossible to tell if there was indigenous Mars life, while AI could explore Mars. He proposes maintaining Mars as a nature reserve for a century.
on 02024-10-17#video #toread about a concrete keyboard by #EvanAndKatelyn
on 02024-10-17#video #toread about nuclear #rockets #flying to #space (44-minute lecture with FEM output)
on 02024-10-17#video #toread of a camera built into a Kwikset key to see inside the lock
on 02024-10-16#video #toread on "Locust" laser #weaponry against #drones
on 02024-10-16#video #news on a #Hizbullah attack on #Israel today: 50 rockets. Note that this was a month after Israel’s pager attack on Hizbullah.
on 02024-10-16#video on an Irish guy in #China married to this Chinese comedian Dawn Wong
on 02024-10-16#Forbes #news #politics #video #toread about fears about #USA inflation? “Trump Pressed on Fears about U.S. Currency”!?
on 02024-10-16#Argentina #video #toread about apparently #capybaras in a Buenos Aires park?!
on 02024-10-16#bigclive #video #toread on overcomplicated air freshener #electronics #hardware
on 02024-10-16hagiographic #Elmu #video #toread from 11 years ago
on 02024-10-15#video on #Chinese pronunciation and especially tone pairs
on 02024-10-15talking-head #video of a gorgeous woman explaining the quantum-mechanical usefulness of rubidium
on 02024-10-10#video #toread on #3Blue1Brown’s #Manim library, walking you through some of the first steps
on 02024-10-10#video on an overview of a 4-year electrical engineering curriculum in 26 minutes. But basically it’s some guy talking to a camera while we watch him look up images on Google Image Search. #Plonk to “Ali the Dazzling”. I am not dazzled.
on 02024-10-09#video #toread on doing the double-slit experiment at home with your hair. Author’s Ph.D. in quantum physics didn’t prepare her for what she found.
on 02024-10-09#video by #Akio (the switched reluctance motor guy) about #TCES #energy storage. Dramatically impractical setup trying to use 45 grams of granular CaCl₂ in contact with aluminum (!!), which heats up the 2.5ℓ/s of air from his computer fan from 15.5° to 23°, which by my calculations works out to about 20 watts of heating, 13 watts by his incorrect calculations (6 Wh over 28'). Then he regenerates it (from 55g back down towards 45g) in a steel can (!!!). 6 Wh in 45g is 0.48MJ/kg. He devotes a lot of talking head footage to explaining that he doesn’t know how to use his measuring instruments.
on 02024-10-02Reinier Kuppens’s #video about 50 randomly generated 2-D dynamical #mechanisms, simulated with the Newton–Euler dynamical equations using mass but without friction. Mostly interesting as a demonstration of kinematic diagrams using links, springs, and kinematic couples of type hinge and slider. Up to eleven links if you count ground, except for the last mechanism, which has 17 and falls apart. The links are displayed as rounded polygons in pastel colors with alpha, with a Secchi disk fiducial in the middle. Some of the mechanisms have only one degree of freedom and nevertheless have very complicated movement paths. “Each mechanism is generated by randomly creating a labeled graph from which overconstraints are removed. Then, for all components, parameters are randomly chosen, such as hinge locations and spring constants. The equations of motion are then solved and an animation is created from the resulting timeseries. Everything programmed in MATLAB. More information can be found in this paper: (#stringbased) ... Various numeric integration schemes can be used, but I used the Runge-Kutta 4 method in combination with a [Newton-Raphson] algorithm to fix the constraints after each time step.” #mecheng
on 02024-10-02#video about #3D-printing #flexures #mechanisms with mostly the same standard flexures popularized by BYU that everyone shows.
on 02024-10-02#video about spherical #flexures #mechanisms by Jelle Rommers
on 02024-10-02#video #toread about designing #flexures (37') #mechanisms
on 02024-10-02#video #toread on bending #wire for retainers #mechanisms
on 02024-10-02#video #toread on #wire #flexures about an airpot #mechanisms
on 02024-10-02#video #toread #Disney-Research on kinetic #wire character design #flexures #mechanisms
on 02024-10-02#video #lecture 9 part 1 on #mechanisms of #flexures. Hopkins demonstrates how to analyze serial flexures as combinations of parallel flexures, showing that a bent blade flexure is kinematically equivalent to a wire flexure.
on 02024-10-02#video #toread on solving Conway’s #Game-of-Life backwards
on 02024-09-30#video #toread on state machines and #statecharts in #Godot
on 02024-09-29#video #toread on moving from Unity to #Godot
on 02024-09-29#video on #3D-printing an #STM for #microscopy. This is a unimorph disc type made from a piezo buzzer; he ruined several before switching to ultra-fine magnet wires and low-temperature solder (ChipQuik?). His kinematic mount seems to consist of three bearing balls, one in a V-groove, one on a flat glass surface, and one in some kind of a pit, each adjustable with a knurled screw. He seems to have used heat-set inserts to build his frame out of 3-D printed plastic — although PLA has the best TCE of common plastics, he’s using PA-CF, carbon fiber reinforced nylon, which ought to be pretty stable in the X and Y dimensions, like wood. (He mentions that many STMs are made out of Zerodur or similar glass-ceramic #materials.) Printed on a Bambu Lab X1 Carbon. The voiceover might be an AI reading a script because it mispronounces a lot of words and sometimes gets the prosody of sentences wrong, despite having a bog-standard GA accent. He put metal tape on the parts for EMI shielding; looks like aluminum flashing. To pre-amplify the nanoamps or picoamps signal from the tunneling current, he copied Dan Berard’s open-source STM preamp circuit, naturally using a current-to-voltage converter built around an op-amp, but I can’t tell which one. He shielded his cable to the probe and put the analog electronics in a Faraday cage to reduce EMI further, getting only about 10pA of noise. Berard’s #electronics design used an OPA124, but he says “The chips used in Dan’s design are hard to find these days.” When it comes to #microcontrollers #hardware, he’s using a Teensy 4.1. He’s using an aluminum plate and some rare-earth magnets to damp the oscillations of his stable platform. “This is the first atomic image captured by a 3-D printed scanning tunneling microscope.”
on 02024-09-28#video #toread on “digital glasses” (apparently a head-mounted display called Even Realities G1)
on 02024-09-24#video #toread on galvano-gimbaled mirror #optics
on 02024-09-24#video on #bootstrapping a DIY #CNC #machining mill under US$100 by #Hyperspace-Pirate, somehow including multiple-start leadscrews, brass nuts for them, etc. He’s #3D-printing the brackets to hold the aluminum together. Basically a bunch of aluminum extrusions (largely 8020 style held onto the brackets with T-nuts) to make a bedslinger gantry, which he can now mill aluminum on. The slinging is all happening with leadscrews instead of timing belts. He’s using NEMA steppers with shaft couplers, lots of Allen screws, precision-ground rods with linear ball bearings running on them, etc. Not super practical for poor people! The simple rectangular design maximizes compliance, which is counterproductive. And it’s going to lose steps and ruin parts from the end effector side loading. “I’m using a 24V 20A power supply which is way beyond what the machine needs but it’s what I had sitting around.” He’s running GRBL on an Arduino Uno, with A4988 breakout boards on an Arduino shield on top of it to drive the steppers. For whatever reason he decided to run the spindle off a 555 PWM driving an IRLZ34N MOSFET. He’s using UGS (Universal Gcode Platform) on his laptop to send the G-code to GRBL. He engraves and routes some wood with a ⅛” endmill. Rigidity problems initially prevent cutting aluminum. Budget: US$30 for spindle motor and collet (1.5A), US$24 for the build plate (¼” aluminum), US$11 linear bearings, US$10 extra endmills, total US$75.
on 02024-09-24#video #toread on DIY (?) metal #3D-printing
on 02024-09-24#video purportedly on #flying microscopic robots with invisible batteries (MIT Micro Bots). Video, from "AI Uncovered", is just a compendium of worthless irrelevant stock footage. Plonk.
on 02024-09-24#video #toread on DIY metal #3D-printing
on 02024-09-24#video #toread on DIY metal #3D-printing with “DED”
on 02024-09-24#video #toread on alternatives to “fuzzy skin” for #3D-printing
on 02024-09-24#video #toread by #Makers-Muse on #3D-printing without looking 3-D printed
on 02024-09-24#video of reusing #hoarding old earphones for #electronics #hardware. There’s a continuity-tester Android app, haha! Nice #jugaad with a 2.2kΩ resistor desoldered from a power-supply board, hot glue, and heat-shrink tape. And apparently there’s also a TV remote control Android app called ZaZaRemote by Tiqiaa if you plug infrared LEDs into your microphone port, which the app knows under the name “Smart-ZaZa” or “Audio-IR device”. #bootstrapping
on 02024-09-24#video of a spot welder made with a carbon rod from #hoarding used AA batteries and an 800mA laptop power supply
on 02024-09-23#DIYPerks #video about things you can make from old laptops. Speakers (especially for laptops made around 02008). Heatpipes and cooling fan for cooling high-power LEDs. Diffusion sheets (for lampshades), fresnel lenses, and acrylic back panels (edge-lightable with LED filaments) from the screen. Or use them all together together with the existing backlight to get a lightbox or fake window. Non-smashed screens can be connected to an external driver board to make a monitor (they sell these?). Microphone (he recommends some prefab preamp board with AGC). Hard drive: disc sander for pencil sharpening (just by popping the cover off and gluing on sandpaper), wind chimes from platters, round mirror for analog clock face, laser galvo from the heads’ voice coil actuator (with a laser-pointer diode glued to it instead of using a mirror, you get an “analog VU meter” even with just one axis). 18650s from “older” battery packs (this video is from 02020, so maybe he means before 02010); he suggests sort of manually shapering your way through the plastic case, and using 2.8V as the lower limit for usable batteries, and apparently “single-cell battery-bank cases” are also a thing you can buy. Laptop webcams are usually USB! (Certainly true of this laptop here.) #hoarding #electronics #hardware
on 02024-09-23#Dr-Volt #video about converting an old Logitech mouse into a camera. It had a custom Logitech DIP on a single-sided PCB, separate from the ADNS 2610 camera sensor DIP, which has an 18×18 array of photodiodes visible under a microscope, with an “AGILENT 28D3D” label on the exposed die and a date of “2004”. Since he didn’t have a datasheet for the Logitech microcontroller, he hooked up the sensor chip to an #ESP32 S3 (programmed with #PlatformIO and VSCode) from his collection of #microcontrollers, like the one he’d built a laser scanning microscope from before. The chip uses an SPI-like protocol, but using a bidirectional data pin, and it exposes registers for not just Delta_X and Delta_Y but also some others including Pixel_Data, reads from which provide one pixel after another (so there’s no way to request a particular pixel). The mouse’s native resolution seems like a decent monochrome microscope, but with a very small field of view. He was able to get about a 3fps frame, unsurprising for what’s basically a debugging feature. He grafted the ESP32 into the mouse. #hoarding #electronics #hardware
#video about using an FT232R UART/USB converter chip with USB OTG to get some GPIOs out of an #cellphones. #hoarding #electronics #toread
on 02024-09-23#skibidi-toilet 77 part 3 #video
on 02024-09-23another #ngscopeclient #video #toread showing the filter graph editor, but mostly focusing on how to get it to compile
on 02024-09-23#video #toread about #precision time #metrology with TCXOs, OCXOs, GPSDOs, and a rubidium atomic clock, using #ngscopeclient to visualize the phase shifts, by #azonenberg
on 02024-09-23#video taking apart some #Tesla motors and discussing how their #manufacturing is done. The motors have a lot of electromagnetic poles, like hundreds of poles, on the three-phase stator, although they do gear the motor down to the wheel. There are cooling channels through the stator. The rotors seem to be permanent-magnet type with laminates (electrical steel?) and carbon fiber wound around them presumably to keep them from coming apart. The laminates give you almost no flux outside the rotor except at 12 spots around the circumference where there’s a gap comparable to the size of the poles on the stator. The magnets are actually quite small compared to the whole rotor.
on 02024-09-22#video about "SynRM" #switched-reluctance motors made out of sheets with slots punched out to follow field lines. Low-quality AI voiceover from #Lesics. #hardware
on 02024-09-22#video about air-core axial-flux DIY motor-generators
on 02024-09-22#video by #Murray-Smith about “game changer?” linear (or rather reciprocating) #switched-reluctance motors (or rather generators). Lots of talking-head filler, but at least a third actual information. But this isn’t actually a switched-reluctance design; it’s a permanent-magnet design! But with both the coil and the ring magnet fixed, coupled by a moving core. He said it took him two hours to make it from scratch, including the wood base I guess, which is sort of a game changer. He gets 600mV open-circuit voltage spinning it by hand and 40mA short-circuit current, so ≤24mW, which makes it less of a game changer since he’s exerting several watts of power to spin the crank. (He claims “It’s generating quite a lot of energy from something so trivial!” but according to his measurements it isn’t.)
on 02024-09-22lecture #video from 02012 (? or 02019?) by JR Hendershot about #switched-reluctance motors (“reluctance synchronous motors”) mentioning ABB’s new #SynRM product line (17–350kW), mentioning higher torque density than induction motors (which use the exact same stator design) and lower cost than permanent-magnet electrical machines as key advantages. Cites a price spike in neodymium as a key reason for interest in the area, which makes me think it’s from 02012 rather than 02019, when it was uploaded to YouTube. It actually says that “reluctance synchronous” motors are different from “switched reluctance” motors. Shows little webs in the stamping to hold the flux carriers together in the transversely laminated anisotropy rotor. Shows ABB’s plot of efficiency over its product line, ranging from 88% at 1kW rated power up to 97.5% at 700kW, because of the missing ohmic losses in the rotor relative to an induction motor. Boglietti and Pastorelli’s paper from 02008 reports 17% higher torque for an SRM (RSM) version of an existing induction motor. Shows some asterisk-shaped switched-reluctance rotors (using higher frequencies) and contrasts with RSMs’ trippy rotor design (using the same inverters as for an induction motor). Also has some nice electronics schematics. “The key to the improvements in efficiency and power factor lies in the inductance ratio or the saliency ratio in the d [direct] & q [quadrature] axes.”
on 02024-09-22#video on very simple single-coil #switched-reluctance motor #hardware. Not optimized; a low efficiency mild steel design, science-fair style. Requires manual start!
on 02024-09-22#video by #Akio showing his Arduino-driven #switched-reluctance motor #electronics control board and working motor #hardware
on 02024-09-22#video on recreating #Gelbart’s bending brake #manufacturing
on 02024-09-21#video of #Gelbart mostly about spot welding. He recommends 15–25 kVA spot welders at 2½ volts with 5000 amps, for 1–4 cycles for thin ferrous sheet metal, up to 10 gauge, and up to 12 cycles for mounting hardware like screws or, with a conical-hole electrode, balls for kinematic mounts. I’m guessing a “cycle” is 16⅔ms. Talks about how to spot-weld #nitinol into #flexures. Recommends tungsten/copper or chrome/copper alloy tips for your electrodes. #manufacturing #precision
on 02024-09-21#video of #Gelbart mostly about how to use adhesives, especially silicone, epoxy, polyurethane (e.g., Gorilla Glue), and spray contact cement. Also talks about #flexures for clamping things. And how peeling-mode failure kills adhesive joints, though less so if you use flexible adhesives. #manufacturing
on 02024-09-21#video of Romanian flute #beatboxing #music
on 02024-09-21#EEVBlog mailbag #video about Forrest Mims, piezoelectric transducers, Simpson panel voltmeters from 01976 with Panaplex 7-segment neon displays, an RF tank level sensor teardown (it sweeps a VCO to find nulls, comparing the tank reflection to a reflection from a known length of coax to avoid having to calibrate the VCO), and mostly a Tomlov “4K AF Max” microscope
on 02024-09-18#video by economist Yi Wen at the Shanghai Jiao Tong University on how #China needed the #USA export control trade war to develop its domestic chip industry, because the alternative would have been to erect trade barriers in blatant violation of #WTO policies and get kicked out of the WTO. Mostly talking head footage with stock footage. #history #politics
on 02024-09-18#ElectroBOOM #video about the Veritasium long-parallel-wires experiment, showing the nicest demonstration so far of the time lag in connecting and disconnecting the far end at 11'55" #electronics
on 02024-09-18#video from today about the #Ukraine loss of Ukrainsk near the Donetsk capital #toread
on 02024-09-18#video #toread about #hoarding windshield wiper motors for #mechanisms
on 02024-09-18#video from #AvE of a botfly larva eating a mouse he caught in his trap. Possibly the worst thing I’ve ever seen.
on 02024-09-18#video #toread on #vanlife by #Al-Mundo-con-el-Mate doing #tourism in #Bolivia
on 02024-09-18#video #toread on the #Hacksmith studio, which has a quarter million dollars a month in overhead. 10% of revenue from YouTube, 40% sponsorships, 50% merch.
on 02024-09-18#video on #manufacturing a Le Corbusier style chaise longue from 19mm-thick #Portland #concrete reinforced with alkali-resistant chopped glass fibers and an alkali-resistant glass fiber scrim and an acrylic filler, laid over a #CNC routed MDF form.
on 02024-09-18#Argentina #tourism #video #toread #formina
on 02024-09-18#video on dating culture in #Finland
on 02024-09-18#video about black people dating in #Japan
on 02024-09-17flattering #video by former employees on what it's like to work for #elmu
on 02024-09-17#video #toread about #Argentina tourism at Temaikén in Russian
on 02024-09-17#video about the 20GW 283km² (or 39000km²?) #wind #energy farm in Gansu, #China, the Jiuquan Wind Power Base, with 7000 windmills, for which they’re building #HVDC transmission lines. As usual with Matt Ferrell #Undecided videos, it’s 100% talking heads and stock footage, therefore a waste of time. Although seeing the wind farm was cool.
on 02024-09-17#video about scraping the #Gingery lathe bed flat with #precision hand scraping after roughing it in with an angle grinder flap disc
on 02024-09-17#video #toread about #precision lapping three flat cast-iron discs using the Whitworth method.
on 02024-09-17#Breaking-Taps #video about looking at #precision flat surfaces with atomic force #microscopy. His new gauge block has 12 nanometer RMS surface roughness with a total range of almost ±50nm over the 10μm square field of his AFM. A first-surface mirror is 3nm RMS with 36nm range. A λ/20 fused silica mirror blank (λ = 632.8nm) is 2nm RMS, 39nm range. A cheap glass microscope slide is 1.9nm RMS, 62nm range, mostly due to a few big peaks. A silicon wafer is 1.6nm RMS, 17nm range. And a piece of mica (!!!) is 530 picometers RMS, 8nm range.
on 02024-09-17#video about #optics microlens arrays as a “key to our sci-fi future”. Nanometer-sized pillars on a silicon wafer; company is Metalenz. Video (by "Freethink") is pretty clueless and gives no real information about #metamaterials except that they can do polarization imaging. Lots of talking-head filler. #Plonk
on 02024-09-17#Breaking-Taps #video #toread about DIY laser #photolithography
on 02024-09-17#video #toread about #3D-printing #optics components (not lenses, prisms, and mirrors tho) #Breaking-Taps
on 02024-09-17#video about #energy from bifacial #solar #photovoltaic panels mounted vertically in Ohio, showing production curves throughout the day, and how some reflectors on the ground change them. He says Sirius brand bifacial panels, from a company in Texas, are 45¢ a watt, assembled; cloudy days have about a third as much energy as sunny days, but affect the vertical panels less; and overall the vertical panels only produce 79% of the conventionally mounted south-facing bifacial panels. It looks like he’s using a roll of shiny wrapping paper for his ground reflector (he says it’s a large roll of mylar) and stretched it over wooden boxes, supported on pallets 20° from horizontal. Reflector results plot at 12’01". They’re still not as good as conventional south-facing panels (8% better than vertical bifacial panels without reflectors, but only 83% as good as bifacial south-facing panels) but maybe different reflector designs could improve this. The midday dip was only down to 150 watts per panel instead of the previous 100. Lots and lots of time-wasting talking-head footage, even if he is standing in front of a solar panel.
on 02024-09-17this #video about Huawei’s triple-fold phone is pretty amusing #humor
on 02024-09-16#video #toread about #Ukraine invading Belgorod as well as Kursk, from a pro-Ukraine propaganda channel #politics
on 02024-09-16#JSK-koubou #video #toread on #manufacturing circular-saw hacks #todelete
on 02024-09-16#video on sharpening zirconia knives, which turned out to be difficult; he had to make the “increase the sharpening angle relative to the stone, making the apex angle more obtuse” to get the apex to stop chipping off on his resin-bonded diamond stones. Lots of slow-motion closeup footage. He was unable to get the zirconia knife to a hair-whittling edge. #manufacturing
on 02024-09-16#video #toread on #manufacturing a "murrine" vase at First City Art Center. I thought this was going to be about calcium fluoride #materials, but actually it’s just sections diamond-sawn from glass canes. The end result unfortunately looks kind of badly drawn. #glassblowing
on 02024-09-16#video on #DLyte brand #electrolysis #finishing with dry electropolishing
on 02024-09-16#video #news about people in Russia getting punished for criticizing the #Ukraine war
on 02024-09-16#video from three days ago about #Anduril’s Barracuda cruise missile #weaponry #drones. #Palmer-Luckey describes #China as an “expansionist dictatorship” and claims that Anduril’s autonomous drones in #Ukraine have been crucial to destroying Russian hardware. He pronounces it ['ænd ɚ ,ɪl]. “I don't think the United States needs to be the world police. We need to be the world gun store. (...) Ukraine has really exposed this weakness in the United States' foreign policy strategy, where we say we support all of these people, but they look and say, ‘They can’t even manufacture the basics, like artillery shells or, you know, small missiles.’” They just raised money on a US$14 billion valuation to build “Arsenal One, a five million square foot factory that we’re building”. Refuses to comment on possible deployments in Israel, but says, “We have a very strong relationship with #Taiwan,” and says Anduril was recently sanctioned by the CPC.
on 02024-09-16#video from yesterday #toread about #weaponry #drones on the Pokrovsk front in #Ukraine
on 02024-09-16#video #interview with Warren McCulloch, of the McCulloch–Pitts neuron, unfortunately vandalized with ignorant voiceovers. #neural-networks #history
on 02024-09-16#video from four days ago: #Ukraine #news #toread from #Azov brigade (still with the damn wolf hook) on an offensive in Luhansk
on 02024-09-16#video of a Russian POW from Kursk on #Ukraine state TV UATV
on 02024-09-16#video #news about a 17.2% fall in supermarket consumption in #Argentina in August, the 9th month of #Milei’s mandate, down 10.6% from the beginning of the year (which I guess means it was up from the beginning of the year in July?), #interview with Marco Lavagna, INDEC director #toread
on 02024-09-16#video on #Ukraine’s invasion of the Kursk Oblast of Russia; seems like they’ve lost substantial ground to the Russians in the last week.
on 02024-09-16#video #elmu complaining about government #bureaucracy. Claims most of #SpaceX’s revenue is commercial, not from the government. Likens Boeing’s former CEO to a cavalry captain who can’t ride a horse.
on 02024-09-16#video of 0de5, which I think is a hex dumper? no, it’s some kind of course in how to be a “great hacker”. Lots of talking head footage. Plonk to #Kay-Lack!
on 02024-09-16#video #toread showing scenes of daily life from Tehran, #Iran
on 02024-09-16#video #toread about flawed grounding concepts in #electronics (“bad grounding concepts many engineers believe, part 6”)
on 02024-09-16#video #politics #news from #Argentina of #Milei speaking (at Congress?) for 40 minutes last night about the budget he’s proposing and bragging about how great his presidency has been. He claims homicides in Rosario are down 75%. Halfway through his supporters in the galleries start singing football songs.
on 02024-09-16#video #toread on Mark #Zuckerberg interview about #AI
on 02024-09-16#video #toread on Carlos who got kicked out of his #underground #stealth-camping house in New York City’s Freedom Tunnel in 02012. He has a hard time recognizing people’s faces, it seems, and has some apocalyptic delusions from Family Radio, 94.7 FM.
on 02024-09-15#video #toread on #Cylo’s thrust air-bearing prototype. #precision #mechanisms
on 02024-09-15#video on #Cylo problems in #precision #optics #manufacturing #mechanisms: “Nanoscale air bearing vibrations cause surface finish issues in diamond turned surfaces.” 50 nanometers of vibration gave a “hazy” surface finish, although you’d think it wouldn’t.
on 02024-09-15#video somewhat poorly explained on #3D-printing #kinematic-coupling #mechanisms for #precision #optics. He shows his optical kinematic mount for a long time without showing what he’s going to use it for, instead trying to explain it in words. He has a green diode laser module mounted in a 3-D printed thingy which is pushed apart with screws (with ground and buffed ends rather than ball bearings as you’d expect) running through soldering-iron-staked brass inserts, pushing on flat stainless steel plates, pulled together with tension springs pulling on bits of welding rod, and pivoting on a 7mm stainless steel ball bearing; all the metal parts are inserted into the plastic framework. I think the idea is that you slide this thing around on a surface and the angle of the laser changes to show you the angle of the surface. The laser module is clamped into the thing with an M4 screw tightening a sort of plastic shaft-collar arrangement around it, and a Powell lens (?) turns the laser beam into a line, which I guess lets you determine the surface’s angle in both dimensions at once? He thanks “Zachary from Breaking Taps” for tips. He’s planning to focus the laser through a spatial filter with a microscope lens to clean up the dirty “cat’s-eye” beam. He’s going to put ball bearings in the base of the mount too, to hold it up (bizarrely, four of them instead of three!), and there’s a screw in the middle to hold it down to a screw hole on the optical breadboard. He's planning to replace the plastic with aluminum or stainless steel. In the comments, @bansci recommends using #OpenFlexure designs and captive nuts rather than heat-staked inserts.
on 02024-09-15#video on the Maxwell criterion for #precision #kinematic-coupling explaining how you want potential movement to be nearly perpendicular to the bearing planes
on 02024-09-15#Steve-Mould #video #toread on #illusions
on 02024-09-15#Chronova #video #toread on #manufacturing tiny steam-engine #mechanisms.
on 02024-09-15#Harrison-Low #video about how his #Stewart-platform juggling robot finally can juggle, two balls anyway. He actually did switch from kevlar to #UHMWPE (Dyneema) which I thought wouldn’t handle the friction heat. He shows the pseudo-capstan “hand” #mechanisms that actually throw the juggling ball. Oh, and he's using Zulip instead of Discord to make it more open. #robotics
on 02024-09-15#Harrison-Low #video #toread about redesigning #robotics joint #mechanisms
on 02024-09-15#Harrison-Low #video about eliminating knotted string from his #robotics #mechanisms by wrapping his kevlar threads around screws and then squishing it under the screw heads by tightening them. Maybe he should have just used a trucker’s hitch?
on 02024-09-15#video of #3D-printing a novelty chair in 64 pieces of plastic, held together with hot-glued dowel joints (for which he 3-D printed 173 tapered dowels) reinforced with Total Boat Thixo epoxy, which pushed the pieces apart as it expanded while curing. So he reassembled it with superglue holding the pieces in place while the epoxy cured (over a week). An eloquent description in the middle of how you feel when a project has an unexpected bad turn. He used expanding spray foam to fill a gap resulting from a version control error which resulted in printing the wrong version of part of the chair; this would have badly weakened the chair. The printing took 30–50 print days spread across 4–5 calendar days. The service bureau, "Slant 3D", buys PLA beads for US$1.50 to US$2 per “pound” (US$3.30–4.40/kg) and makes their own filament from it normally; they charged US$568 for the print, though normally they would also charge for their time doing the design.
on 02024-09-13#video on designing a clip for a “threadboard” made by #3D-printing, including concerns about layer adhesion, friction, and swivel #print-in-place #mechanisms
on 02024-09-13#video of a particle-based #game-of-life
on 02024-09-11#video playlist of #SmoothLife #game-of-life
on 02024-09-11#video of #SmoothLife #game-of-life
on 02024-09-11#video #toread about #Milei from the #China state-owned company CGTN
on 02024-09-11#video on the #history of #electronics #manufacturing in mainland #China
on 02024-09-11#video from four weeks ago on #China’s #graphite exports to #USA, which are necessary for #EVs and supposedly not available elsewhere; in December China imposed an export ban. #politics
on 02024-09-11#video on #Huawei’s new "Ascend 910C" GPU #hardware. Mostly repeating stock footage and Ken Burns Effect, not worth watching.
on 02024-09-11#video today on Russians retaking Snagost (in Kursk Oblast) and other villages from #Ukraine three days ago, mostly sourced from Russian warbloggers. Footage of captured Ukrainian soldiers. It’s believed that Blinken will visit Kyiv and authorize Ukraine to use ATACMS within Russia — today? Also Russia took Vodiane, in the south of Ukraine, and Hrodivka/Grodovka, and have entered Ukrainsk from three directions. #politics
on 02024-09-11#video on Flannery LLC aka #California-Forever trying to set up #charter-cities in Solano County, California — and suing farmers who refused to sell their land on the basis that the farmers were engaging in an illegal price-fixing conspiracy. They own like a quarter of the county now but probably won’t get the political support they need to build their planned charter city. #politics
on 02024-09-10#video from a year ago on the economy of #China, including the C919 narrow-body jet made by #Comac (established 02008), BYD’s #EVs and the Shanghai government’s support for #Tesla, the NVIDIA A100 and the petaflops Biren BR100 (fabbed in 7nm like, supposedly, the A100) and how the export controls block TSMC from making it (I guess this video is from July 02023, before the #HiSilicon Mate60 processor demonstrated SMIC’s 7nm capabilities), Nike vs. Anta (which has apparently bought Fila and Wilson), CATL vs. mostly other Chinese EV battery companies, supercomputers (mentioning the 02015 export controls), bullet trains (there's a World Bank map at 45'25" showing how Urumqi is connected), “metaverse” (pointing to pre-publication approval requirements on games), and space tourism with CAS Space. Says that in 02022 China had 173 supers on the #TOP500 list vs. 128 in the #USA, making their recent withdrawal rather momentous, and that #cryptocurrency transactions were banned there in 02022.
on 02024-09-10#video #interview with a couple of Sinologists about #China and #history: Susanne Weigelin-Schwiedrzik, from the University of Vienna, and Professor Warwick Powell, of Queensland University
on 02024-09-10#video of Scott Ritter #interview predicting imminent surrender of #Ukraine, as of two days ago, and its nonexistence this winter. Says Russia just recaptured the original 02014 line of demarcation in the Donbas, and almost the entire Cabinet resigned yesterday. Again Ritter says “de-Nazification”, which makes it especially interesting that he says that Russia is “seeking to destroy the rules-based international order, and it’s going to do that through the strengthening of the #BRICS forum,” which apparently Türkiye has just entered, and “Iran and Saudi Arabia are already in, so is UAE”. (Türkiye did indeed just enter, and Iran and Saudi Arabia are in.) But also he seems to be saying that Russia and China are trying to get India to join BRICS, which makes no sense. Ritter predicts that NATO will collapse when Türkiye pulls out. #politics
on 02024-09-10#video of Scott Ritter #interview predicting imminent surrender of #Ukraine, that Europe is “disintegrating before our eyes” because of an immigration crisis (?), the EU and NATO will collapse, etc. Seems like pro-Putin propaganda? Uncritically uses the propaganda words “Banderist” (Banderovets) and “de-Nazification”. And something about how countries like Germany wanted to “derisk” by removing their supply chains from #China, but Volkswagen was losing money everywhere else. And apparently the #USA is now in an arms race with China? #politics
on 02024-09-10#video #toread about Craigslist and other “anti-startups”
on 02024-09-10#video with Yanis #Varoufakis about #USA #politics, #China, #WeChat, and how the US in #history didn’t go bankrupt when it had a trade deficit because of Bretton Woods (?). His book is "Techno Feudalism". Cites the US and EU confiscating US$450 billion in overseas Russian holdings due to the #Ukraine war as a pivotal moment that forced people everywhere to look for alternatives.
on 02024-09-10#video #toread about #China and #EVs in #USA #politics
on 02024-09-10#CNBC #video about cars from #China. The Li Auto L6 medium family car, about the same price and size as a Tesla Model Y, includes a fridge, massage chairs, TVs, etc. Nio is one of the car companies that does battery-swap charging. Bill Russo (Automobility) thinks the new business model is monetizing data obtained after you sell the car, but it’s unclear if he’s specifically talking about one or more Chinese companies. The reporter said she felt that there wasn’t nearly as much precision when she was, for example, turning, as in a Tesla, because the cars’ performance wasn’t as good. #EVs
on 02024-09-10#video about “overcapacity” on #China and how Huachipato is shutting down, etc. #politics #toread
on 02024-09-10#video on #China/#USA politics trying to keep out electric vehicles with 100% tariffs while US car companies spend their government EV research grants on stock buybacks. High-end electric cars, electric dumptrucks, and even electric mopeds support battery-change recharging (battery-swap charging); it’s commercially deployed. They’re very impressed with how advanced all the Chinese cars are, and also positively impressed with how accommodating the auto parts manufacturers they met with were, especially by contrast to US and Canadian companies.
on 02024-09-10#video from November on #Huawei’s new #HiSilicon Mate60 #cellphones and #China/#USA #politics. “If those US [export] controls had been successful, then a smartphone as powerful as this should not be possible without importing key components” because they used 7nm photolithography.
on 02024-09-10#CodingAdventure #video on sound, the Fourier transform, fluid dynamics, etc. Starts with .wav #file-format, showing #C-sharp source code. He’s using programming #ligatures, perhaps of interest as a use spotted in the wild. He simulates propagating waves through a two-dimensional fluid simulation from a reciprocating membrane to a “microphone”. Justifies the Fourier transform with visualizations. “My faith in this implementation is as bottomless as a puddle.” Also explains the Nyquist frequency and spectral leakage, again with visualizations.
on 02024-09-10#news #video on an Iranian-made Russian drone that was shot down (?) in NATO member Lithuania on Saturday after launching from Belarus targeted at #Ukraine. #drones #politics
on 02024-09-10#Dr-Ben-Miles #video about #China building the first commercial #thorium molten-salt #nuclear #energy plant. Including an ad for the RadiaCode Geiger counter. Mislabels monazite as “monzanite” and accidentally refers to “thorium-323”. The reactors he’s describing are 233U breeders rather than energy amplifiers; not clear which type the new Chinese plant is. Also mentions other planned thorium reactor startups in maybe 02030 or 02035.
on 02024-09-10#Dr-Ben-Miles #video about why ice is slippery using new AFM research
on 02024-09-10half-hour #video on DIY sub-250-gram autonomous #drones with #Ardupilot #tutorial #toread maybe with an actual drone at hand
on 02024-09-10#video about Queen Hornet #drones carrying AK-74 gun #weaponry in #Ukraine from the maker “Wild Hornets”. Mentions that they’re also used as signal repeaters. Also, a #Baba-Yaga firing an automatic rifle at the ground. Also Russia has at least tested Molot Aero drones firing AK-74s. And the Georgian Legion fired an RPG-7 from one of their drones.
on 02024-09-10#video testing #kinematic-coupling with a laser pointer, except they don’t actually test it. #precision #mechanisms
on 02024-09-10#video #toread on #kinematic-coupling mount for a mirror. #precision #mechanisms
on 02024-09-10#video on #manufacturing #kinematic-coupling for air bearings for #precision #mechanisms. #Cylo ground a three-planed vee out of W-1 tool steel to place a bearing ball in, with slots in the sides for access, then hardened and polished it. I wonder why he didn’t just use three bearing balls? He states (incorrectly, I think) that the small contact surface area between the ball and the planes produces lower static friction.
on 02024-09-10#video on #manufacturing #kinematic-coupling #precision #mechanisms with #3D-printing by #Sonya-Vasquez. Using pairs of round metal dowels and threaded balls.
on 02024-09-10#video on #machining the end of the hardtail vise #manufacturing #toread #Abom79
on 02024-09-10#video on #CNC helical interpolation to mill holes in angle iron #manufacturing #toread #Abom79
on 02024-09-10#video on #CNC #machining a bolt circle with "conversational programming" #manufacturing #toread #Abom79
on 02024-09-10#video on turning and facing aluminum beauty rings #machining #manufacturing #toread #Abom79
on 02024-09-10#video on USAF’s "Rapid Dragon" cruise missile #weaponry with lots of talking-head footage
on 02024-09-10#video on 5-megawatt McDonnell Douglas #nitinol engine #toread
on 02024-09-10#Steve-Mould #video on #Braess’s paradox
on 02024-09-10#video #toread on writing #visual-novels #games
on 02024-09-10#video #toread on Doki Doki Literature Club #visual-novels #games
on 02024-09-10bullshit #video by "Belinda Carr" about #geopolymers claiming that geopolymer cement is waterproof because “its pores are smaller than 50 nanometers so big molecules like water can’t enter the geopolymer matrix.” PLONK PLONK PLONK
on 02024-09-10#video Overview of the current state of #3D-printing houses. Apparently the material mix requires tweaking for every job site; it’s sensitive to humidity, temperature, water temperature, “material temperature” (of the dry mix I assume), if it rains, if there’s wind, etc. As of two years ago.
on 02024-09-10#Thought-Emporium #video on holographic #optics and how commercial holographic patterns are hot-stamped, but he’s making computed holograms with a film camera and Rafael de la Fuente’s Diffractsim. Explains how diffraction works with animations and shows many other diffraction phenomena, including the Arago spot. Photographs a zoneplate on Ilford ISO 50 pan film; plans to use Adox CMS 20 super-high-resolution film. Projects the hologram from the film negative with a pinhole-aperture white LED rather than a laser. Also hopes to use photon sieves in the future.
on 02024-09-10#video on DIY #manufacturing for prototypes on a shoestring, nominally for fishing, with shitty elevator music. Many excellent techniques, very clearly filmed. Filing the jaw serrations off a clothespin. Supergluing an inner-tube section to it. Cutting it off flush with a snap-off box cutter. Softening the clothespin with a pencil butane torch. Bending it to shape with needlenose pliers. Cutting a section of broken umbrella rib with diagonal cutters. Shaping its end with a Dremel. Melting it into the clothespin with the butane torch. Forming a mold around it with masking tape and filling it with hot glue to hold it in place reliably. Adding a heatshrink handle to the metal with the torch. Using the clothespin to tie a hangman’s-noose-like knot onto a fishhook, then a similar one around the shaft of another fishhook. Cutting up a soft plastic syringe with a box cutter. Melting a round hole through its plunger with a screwdriver heated with the torch. Heating a steel spring to melt it into the end of the syringe body. Slipping the plunger through the spring and into the syringe body to form a spring-loaded plunger. Using the combination for fishhook manipulation again, and to tie knots in fishing line. Removing the remaining flux from a dilapidated stick-welding rod by crushing it with needle-nose pliers. Spinning it in a drill chuck in sandpaper to polish it. Bending it into a circle with improbably small round-nose pliers (apparently welding rod is annealed‽). Shaping the ends of the welding rod with a file and Dremel. Drilling corks with an electric wood drill. Shoving the now-pointed welding rod through the corks. Supergluing the corks in place along the welding rod. Hardening superglue with baking soda. Spinning the corks with the drill in sandpaper to even them out. Bending the rod into a pointed hook with a float. Cutting a soft plastic enteral-feeding syringe body with a hacksaw blade. Cutting it on Sharpie marks with diagonal cutters. Deburring the edges with a box cutter. Cutting the plastic with scissors. Flame-polishing the cut edge with the torch. Softening the plastic with the torch and hand-bending it while soft. Melting holes in it with a soldering iron. Improving the holes (?) with an electric drill. Melting the ends of a thin plastic tube with a cigarette lighter to get them to swell up a bit so they can’t go through the holes. Forming a plastic grommet for a wire loop in this way from a short section of plastic tube, cut with scissors. Various fishing-line knotting techniques. Puncturing a Kinder Egg at each end with a steel awl. Drilling out the holes to size with an electric wood drill. Cutting ends off a Q-tip with scissors to get a plastic tube to thread through the Kinder Egg holes. Supergluing it in place. Bending wire into a sort of cotter pin to install in the plastic tubing. Cutting a cigarette-lighter flint spring with diagonal cutters. Threading the spring and beads onto the cotter pin. Heating its pliers-bent end so a bead melts onto it.
on 02024-09-10#Segerman #video about Cannon-Thurston maps (“naturally occurring space-filling curves”)
on 02024-09-10#video by #Cesar about #hoarding HP printer/scanner #electronics #hardware recovering an optical disc encoder labeled “200 LPI” (driven from a DC motor with a toothed belt), some buttons, an external power supply, optointerruptors, a carriage mechanism (with linear tape optical encoder), another motor with encoder from the scanner part, an RGB LED strip (running on 5V with a common anode), a solar fruit dehydrator,
on 02024-09-10#video by #Integza about a “laminar-flow rocket engine”. He uses #3D-printing from K3D in the Netherlands to print part of it it from porous metal (stainless I think) so that the fuel-oxidizer mix is injected over a large area — through a gyroid that fills most of the combustion chamber.
on 02024-09-10#Cesar #video #toread about #hoarding CD and DVD drives. #electronics #hardware
on 02024-09-10"Kiriform" #pop-up deployable #flexures #mechanisms #video showing applications including furniture, luminaires for lighting, zoom lenses, etc. It depends on buckling (and therefore some kind of constraint to keep it from buckling the wrong way) and doesn’t look very rigid. “Deployable structures based on buckling of curved beams upon a rotational input” by Saurabh Mhatre et al.
on 02024-09-10#Segerman #video #toread on braiding gears, based on gripping gears. Insanely ingenious #mechanisms.
on 02024-09-10#Segerman #video: a “flórice,” a sort of flower of cyclide-shaped bananas (made by #3D-printing) that slide smoothly between being a sphere and being a disc, propelled by bevel gear #mechanisms. He calls it “slide-glide cyclides”.
on 02024-09-10#video #toread about #Starlink in #Argentina
on 02024-09-10#video about #hoarding old TVs, specifically a Samsung CW-28D83N CRT unit. He gets two speakers (8Ω 10W), a heatsink from the electron-gun driver, some resistors, electrolytic caps, ceramic caps, film caps, some zeners, etc. He thinks the yoke has “very interesting parts” because magnet wire is “very expensive” and it has a “good chunk of ferrite” and another one. He also likes recycling wires. He’s even excited about the steel wires between the springs that held the CRT in. Okay, the degaussing coil actually is pretty fine magnet wire, though I wouldn’t describe it as having “epthepthional” quality as he does. He also really likes the powerline RFI filter, which is on a separate single-layer board, and he power cable, and the flyback transformer. And the pushbuttons, and the infrared phototransistor, and the PTC overcurrent safety, and more film caps from the main board, an NTC probe, the bridge rectifier, some 7805-family regs, more resistors and electrolytics and inductors, and the big chopper transformer, and the hard-to-find big transistors for driving the deflection yoke. He keeps saying each diode is Zener, which makes me wonder if he just thinks all diodes are Zener diodes, except for a couple of Schottkys; I think he also maybe identified a couple of MOVs as ceramic caps, but maybe I’m just misidentifying ceramic caps as MOVs. He likes the TDA7297 audio amp chip and the heatsinks. Oh, toward the end he identifies an epoxy power rectifier as a diode without saying it’s a Zener, but then he misidentifies the glass signal diode next to it as a Zener, despite being contradicted by the silkscreen. This is kind of borderline; I don’t think this quite deserves a plonk for “electro jungla”, but it’s so not a high-quality video. #electronics #hardware
on 02024-09-10#Cesar #video about #hoarding #cellphones #electronics #hardware
on 02024-09-10product shill #video on the #Uni steno keyboard from stenokeyboards.com, which is US$25–90, using #Plover. Some stock footage of court reporters; the YouTuber here is a beginner. Recommends the Typey Type website and the Plover Discord to learn.
on 02024-09-09#video #toread about an interview with a sniper in #Ukraine
on 02024-09-07CNN News #video saying #Ukraine blew up an oil refinery near Moscow with #drones last weekend (shown in cellphone video), Russia having shot down 160 of the drones of the attack wave. Another cellphone video shows some kind of industrial facility on fire in Konakovo in Tver, reportedly an energy facility, about 500–600 km away from the line of battle. Ukraine hadn’t done this before because its long-range missiles had been supplied by Western allies who forbade it. Also discusses #Durov’s arrest in #France and Russia’s concerns about Telegram opsec — the Russian military has been “instructed to stop using Telegram”. #weaponry #politics
on 02024-09-07#video from two weeks ago on Western tank #weaponry in #Ukraine, such as the Kampfpanzer Leopard 1 with its 70mm RHA and rifled 105mm gun; the US$6 million, 70-tonne Leopard 2 with its smoothbore 120mm gun and composite armor, and at least 130 deployed to Ukraine, at least 32 damaged or lost so far (8 of these being repaired); the Stridsvagn 122+, a Leopard 2, with 10 deployed and 7 lost; Britain’s 70-tonne Challenger 2, with its 120mm rifled gun, 14 deployed and one lost so far, the first Challenger 2 lost to enemy fire anywhere in the world (the comments say a second one has just been lost in the Kursk offensive); and the 66.8-tonne turbine-powered M1 Abrams, with its 120mm smoothbore gun, 31 deployed, 10 lost. Ukraine has lost 857 tanks so far: 585 destroyed, 72 damaged, 66 abandoned, 134 captured. Their T-64 tanks were more useful for minefields because they had mine rolles, unlike the Western tanks. They say the Polish PT-91 Twardy, an upgraded T-72, has been the most useful. But somehow the video also says that the Western tanks are intimidating, advanced, and scare Russian soldiers with just the sound of their engines, even though it sounds like it’s the T-64s and T-72s that have been most useful. “#Drones are actually the reason many military experts believe tanks have been made obsolete in modern warfare, at least until the technology and tactics catch up,” and Russian drones took out at least five of the 10 Abrams tanks Ukraine has lost, prompting to remove them from the front lines. #politics
on 02024-09-05#video #toread from five days ago saying the #Ukraine front in Donbas is collapsing #politics
on 02024-09-05#video #toread about #Meshtastic #decentralized #radio
on 02024-09-05#video #toread about #Palmer-Luckey and #Anduril #weaponry #toread
on 02024-09-05#video #toread about "UGVs" in #Ukraine, ground #weaponry #drones
on 02024-09-05#video #toread about #Ukraine “vampire” rocket #weaponry attacking Russian city
on 02024-09-05#video #toread from two days ago about Kursk defensive lines. #Ukraine
on 02024-09-05Sun #video of #Ukraine drone destroying other #weaponry #toread
on 02024-09-05#video claiming #Milei has gotten #Argentina out of recession #toread #todelete
on 02024-09-05#video in Spanish about whether #Milei’s plan is working from #Bloomberg. #politics #Argentina
on 02024-09-05#video #toread about #PID #control vs. other methods like model-predictive control
on 02024-09-05#video #toread about #3D-printing woodworking tools #bootstrapping #manufacturing
on 02024-09-05#video #toread about #3D-printing tools #bootstrapping #manufacturing #teaching-tech
on 02024-09-05#video #toread about pioneers (?) of nano #manufacturing
on 02024-09-05#Breaking-Taps #video about #MEMS accelerometers. He uses a lot of electron #microscopy to show the #flexures and other #mechanisms, then makes macroscopic replicas with #3D-printing. I don’t understand the whole flexure layout, but I appreciate the effort. He says the “gyros” use the Coriolis force generated from resonant vibration, which changes their resonant frequency. I don’t know. #toread
on 02024-09-05#video #toread about “a deep dive” into Canon’s #nanoimprint lithography #manufacturing
on 02024-09-05#Malawey #video #toread on different kinds of tape
on 02024-09-05#video #clickbait on repairing earbuds #toread
on 02024-09-05#video #toread #OCW on power #electronics #hardware (43')
on 02024-09-05#ElectroBOOM #video #toread #formina on how to turn an LED on #electronics #hardware
on 02024-09-05#Electronoobs #video on #PID #control of a 220VAC heater with a triac #electronics #hardware
on 02024-09-05#video #toread about a YouTuber returning to his home in #Argentina
on 02024-09-04#video about whether #Milei’s plan is working from #Bloomberg. Basically the reporting is extremely positive, I think unrealistically so. #politics #Argentina
on 02024-09-04#video of part of Ann Hardy’s oral #history #interview with the Computer History Museum, covering the history of Tymshare through the late 01960s to the early 01980s
on 02024-09-04#video on #manufacturing SO₃ #materials #bootstrapping by #NurdRage. I didn’t know you could dehydrate H₂SO₄ with H₄P₂O₇! But he’s dehydrating it with Na₂S₂O₇ instead.
on 02024-09-04#video on the Sharp #memory-LCD I have; Andrej reports that it works fine at 10 megahertz even though it’s only specced for 2. That’s 100fps!! #electronics #hardware
on 02024-09-04#video showing the difference between #geyser-pump #mechanisms and conventional pneumatic ejector pumps #airlift
on 02024-09-04#video showing a very easy construction technique for #geyser-pump #mechanisms using a couple of plastic bottles and a tube. #airlift
on 02024-09-04#video showing how a transparent #geyser-pump works, part 3 of 3. #airlift #mechanisms
on 02024-09-04#video showing how a transparent #geyser-pump works, part 2 of 3. #airlift #mechanisms
on 02024-09-04#video showing how a transparent #geyser-pump works, part 1 of 3. #airlift #mechanisms
on 02024-09-04#Shake-the-Future #video on his “print-wave casting” #manufacturing technique with #3D-printing
on 02024-09-03#Blondihacks #video on #manufacturing a tool sharpener (part 3). Also mostly lathework on laser-cut steel and drilling in a mill with a DRO. She’s mostly working on a table in this part, with a couple of four-bar linkages permitting two degrees of freedom of translation with no rotation. Demonstrates round-head screws for using threaded holes as references, an improvised hose-clamp-driven collet, etc. #machining
on 02024-09-03#Blondihacks #video on #manufacturing a tool sharpener (part 4) #machining. Mostly lathework on laser-cut mild steel, with some milling, and discussion of a machining error, how to avoid it, and how to compensate it.
on 02024-09-03#video #toread on #3D-printing a #wire bending machine
on 02024-09-03#video on making a #wire bender with a nut and a bolt. The thumbnail shows slotting the bolt, stepping the nut, and welding a handle to it, but in the video he cuts a step in the bolt and then a slot in the bolt (with an angle grinder). Then he does MIG-weld a handle onto the nut. Horrific elevator music. Then he cuts a step in the nut. This seems like a terrible design: it relies on the thread to locate the two bending parts, which are a non-adjustable distance apart, and then restricts bends to 90° or less. #Plonk to "Relietron".
on 02024-09-03#video #toread on a Japanese #wire bending tool
on 02024-09-03#video #toread on #manufacturing a #wire bender
on 02024-09-03#video #toread on DIY mini #wire bender
on 02024-09-03#video on bending #wire to make fishing lures. Shitty elevator music. Dremel and angle grinder applied to a screwdriver to make it a sort of inverse screwdriver with a slot in the rounded end for the wire. Hacksaw blade on aluminum tubing tightly fitting over the screwdriver shaft, cut off at the end of the cutoff shaft. More slots cut into the end of an Allen wrench with the angle grinder. Diagonal cutters and round-nose pliers to put a loop in the wire. The slot in the end of the screwdriver grasp the wire loop to rotate the wire; the slots in the Allen wrench convert that rotational movement into tightly twisting the wire around itself. This would be a significant upgrade to my wire-bending capabilities. Round-nose pliers bend the wire end into half a loop; serrated-jaw needlenose pliers crush it into a tight hook and then put sharp bends in.
on 02024-09-03#video on bending and soldering #wire and thin brass tubing into literal wire frames. Mostly #soldering. Recommends cross-lock tweezers or leather gloves to hold hot metal, especially brass tubing. Stretches his copper wire to straighten it, first tying one end around a clamp attached to his workbench and winding the other around his pliers. Sands the (uninsulated, 1mm) wire before tinning it and then soldering butt joints. He laser-prints a template on paper to work from. He uses electronics flush-cutters to get flat ends on his copper wires. To avoid a blob or spike on each joint, he drags the iron away from the joint. For a thicker frame he uses brass tubing (2mm?), cut with a Dremel. To get a perfect circle you can wind the tubing around a jar or something, which gives springback, or you can use a small roll bender. To align the ends of the circle around the gap, he cuts off some welding rod with the Dremel and sticks it into the ends of the tube, so that the solder he later applies won’t have to bridge an offset. He solders the brass tubing with the same 30 or 40 watt soldering iron and the same rosin-core electronics solder, then files the solder smooth with a file. To get sharp bends in the tubing he V-notches it with the Dremel. A flap sanding wheel on the Dremel also helps to deburr the solder. Shitty elevator music.
on 02024-09-03#video on bending #wire with a wire bending jig for #manufacturing fishing lures #toread
on 02024-09-03#video on #manufacturing a 2-stroke engine from mostly raw materials but also a piston and connecting rod
on 02024-09-03#video on how woodworkers use drill presses, including to resharpen their chisels with a sanding disc and a wooden sharpening jig, and how to not use them
on 02024-09-03#video on bending 3mm music wire with a Micro-Mark #60346 Mini Wire Bender tool for radio-controlled #drones #mechanisms (landing gear, pushrods, etc.) For thin wire you can just use heavy-duty pliers. He recommends making Z-bends by first using all three dimensions and then flattening back into two. Basically the Micro-Mark tool is a miniaturized version of a rebar bender. He obviously has a lot of practice because he freehand bends multiple perfect 90° angles, seemingly compensating for the wire’s springback purely by intuition. For cutting the 3mm wire he recommends a Dremel instead of something like a bolt cutter.
on 02024-09-03#video #toread on #manufacturing a water-cooled bed
on 02024-09-03another #video on #manufacturing #ethylene #materials automatically by #Hyperspace-Pirate. He wants to use it as a second-stage refrigerant for his vapor-compression cryocooler for #cryogenics. He wants to separate ethanol into ethylene and water over a propane-heated sapphire catalyst (Wisesorb activated alumina from wisesorbent.com in 3.5mm balls) at 450°, which is fucking awesome. Around 300° to 350° you would instead get ether, and above 550° you mostly get carbon and hydrogen, the production of which starts at around 500°. Between 400° and 500° you mostly get ethylene (and water). Aluminum pipe contains the catalyst (and a thermocouple for temperature control), and copper line and flare nuts move the ethanol and ethylene vapor around. The pieces are supported on cinder blocks and bricks on what looks like a concrete floor. Bubbling the output through water produces a lot of flammable gas, which is probably ethylene. He adds a plastic juice bottle full of water as a bubbler to remove particles and a second plastic juice bottle full of silica-gel desiccant to separate the ethylene from the water, and then a dust filter to remove particles of the silica gel. He bolts together some aluminum L-profiles to hold things in place and 3-D prints a fixture for the bottles. A “25-foot” condenser coil of copper line with a fan blowing on it serves as a heat exchanger to cool the hot ethylene to near ambient. A second bubbler collects the liquids, which include a significant amount of ether. He collects the ethylene output in a beach ball. He uses a fridge compressor to pump it from the beach ball into a pressure tank previously purged with propane. His 500cc of 151-proof Everclear turned into 69.7g of ethylene, only a 39% yield, probably because he made about 50 grams of ether. On a second run he used a higher catalyst temperature and got a 70% yield. Chemical engineer in the comments: “It absolutely blew my mind to see someone casually building a packed-bed plug-flow reactor from plumbing parts and unspecified alumina beads in his garage, and the damn thing actually working! Seriously, well done! (Deep down I’m almost insulted by the fact you managed to get a decent yield without doing any equations to work out the reaction rate, and therefore flow rate and reactor length required 😂)” but he also suggests that the output ethylene product is probably contaminated with a lot of ether.
on 02024-09-03#video #toread on #manufacturing #ethylene #materials automatically by #Hyperspace-Pirate
on 02024-09-03#video on graphite #weaponry against power lines. Low-quality animation.
on 02024-09-03#video on anti-drone #weaponry cages on tanks #toread
on 02024-09-03#video on square nuts for #3D-printing inserts #toread
on 02024-09-03#video on lithium hydride reducing agent #materials #toread
on 02024-09-03#video on the hazards of #3D-printing with carbon-fiber reinforced filament #toread
on 02024-09-03#video #toread on #manufacturing a #cold-plasma torch
on 02024-09-03#video on desoldering #electronics #toread
on 02024-09-03#video #toread about someone who fled the #USA for #Argentina #politics
on 02024-09-02#NileRed #video about metal glass #materials, specifically Vitreloy 1, an alloy of zirconium (41.2 mol%), beryllium (“the asbestos of metals”, 22.5%), titanium (13.8%), copper (12.5%), and nickel (10%). Shows how to make a lab-scale arc melter from a common arc welding power supply! Tungsten electrode, water-cooled copper crucible, argon-filled glass chamber. But he ended up buying one on AliBaba instead; the final price was US$14440, including US$1570 of freight. Vitreloy 1 vitrifies when cooling even as slowly as 1°/s, so the water-cooled copper crucible was enough. Really astonishing viscous glassy goo behavior at 36'43", like sugar syrup instead of any metal I’ve ever seen. (It also shatters like glass when he cuts it with bolt cutters). He found suction casting of the Vitreloy to be very difficult, as on his first four attempts the metal didn’t fill the mold at all. On his fifth attempt, with 30% more metal, he successfully cast a metal disc, and similarly on attempts 6, 7, and 8. But then it wasn’t insanely bouncy like he expected, a problem he was able to fix with superglue. Video has a comment by “jaskaran_singh_saini” saying, “The metallic glasses I invented have been the most recent major advancement in this area. (...) The thing Nile mentioned about the metallic glass not being safe to grind and polish because of beryllium is not true. Once the beryllium has been absorbed into the metal matrix, it is very safe. I literally produced thousands of these metallic glasses in my lab during my PhD, and some in very big sizes and they are all safe.”
on 02024-09-02#Breaking-Taps #video on high-entropy alloys #toread
on 02024-09-02#video #toread #formina on visiting #Argentina and seeing the Subte
on 02024-09-02#video on #optics at #ASML by Huygens Optics, discussing how getting more than one order of diffraction from your shadow mask into your imaging optics can improve the resolution of the resulting image. #precision #manufacturing
on 02024-09-02#Advanced-Tinkering #video on #vacuum #toread
on 02024-09-02#Alpha-Phoenix #video on #UHV #vacuum for molecular beam epitaxy (#MBE), explaining copper gaskets. Apparently MBEs are all equipped with quadrupole mass spectrometers to help in tracing UHV leaks, which give you a molecular mass spectrum calibrated in daltons, which is pretty cool since you can see spikes for individual isotopes, and you spray helium at your flanges. He also used a random bubble-wrap bag to raise the helium concentration around the suspected leak, and some masking tape to tape off a candidate joint. He mentions that there’s a kind of epoxy “leak seal” option when tightening the bolts isn’t good enough. An unfortunate amount of talking-head footage, but still informative.
on 02024-09-02#Advanced-Tinkering #video on turbomolecular problems. #vacuum #toread
on 02024-09-02#Breaking-Taps #video on doping silicon with lasers. With phosphoric acid. Explains how his IR fiber laser penetrates too deeply to be ideal and how hot-probe tests find positive (Seebeck?) voltage for N-type doping, as produced by phosphorus, and negative voltage for P-type doping. But he hasn’t been able to fabricate a PN junction on his P-type wafer yet. So apparently to avoid Schottky contacts you have to use “titanium and aluminum” (titanium-coated aluminum?) for the N-type probe and just plain aluminum for the P-type probe (or a highly-doped N-type region), both annealed at 480°.
on 02024-09-02#video #tutorial on #vacuum for electron tubes by #Signal-Ditch, explaining atmospheres, pascals, bar, torr, and millimeters of mercury, Pirani vacuum gauges, ion vacuum gauges, thermocouple convection vacuum gauges, and capacitance manometers. Mostly cartoon animations and screenshots. But he has a long series of hand-drawn diagrams about the design of his high-vacuum system, step by step.
on 02024-09-02#video playlist #toread on easy #electronics experiments; the first recycles an RF modulator from a VHS VCR to modulate a signal from an analog security camera. #hoarding
on 02024-09-01#Malawey #video #toread on reproducible battery energy experiments
on 02024-09-01another #Malawey #manufacturing #video. JB-welding coaxial things inside a brass sleeve, which failed between 60 and 80 “inch-pounds” (7–9 N m) maybe because he didn’t let it set long enough. He says you can bond silicone to already-cured silicone (like a silicone sheet bought from the store) with full strength, so you can use it to jugaad things together, like an insulating pad he put on his magnetic-stirring hotplate, and an extra finger grip for his soldering iron, and his custom soldering rack with a silicone tube inside a steel tube. You can mix white silicone with any oil paint. Demonstrates how he can reuse a polyethylene cup after mixing white silicone with blue pigment in it. Demonstrates melting hot glue (EVA?) with a heat gun to make a light diffuser over a LED. Describes which plastics are annoyingly glue-resistant. Talks about Liquid Nails and similar construction adhesives, which he says are basically pasty wood glue (I think that’s chemically false) because it’s sandable and paintable, stronger than wood, water-resistant, shrinks when it dries, and washes off with water when wet (water cleanup). Then points out that non-water-soluble construction adhesives are totally different. He says the pasty stuff is better at filling gaps and so sometimes stronger in practice, though weaker in theory. Explains that J-B Weld does make something of a chemical bond with metal, not a purely mechanical one. Peels cured J-B Weld off a bicycle inner tube segment. Shows nylon resisting J-B Weld adhesion. Demonstrates how J-B Weld can be popped off ABS and soft polyurethane with some force. Taps 30-hour cured J-B Weld with a combined drill and M4 tap. He 3-D printed a PVC cement can lid grabbing tool! Then he gets off talking about Bondo and epoxy resin composites and whatnot. Demonstrates soaking nylon webbing in epoxy to somewhat stick it to other nylon webbing. Recommends E6000 or a similar contact cement like Weldwood for sticking to things like smooth, shiny polyethylene, but it still won’t withstand any substantial amount of tension or peeling. He did manage to glue nylon webbing by impregnating it heavily with black ABS cement! The adhesive he tried on EVA foam (Titebond PVC trim adhesive and sealant) didn’t stick, and between two sheets of nylon it didn’t even set.
on 02024-09-01#video on DIY #mechanisms from 01910, including improvising with tin snips and metal from a computer power supply
on 02024-08-31#video #toread about #manufacturing TeO₂ glass #materials with bright fluorescence
on 02024-08-31#video #toread about #iPhone taking your picture every 5 seconds. #privacy
on 02024-08-31#video of ant lion successfully catching and eating mealworms and cockroaches
on 02024-08-31#song #video #toread Emilia, Ana Mena, “Carita Triste” #todelete
on 02024-08-31#video #toread Nicki Nicole new #song “Doctor”
on 02024-08-31#video #toread on changes in #Argentina since the 01990s
on 02024-08-31#video #toread on tiny Soviet pentode #electronics #hardware
on 02024-08-31#video #toread about reusing OTP EPROMs from the guy who explained how to reuse 8051s. #electronics #hardware
on 02024-08-31#video #toread about 8-bit #microcontrollers becoming obsolete, from the guy who explained how you can reuse 8051s. Or, rather, he claims that components can’t become obsolete. “Has anybody in their right mind ever said that 74-series logic is obsolete?” Yes, I think so, use a CPLD. Video quality is not good. #electronics #hardware
on 02024-08-31#video of #bootstrapping dichromate #materials from stainless? He starts by dissolving 18/0 stainless steel forks in 98% H₂SO₄. To 789g of forks and 250g H₂SO₄ he added water. He got hydrogen bubbles and a green solution and the plastic tub started melting from the heat, so he added distilled-water ice. He used 920g sulfuric acid total. After three days much of the forks had dissolved. After a week much of the forks were dissolved and he lost patience. He tried to separate the iron sulfate from the chromium sulfate with a water recrystallization and got a lot of it out. He had 127 grams of forks left, so 662 grams dissolved. A third vacuum filtration removed most of the carbon powder. 1.5kg of sodium carbonate, a large excess, converted the chromium sulfate into hydroxide and the residual iron sulfate into iron (II) carbonate. He said a lot of the iron (II) sulfate had oxidized to iron (III), but I’m not sure if this was caused by the alkalization. The sludge settled somewhat during the night, so he siphoned off some sodium sulfate supernatant, starting the siphon with a syringe. Gravity filtration through cotton balls in plastic water bottles over two weeks concentrated the sludge somewhat, draining his soul. Then he oxidized it from Cr(III) to Cr(VI) with 760g of calcium hypochlorite. Vacuum filtration for four hours was able to separate the precipitated iron hydroxide, leaving a urine-like calcium [mono]chromate solution, which he boiled down for another week, periodically filtering out the precipitated chromate crystals. For disposal, he reduced the contaminated waste chromate with sodium sulfite in a hydrochloric acid catalyst. A reaction with more H₂SO₄ converted his yield of 62.5g of calcium chromate dihydrate to dichromate, precipitating out all the calcium as sulfate. To finally switch it to K₂Cr₂O₇ he added potassium carbonate, expecting a CaCO₃ precipitate, but what he actually had was dichromic acid at that point. He neutralized it with KOH and boiled it down further and did more vacuum filtrations to crystallize 40g of K₂Cr₂O₇, a 12% yield.
on 02024-08-28#video #toread of #manufacturing an 1890s-style Japanese blowtorch from brass
on 02024-08-28#video of pharmacist Ina Yu’s reactions to NileRed videos #humor
on 02024-08-28#video on #narcosubs, which supposedly cost US$1–2 million each; cites the first famous 02006 capture of one. Diesel-powered, generally 12–20m, 3–12 tonnes of cargo, human or remotely operated. Some have executed trans-Atlantic crossings to, for example, Galicia. Shitty #Megaprojects video with talking heads, stock photos, and stock footage. In 02020 an electric one was found with 10 tonnes of batteries, but probably would be towed by a surface ship for most of its distance. US Coast Guard estimates that it captures 10% of narcosubs.
on 02024-08-28#video of the police beating up #Argentina retirees who were protesting. Commentaries by Guillermo #Moreno. #politics
on 02024-08-28#video saying that the #NATO #Ukraine council is holding an emergency meeting in the wake of Russia’s bombings of Ukraine on Monday and Tuesday.
on 02024-08-28#video on how #Durov’s arrest has created an international incident between #France and the #UAE, who have frozen a €10 billion deal to purchase 80 Dassault Rafale jets from France. Shitty #Oneindia video of stock photos, irrelevant stock footage, stock music, and chyrons. The UAE foreign ministry says it’s closely following Durov’s case.
on 02024-08-28#video on #manufacturing #optics by #machining pure copper (to eliminate inclusions enriched in other elements that can cause tearout) with a monocrystalline diamond cutter. Lots of footage from atomic force #microscopy and scanning electron microscopy. To eliminate 50μm steps between adjacent passes of the diamond milling cutter, he switched to 0rpm, just using his milling machine as a sort of shaper, and got the surface roughness down to about 13nm. #Breaking-Taps
on 02024-08-28#WSJ #video on #Shahed (131, 136, and 238) #drones from #Iran in #Ukraine, described as “cheap”. The 238 has jet propulsion, but the 136 uses a four-cylinder piston engine (after an initial rocket boost) and has 1500 “miles” (2400km) of range, 11.5 “feet” of length (3.5m), 441 “pounds” of weight (200kg plus spurious precision) with a 100-“pound” payload, and US$50000 of production cost, 1/600 of the Reaper. Moscow plans to manufacture 6000 of them by 02025. #weaponry
on 02024-08-28Anti-US propaganda #video from the Hindustani Times on how #Houthi rebels in Hodeidah attacked Greek oil tanker MV Sounion in the Red Sea on August 23, which continues leaking oil, which is on fire. Amazingly, no deaths are mentioned. Video sourced to “Ansarullah Media Centre”. #politics
on 02024-08-28#video #toread reviewing a #Snapdragon “perfect” “unusable” laptop
on 02024-08-28#video from two weeks ago on swarm #weaponry #drones likely to be deployed en masse in #Ukraine. Mostly talking about optical navigation by waypoints for terminal guidance to defeat GPS jamming, though, rather than swarming; emphasis is on attacking tanks, Russian reconaissance drones, and in one case a helicopter. Says Ukraine “may well be ahead” of Russia, weakly contradicting other recent reporting. #politics
on 02024-08-28#video #toread on #Raspberry-Pi “diy fighting stick” #hardware #todelete
on 02024-08-28#video #toread on Belarus possibly invading #Ukraine #politics
on 02024-08-28#video on new Trump anti-Harris ad. #USA #politics #toread #todelete
on 02024-08-28#video on #Israel #politics news (anti-Israel propaganda) #toread
on 02024-08-28#video on LCD SLA #3D-printing at costs competitive with injection molding (an ad for #Merit3D). New UV Basics Hard Black resin from Photocentric has pricing of “only” €20/kg; he says prices are 4–5× the costs of thermoplastics because thermoplastics are “already a commoditized item”. Shitty video consisting of 80% talking heads, stock footage, and even stock photos. He holds up an example molded part and says an injection mold would be US$10k to US$20k, and then each part would cost 75¢, while with his company’s machines, it’s US$2–3 per part. For smaller and more complex parts, he says the breakeven point where injection molding is cheaper is closer to 5 million parts. They’re a service bureau rather than a printer vendor. #manufacturing
on 02024-08-27#video about a couple in #Ukraine who left Beryslav, near Kherson, after kamikaze #drones bombed their house. Now they’re scared of thunder and wasps. The claim is that there’s no military presence in Beryslav, which has shrunk from 11000 people to about 1000 after hundreds of drone casualties, including 16 deaths. Contrary to what Business Insider’s Russian deserter said, the civilians believed they’d be safer going out at night, when the drones couldn’t see them; in one case a drone blew up an ambulance. It says Russia “quickly caught up” to Ukraine’s initial lead in drone #weaponry. The only hypothesis offered by the Ukrainians is that Russian drone operators are using Beryslav for target practice. A Russian post on Telegram says there are no civilians there, so they’re destroying vehicles to deprive the enemy of mobility. #DeutscheWelle
on 02024-08-27#video about Russian soldiers fighting in #Ukraine. Interview with an escaped soldier by #Business-Insider. Makes it sound like the no-man’s-land trench warfare of WWI. He talks a fair bit about #drones, saying that the “night birds” all use thermal cameras, and also describes how he amputated a fellow soldier’s gangrenous arm with an axe. Also, accidentally crawling over corpses trying to hide from a drone. Later he crawled off the battlefield, unable to walk, after getting a grenade from a “night bird”. He relates an incident of two of his companymates getting executed for insubordination (“zeroed out”) because they refused to go to a post where “Baba Yaga” was “fucking them up real bad”. On another occasion he was going to be executed and dumped in a mass grave for supposedly deserting.
on 02024-08-27#Kartik’s #video visualizing postfix notation similar to #Forth #UX
on 02024-08-27#video by the Times of India with anti #Israel propaganda by the al Qassam brigades; lots of footage of RPGs
on 02024-08-27#video dramatizing #AI-safety #toread
on 02024-08-27#video on today’s #Hizbullah attack on #Israel from Lebanon and Syria. The script is full of very strange euphemisms, like Viagra spam. Pro-Israel propaganda. #politics
on 02024-08-27#video on a desktop nanoimprinter for research which unfortunately seems to be mostly stock footage. #nanoimprint
on 02024-08-27#video on #weaponry against #drones, nothing interesting
on 02024-08-27#video on #weaponry #drones in #Ukraine, and in particular Ukrainian company Saker’s autonomous target identification software, which has reportedly already destroyed Russian targets in autonomous mode. And then #Anduril. “The cost of killing is getting scarily low.”
on 02024-08-27#video on #Ukraine invading Belgorod, just a #NIT voiceover on stock footage. Video is trash. #politics
on 02024-08-27#video on #neural-networks real-time face swapping #deepfakes with iperov’s open source DeepFaceLive without even a GPU #toread
on 02024-08-27#video on #neural-networks like Luma Lab’s Dream Machine, Kling, and Runway’s Gen-3 Alpha, generating videos; I got 10 out of 17 right guessing which were real and which were AI-generated. Also mentions Udio and Suno, neural networks which make songs.
on 02024-08-27#video interview with a diagnosed psychopath
on 02024-08-27#video by #GreatScott from two years ago endorsing the #Raspberry-Pi RP2040 Pico #microcontrollers #hardware #electronics
on 02024-08-27#video showing #Forth #retrocomputing with #F83, #F-PC, CHForth, and volksForth running under MS-DOG in DOSBox on a Raspberry Pi
on 02024-08-27#video including a #Ukraine tank invading Kursk getting hit by “Lancet” drone #weaponry and a US-made M1 Abrams tank on Russian soil
on 02024-08-27#video #toread of “turning my home workshop into a robot factory, DIY industrial robot arm, part 1” #manufacturing #automation
on 02024-08-27#video #toread of #bootstrapping #manufacturing potassium permanganate from 40g MnO₂, 55g KOH, 30g KNO₃, 5.5% NaOCl, and 31% HCl #materials #scouting
on 02024-08-27#Clough42 #video of #3D-printing tool drawer organizers for micrometers, calipers, squares, and other metrology tools, using #Gridfinity. Shows #smart-tweezers in passing at 3'35". He prefers PETG or ABS for the drawer organizers because PLA is too brittle.
on 02024-08-27#video of #Helmke #3D-printing some #mechanisms out of plastic to sort and assemble parts pneumatically with a magazine-fed pneumatic parts feeder for his screws. Sucking them through with a sort of aspirator helped solve some bouncing problems he was having that gave him backwards screws. Finally he wires them together with a CAN bus. #automation #manufacturing
on 02024-08-27#video of #NurdRage making chloroplatinic acid #materials #bootstrapping #scouting
on 02024-08-27#video explaining Condorcet’s paradox, Arrow’s paradox, and the basics of #social-choice theory, popularizing several different voting methods
on 02024-08-27#video #EEVBlog about oscilloscopes and designing test engineering #electronics instruments
on 02024-08-27#video about the book “Practical #Electronics for Inventors”, basically just paging through the book
on 02024-08-27#Malawey #video on #precision #mechanisms with #3D-printing: “Borrow a Tolerance!” Lots of wisdom about mechanical engineering and which industrial #manufacturing processes have which drawbacks. He shows a 3-D printed collet as one example of a non-borrowed good tolerance. Demonstrates some 3-D printed springs in I guess ABS, but says you can “borrow a [precision] spring rate” from a spring-steel binder clip, which also doesn’t creep at “any temperature a human can survive”. Borrowing smoothness and toughness from HDPE tubing (from water systems) to make hinges; he sharpens it in a pencil sharpener to get it to go through his #print-in-place hinges more easily. His print-in-place approach has support material between parallel horizontal layers which must be broken free with a spatula or hammer.
on 02024-08-27promo #video on #Anduril’s Pulsar #weaponry
on 02024-08-27#video #toread on programming #video-games with your own engine
on 02024-08-27#video #toread on rejecting programming with “SOLID” #todelete
on 02024-08-27#video #toread on regretting using #Rust
on 02024-08-27#video #Linus on #neural-networks and their possible usefulness for programming
on 02024-08-27#video on #Ukraine #drones #weaponry being caught up with by Russia. Says the Russians have five times as many drones on the front lines, though the number of Ukrainian companies licensed to sell the government drones has risen from 7 “last year” (02022) to 70 “this” year (02023). #politics
on 02024-08-27#video #toread on #drones and #weaponry in #Ukraine
on 02024-08-27#video #toread on treadmill crane #mechanisms #history
on 02024-08-26#video #toread on #quantum-computation (interview with Peter Shor) by #Qiskit
on 02024-08-26#Steve-Mould #video on what I thought was scanning probe #microscopy but is actually deforming a gel and illuminating its opaque surface with a ring of six lights in front of a camera using the "photometric stereo technique" to measure things to ±4μm #precision.
on 02024-08-26#video on #Gaussian-splatting, just flying around a sample scene with something called “emx”
on 02024-08-26#video by Mikkel deMib on pit-firing #ceramics #materials with glaze, which he says is “theoretically impossible” I guess because you’ll lose the pit-firing colors. He’s going to try on a porcelain vase he previously glazed the inside of at 1260°, which he says will guarantee that it’s waterproof anyway. Also his idea of “pit firing” seems to involve a steel drum; I think he's just calling it “pit firing” because he’s using wood, even though no pit is involved anywhere. He colors his once-fired white porcelain with ferric chloride, and cobalt sulfate, and some rotten banana peels, and copper carbonate, and salt, and steel wool, and newspaper, and coffee grounds, and eggshells, all wrapped up in “tinfoil”, probably aluminum foil, because he probably doesn’t know the difference between aluminum and tin. To stick the “tinfoil” to the ceramic he uses hairspray or spray glue. Some of the “tinfoil” survived until the end of the “pit firing”. It all kind of looks horrible; he keeps saying it looks “much more interesting” but to me it looks like mold grew all over it.
on 02024-08-26#video #toread with #ceramics pit-firing tips and tricks
on 02024-08-26#video #toread on #Godot #performance and profiling
on 02024-08-26#video #toread on #Godot #performance with occlusion culling
on 02024-08-26#video #toread #tutorial on #Godot HUDs and life bars and stuff, in Spanish
on 02024-08-26#video #toread on #Godot #concurrency
on 02024-08-26#video #toread #infovis of the deaths of WWII #history
on 02024-08-24new #Haijun-Xia #video #toread about #UX and #neural-networks, “redesigning the information space”, including some of his older work
on 02024-08-24"GENESYS" #animation system from the 01970s #UX #video
on 02024-08-24#Bret-Victor #multitouch #UX “Inventing on Principle” #video; this point shows his #animation program prototype, with the rabbit and the leaf, using quasimodes and “performing with my hands”
on 02024-08-24#3D-printing experiments on material properties of thermoplastic elastomers such as TPU, with a Charpy hammer test and tensile strength. #video #CNC-Kitchen
on 02024-08-21#video of #manufacturing #woodworking tools by #3D-printing: templates for a router, an air guide for a router vacuum cleaner, a T-square with holes at 1-mm increments for drawing parallel to an edge (printing the first layer in a contrasting color), screw pattern guides for particular hinges, a drill guide for putting your Forstner bit the right distance from the edge of a plywood panel, a clamp with a rather oversized screw thread, and a scribing tool for transferring the outline of a wall onto the edge of a board you want to cut. #bootstrapping #scouting
on 02024-08-20#video of Casey #Muratori explaining #ImGUI
on 02024-08-16#video #formina about how the job market for programmers has changed, 11 minutes.
on 02024-08-14#video #formina about how to learn how to program: learn by doing, learn to program rather than learning a programming language, create a roadmap, prioritize understanding, and get used to failing.
on 02024-08-14#video on Terence Tao talking about using #neural-networks in science and mathematics. “In particular, in situations where the #AI output can be independently verified, there are many promising applications, both in the sciences and in mathematics.” In particular, proof assistants. XTX sponsored both his talk and an AI math competition. He’s using #LEAN. Mostly he’s talking about collaborating in larger groups of humans using LEAN and other proof assistants, though, not the actual AI stuff.
on 02024-08-14#video on how Alec Steele’s gas forge at 1300° can barely begin to forge his US$800 5kg tungsten cube
on 02024-08-14#video saying there’s an arrest warrant out in Germany for Vladimir Z., citizen of #Ukraine but based in Poland, for bombing the Nord Stream pipeline with a yacht hired in Rostock (?). #politics
on 02024-08-14a #video from today about #Putin and #nuclear-war of some dumb fuck talking to a camera (former NATO Deputy Assistant Secretary General for Emerging Security Challenges Jamie Shea). He doesn’t think Russia is likely to use tactical nukes because, for example, “their relationship with China would suffer enormously”. #politics
on 02024-08-14another #video from today about #Ukraine advancing into Russia #toread #politics
on 02024-08-14#video from today about #Ukraine advancing into Russia #toread #politics
on 02024-08-14#video from CNN on #Ukraine invading the Kursk oblast and taking 74 Russian settlements there including Oleshnye and Sudzha. So “Western supplied armor” is invading Russian territory over the last week.
on 02024-08-13#video about #Sunamp phase-change thermal #energy-storage; apparently the Sunamp Thermino “thermal batteries” use sodium acetate as the phase-change material. This guy’s leaked 7 liters onto the floor, so Sunamp is replacing them under warranty with a new unit (model Sunamp UniQ eHW 12+ iPV, 14kWh of storage, 2800 watt continuous electrical load, contains 13.7ℓ of water, appliance tag in the video) which weighs 220kg. Supposedly it can charge the acetate at up to 3400W. He powers it off his #photovoltaic #solar panels on the roof, which generate 200 watts even on the “quite overcast” day he’s filming, though they look like several kilowatts peak. He also has electrical batteries for storage.
on 02024-08-13#video #toread from #JSK-koubou about 25 #woodworking #manufacturing hacks
on 02024-08-13#video about armor-piercing #weaponry, mostly HEAT, including the RPG-7, and countermeasures including wood planks, cardboard, metal cages, and explosive reactive armor, and other related topics, and counter-countermeasures such as tandem warheads, questioning whether #tanks have a future.
on 02024-08-13#video from two days ago about #Ukraine invading Russia #politics
on 02024-08-13#video compilation from the #Ukraine war from #Armapedia, in Spanish, mostly around Chasiv Yar from late last year. A group of journalists being ferried around the front. #politics
on 02024-08-13#video #toread about military ruggedized laptop #hardware
on 02024-08-13#video #toread although it’s by #Undecided about #solar #energy #energy-storage (“in this liquid” #clickbait)
on 02024-08-13#video of #Symbolics Genera by Kalman Reti. He explains that the objects that you print on the typescript have their characters linked to the original objects, so “presentation to command translators” can take the “presentations” of objects already printed in the typescript and “convert them into, you know, reasonable commands”, and things stop being “mouse sensitive” (sometimes just “sensitive”) when you’re “in the context of wanting” something they aren’t. That is, when the argument you’re currently providing to the command line is some other type of argument (in his example, an image (picture) rather than a command). He also demonstrates the “Peek utility program” which shows an auto-updating display of processes, filesystem connections, windows, or things like that, and invoking the debugger from a popup menu. He’s very excited about how Lisp Machine Lisp allows you to have 2-D subsets (by reference, sharing storage) of 2-D arrays, like Numpy slices, “displaced”.
on 02024-08-07#retrocomputing #history #video of #Symbolics #Lisp #3D #graphics. Probably from about 01987. Maybe a digitization of a 30' VHS tape made by Symbolics at the time with shitty elevator music. He’s interactively modeling of a little airplane.
To orient the 3-D axes, their negative sides are “marked with gaps”, and the Z-X plane is “marked with a triangle” (the Y axis being the normally vertical one, as in Minetest).
The original might have been higher resolution, because all the user interface text is illegible except in occasional zoom shots.
It takes about 4 frames at 30fps for each popup menu to fully draw, making the #UX a bit sluggish, and larger menus can take as long as 8 frames. Similarly, the little airplane model (with about 30 polygons) can only redraw about once every 4 frames, making interactive rotation clumsy.
Interesting choice called out at 6'28": the popup menu pops up with the mouse on top of the last choice, easing the task of repeating it. As IIRC is usual with Genera, the menus have black shadows, and the active menu item is highlighted by drawing a box around its text.
Object edges and points are highlighted by making them thicker; object faces are highlighted by filling them with black. Presumably at this point they didn’t have color.
It can import data from “Cattom [?], CATIA, and IGES formats”!
At 11'55” he’s enthusiastically explaining how Genera supports multitasking, as he demonstrates a somewhat Flash-like animation program called “S-Dynamics”.
At 14'44” he shows “a look at [the bird animation] on the color screen”, which implies that indeed the screen he's been looking at is monochrome.
At 18'28” he starts doing a UI demo on the color screen itself, which is even slower, probably because it uses 32-bit RGBA. There’s a sort of ribbon-like thing across the bottom with a hierarchical menu tree structure inside of it. Drawing a translucent gradient circle is demonstrated at 21'25” and takes over two seconds of computation!
At the end, he mentions being able to export to “any video format”: “PAL, NTSC, or HDTV”, and the first (satellite) HDTV broadcasts were in 01989, so this might have been at the very tail end of Symbolics, around 01990.
Oh, yes, at the very end it says it's “Copywrite [sic] 1989 Symbolics Inc.”.
on 02024-08-07#video of an hour and a half on robots that don’t look like humans: the everting “vine robot” from the lab of Elliot Hawkes at UCSB, his jumping robot that jumps 30 meters high, flexures, and an inflatable compliant truss octahedron robot. #Veritasium #formina
on 02024-08-07#video on #3D-printing silicone molds #toread
on 02024-08-04#video by that Japanese-Argentine YouTuber about what #Argentina is like. Excellent description.
on 02024-08-04#video about #3D-printing with "computed axial lithography", Taylor Waddle's doctoral research at Berkeley under Hayden Taylor (?) with Brett Kelly, using an off-the-shelf movie projector retrofitted to use 405nm LED light.
on 02024-08-04#clickbait #video #toread about #ceramics #air-conditioning #cooling #todelete
on 02024-08-04#video #toread about #3D-printing microscopic glass
on 02024-08-04#video #toread about radio-controlled machine-gun #weaponry in #Ukraine. Specifically, a remote-controlled machine-gun nest in a fortification in a bridge embankment — a machine-gun nest with no gunner, which withstood Russian attacks for 40 days, during which it was able to halt Russian advances anywhere within its line of sight. Battery-powered I guess. This was in Avdiivka. #politics
on 02024-08-03#video of double-distilling a truly terrifying amount of cesium, 139.13 grams, into an ampule.
on 02024-08-01#video on #manufacturing #titanium features on glass with #photolithography with 20μm resolution with vacuum coating by magnetron argon sputtering. He tried using a photographic enlarger in reverse without success. His setup is about 2 meters tall and made from 8020 aluminum extrusions, with a Minolta camera zoom lens (35–70mm, DSLR?) focusing onto the photoresist on his microscope slide, after a Fresnel-lens illumination stage similar to an overhead projector (and possibly actually taken from one), converging the light onto the camera lens. He’s using a 395nm LED behind two diffusers from LCD monitors for the light source, which make the light more homogeneous on the focal plane than just focusing from the LED. He’s using a transparency film intended for screen printing to get more opaque masks, laser-printable maybe, sandwiched between two sheets of glass to keep it flat. Previously he was using this blue dry film photoresist, but couldn’t get consistent results. He tried spin-coating Mungolux R1000 liquid photoresist. Finally he used a Merck MicroChemicals AZ LNR-003 positive photoresist designed for lift-off techniques, spending US$170 on a 100mℓ bottle. He 3-D printed his spin coater, built around a drone motor. Because the slide is transparent he can put a USB microscope behind it to focus the camera lens. The undeveloped photoresist is washed off with lye and the developed photoresist lifts off the titanium with acetone. His sponsor PCBWay manufactured the magnetron he designed for sputtering. His Minolta setup gives him 14× reduction, which is how he gets to 20μm.
on 02024-08-01#video on "quadrupolar" #3D-printing with four nozzles on radial arms over a polar bed, almost a meter in diameter. Still seems like it has a dead zone in the middle. He used mostly stepper motors and aluminum 8020 extrusions. He’s limited to making things that are fourfold symmetric by the Clipper firmware he’s using. #manufacturing
on 02024-08-01#Veritasium #video on expertise and expert performance (Tetlock, Buffett, Kahneman, etc.) Lots of filler: stock footage and talking heads.
on 02024-07-31#video by #Steve-Mould on water-powered timers that oscillate using trapped air, a somewhat more complex design than the geyser pump. Super confusing, I don’t understand it. #mechanisms
on 02024-07-31#video on the new #Hacksmith lightsaber, which burns propane preheated with heatpipes with liquid oxygen in order to fit 90 seconds of fuel and oxidizer into a handheld form factor. A chemical oxygen generator would be much more practical.
on 02024-07-31Mike Bell’s #video on #manufacturing the #Guinness winning #Peregreen-2 #flying #drones explains why they wanted inherent stability: so they wouldn’t have to waste differential thrust on stabilization. He explains the batteries were 48V, 12S, 1500mAh × 2, 160C (!!!). To smooth the transparent canopy they printed it from PVA (!!) and misted it with isopropanol for days. Apparently he designed the shape in Blender!
on 02024-07-31#video by #Nicholas-Rehm of dRehmFlight on #manufacturing a #flying ceiling fan nearly five meters in diameter out of insulation foam, Gorilla Glue, pine boards, and plywood, for the aerial combat part of Flite Fest in Ohio. Video sponsor PCBWay made the motor mounts by #sheet-cutting and bending 4mm aluminum plate. He’s using two 16000mAh 22.2-volt 15C battery packs to power its 15kW in 12 730KV Emax motors. He fried two Teensy microcontrollers because the power line to one of the four arms was hooked up backwards. Unsurprisingly it ran out of battery quickly; the battery packs were only rated for 10.7kW, and for under 4 minutes. He probably should have put some skin on his foam, because one of the blades broke lengthwise along a pine board after an impact, which would have been easy to prevent.
on 02024-07-31#video on Luke Bell and Mike Bell #manufacturing #Guinness winning fast #flying #drones called "Peregreen 2", in part by CNC-cutting frame parts out of a carbon-fiber-reinforced plastic sheet (#sheet-cutting). Because streamlining was a top concern, it’s sort of rocket-shaped, which they played with by printing a transparent tail and illuminating it from within. Their fake batteries caught on fire, their motor wires caught on fire, their motor wires desoldered themselves from the ESC, their ESCs caught on fire, their PID control loops went out of control and crashed the drone, their motors turned out to be anemic, rough skin produced excessive drag, etc. But finally they got it to go 133m/s average over 100 meters, 142m/s peak. They were using FPV flying with goggles.
on 02024-07-31#video on how 250g+ #flying #drones need to be registered in Germany and some other countries
on 02024-07-31#video #clickbait #Thought-Emporium making microdot messages of dickbutt. Mostly stock footage. He confuses microfiche with other forms of microfilm, but then hand-develops Ilford PANF ISO 50 film. Mentions Fujifilm panchromatic Minicopy HR II film, which is ISO 6, intended specifically for microfilm. What he wants to do is photographically print zoneplates and other diffraction gratings.
on 02024-07-24#video #toread about broadcasting #LoRa without a #radio
on 02024-07-24#video about #bootstrapping a spot-welder from a 1.5V battery? #clickbait He’s extracting the carbon rod from a carbon-zinc battery (“Rabbit” brand, which is maybe a Vietnamese thing?) and then uses like a 12-volt scooter battery or something? His bottle of 28% sulfuric acid is labeled in Vietnamese; he uses it to corrode some of the peeled-off battery casing, producing hydrogen bubbles, and perhaps to clean the carbon. He sands the surface of the carbon electrode, maybe to bring it to a point. He uses some leftover copper pipe as an electrode holder, piercing the electrode end of it with a drill for some reason, after “center-punching” it with a nail. Then he mounts the copper electrode holder in a bamboo handle. A little more drill action on the non-electrode end, drilling at an angle through the pipe end, and he can insert a wire, fold it over, twist it around, and hold it in place with the bamboo. He strips his wires with a box cutter, rolling the wire along the blade. He crimps on his large alligator clips with diagonal cutters. His power source for the spot welder is the 36V rechargeable battery from his cordless drill! A couple of pieces of steel wire stuck into its terminals can be connected to the alligator clips. The carbon can draw an arc from the other alligator clip. Before spot welding, he cleans the surface with the sulfuric on a Q-tip. He feeds some twisted steel (or solder?) wire into the arc in order to make the weld, blowing out the carbon when it catches on fire. The sulfuric seems to be his only flux, and he’s welding on stainless, so his penetration is terrible. This battery DC arc welding is very quiet, though, with just the hiss of an arc. After a few minutes of such welding, the battery seems to be dead. A rat-tail file cleans up some of the worst of the weld.
on 02024-07-24#video #toread about melting metals in the microwave.
on 02024-07-24#video about #Argentina setting up a new military base in Ushuaia together with #USA, possibly inspired by #Antarctica oil #energy; #Milei went to Antarctica as soon as he assumed the presidency to repudiate #Chile’s conflicting territorial claims, in the “territory of peace and science” in the treaty signed by all three countries. The Russian discovery might be twice Saudi Arabia’s oil. Reporting by Mega Investiga or Mega Noticias of Chile. #politics
on 02024-07-24#video of Nyquest 1.8¢ #microcontrollers with schematics for a vibrator and a hair curler. They demonstrate some EMI and ESD testing, using a cigarette lighter insead of an ESD gun for the ESD testing!
on 02024-07-17marketing #video on #battery testing #electronics #hardware for battery manufacturers and electic vehicle manufacturers
on 02024-07-11another #music reaction #video, this time to the Disturbed cover of “The Sound of Silence”, with a panel of tribal people in Sindh.
on 02024-07-10another very happy reaction #video to Bohemian Rhapsody #music, this time in AAVE. This is the first time I’ve heard someone use the phrase “no homo”.
on 02024-07-10#video of rapper Liite reacting to his first hearing of Queen #music, specifically Bohemian Rhapsody. It’s super adorable how he loves it
on 02024-07-10#video of slinging stones at a watermelon in an 18-gauge steel helmet, 200 joules with a 28-inch sling
on 02024-07-10#video on #manufacturing borosilicate glass #materials in a microwave. His glass ate his insulating firebrick, but he was able to get it to work by using a ceramic crucible as a firebrick liner.
on 02024-07-10#Shake-the-Future #video of #3D-printing a split casting box, with alignment pins, with the pre-split casting form halves already in it, allows you to pour investment casting plaster (dental casting plaster without sand) onto the print bed, then withdraw the form from the plaster once it sets up. Sprues can be hollow, and I guess the form can too. He’s using PLA, which in this case you don’t actually want to spontaneously delaminate from the bed when it cools. And he’s running G-code on the printer (a Prusa MK4) to shake out the bubbles from the plaster! This also avoids the need for alignment pins in the form (just the box) and the need for parting dust. I bet you could do this with sand casting too! To help with withdrawing the form from the mold, he microwaves it in a plastic bag, which even permits undercuts, like lost-PLA casting. No plastic is left in the mold when you turn the furnace on. He uses his airfryer to dry the mold for two hours, then his oven for three more hours at 250°. And then he uses a microwave kiln to melt brass! He says it can even melt stainless! His alignment-pin holes were sized for M8 bolts, which also hold the mold shut. He uses a Noga deburring tool to remove the mold flash. He calls this technique “print-wave casting” because he uses the microwave. #manufacturing
on 02024-07-10#video on 3-D scanning of #cuneiform tablets with a 75μm-resolution X-ray CT scanner, then #3D-printing replicas
on 02024-07-10#video of STBN TʕOORNR #writing his name in Ugaritic #cuneiform with a #tutorial on the different strokes
on 02024-07-10#video about #bootstrapping silicone #materials from 40mℓ of sodium silicate (modulus and concentration unspecified but it looks syrupy) and 10mℓ of 95% ethanol, which he claims ethylates the silicate chains. Then he squeezes the water out of it. The resulting silicone is super bouncy, much more rigid than polydimethylsiloxane. Very impressive. By #Apoptosis.
on 02024-07-10#video of #Dalibor Farný describing how his Nixie tube factory almost went out of business a couple of years ago. Mostly talking-head footage but some good stuff too.
on 02024-07-09#video of Terry Jones’s “The Story of 1”, covering the Ishango Bone, Sumerian accounting clay tokens, the Egyptian cubit, Pythagoras, etc.
on 02024-07-09#video of dragging a Durden desktop environment from a desktop computer onto a cellphone while a game was still running
on 02024-07-08#Thunderf00t #video attacking mostly #elmu, though oddly enough mostly for #SpaceX
on 02024-07-07#Thunderf00t #video attacking "TwobitDaVinci" but mostly describing how evaporation of water #materials works
on 02024-07-07#CodysLab #video #manufacturing a cast-iron skillet with thermite #materials
on 02024-07-07#video about a FAB-3000 bombing in Kharkiv, #Ukraine. Seems like the FAB-3000’s error is on the order of ten meters. It’s 3 tonnes (payload 1.4 tonnes TNT) and they tout a 25 “mile” range. Says the Su-34 can accommodate one FAB-3000 or three FAB-1500s. Cites the pro-Russian Telegram channel Fighterbomber. The UMPK (Universal Modular Planning Kit) is a bolt-on guided glider which supposedly gives it a 50 “mile” range as a so-called “glide bomb”. #weaponry #politics
on 02024-07-07#video on Voronezh ammunition #weaponry depot blowing up near #Ukraine #politics
on 02024-07-07#video #toread on electric thermal rockets such as resistojets
on 02024-07-07#video on US #weaponry failing to hit in #Ukraine (JDAMs and SDBs) #toread #politics
on 02024-07-07#video from Terra from today of #Ukraine fighting. #toread #politics
on 02024-07-07#DarkFootage #video of US #weaponry in #Ukraine, specifically a NaviStar M1224 MaxxPro. The video sounds like a NaviStar Defense ad. Mostly it consists of a single 5-second piece of drone footage repeated over and over again. #politics
on 02024-07-07#video of #Ukraine fighting from six days ago; supposedly the Russians lost 1110 troops, 115 vehicles, and 66 artillery pieces that day. Currently 500k Russians are there, almost as many as have died there so far, and another 200k to 300k are about to be sent. #politics
on 02024-07-07#video of a T90M being defeated by a pair of Bradley IFVs before getting blown up by a drone, along with some reflections on the nature of battlefield power. Not a very credible source. #weaponry #Ukraine #politics
on 02024-07-07#video of voiceovers over repeating stock footage from anti-Russia propaganda channel "Military Show" about #Ukraine, not worth finishing watching #politics
on 02024-07-07human-interest #documentary #video by Björn Platz on energetics in old-highrise demolition, mining, #materials science, film special effects, airbags, etc., including the history with Ascanio Sobrero. Significant factual errors, including Sobrero’s first name, the health effects of nitrate, and the physical state of liners turned into jets. Shows the use of burning pollen in film special effects, which is totally hilarious, and the use of 3-D modeling software in granite quarrying, and nanodiamonds and nanosupercrystals (of carborundum?).
on 02024-07-06old #video #documentary on #Nitinol #materials showing heat engine #mechanisms at the Lawrence Berkeley Laboratory, by Ridgeway Banks, assisted by Professor McMillan. The video credits Stewart Brand for first drawing attention to it in CoEvolution Quarterly. Looks like about 01975. They were hoping they could convert waste heat into a solution to the energy crisis.
on 02024-07-06#video #documentary about the French Foreign Legion by Taylor Cavanaugh, a former Navy SEAL who went there after prison and just got out after five years. 92 minutes. #toread
on 02024-07-06#TPAI #video #toread about #manufacturing his #CNC plasma cutter
on 02024-07-06#TPAI #video #manufacturing a #CNC milling machine from mostly scrap metal. He’s using the crankshaft timing pulley from a VW Golf 2 1.8 8V engine to couple his head-sized NEMA 34 junkyard stepper motors to his junkyard Acme leadscrews for the Y-axis, because the pulleys cost US$5. The pulleys have a size-L toothed belt with a 14.5mm bore and four M8 threads around the outside, one offset by 5°. He drills the pulleys out larger to fit onto the leadscrew shafts, then makes an aluminum driving adapter to bolt the pulleys to so he can couple them to the shaft. For coupling the other pulleys to the 14mm stepper shafts, he also drilled them out bigger, then made a brass tube adaptor to which the pulleys are held with three setscrews. For his X axis he’s using a junkyard ballscrew. He mentions that ATX power supply #electronics have their -12V rail connected to their enclosures and to the ground wire, which I didn’t think was correct, but anyway he removed that connection in order to be able to use four of them in series to get 48V. For sheet metal bending without a brake, he clamped his sheet metal to the edge of a table and whaled on it with a 4×4 board. He demonstrates the use of his existing homemade CNC plasma cutter. Finally he mounts a 2000-watt wood router onto the large gantry he’s built and uses it to route some beech butcher block and some aluminum plate, and even 4mm-deep grooves in steel (using a tungsten carbide bit). He mentions the need to minimize the number of piercing operations for CNC plasma cutting because of how they wear out the nozzle quickly, a consideration I hadn’t realized.
on 02024-07-06#Hossenfelder #video on #politics in #Germany resulting in infrastructural decay and trains not running on time
on 02024-07-06another #video that doesn’t really explain #entropy, this one by #Hossenfelder, though it does at least explain S = k ln Ω
on 02024-07-06#Veritasium #video about #entropy in #physics, explaining Carnot efficiency and thus the rudiments of #thermodynamics, but not explaining even the units of entropy; he chose to include stock footage clips instead of equations. But he does include a bargraph of how much entropy was in the early universe and how much is in stars, neutrinos, empty space, the CMB, and the Milky Way’s central black hole, so it’s still pretty informative.
on 02024-07-06time-wasting talking-head and stock-footage #video on #graphene #materials, using tennis courts as its standard measure of area, with the occasional second or two of actually informative footage
on 02024-07-06#video by #NileRed explaining the Tollens silvering process. His Tollens reagent recipe is 17g silver nitrate (homemade), 2.4g soda lye, and 9mℓ concentrated ammonia: 1ℓ 0.1M AgNO₃, gravity filtration through three or four coffee filters, measure off 150mℓ, add 9mℓ ammonia solution, which with stirring soon complexes away the precipitated silver oxide into the desired diamminesilver complex; then dumps in the 2.4g of lye, and on stirring again the silver oxide precipitated dissolves. Warns of the danger of degradation to silver nitride if not used immediately, which gave some brown discoloration after a few minutes. For the mirror demonstration he shakes this at room temperature for several minutes with 1g dextrose, suggesting that a hot water bath would accelerate it. #materials #bootstrapping
on 02024-07-02#video #toread about balls bouncing with backspin from #Mould
on 02024-07-02#video about #Argentina president #Milei calling Inácio Lula Da Silva, president of #Brazil, “The perfect dinosaur idiot”, “corrupt”, and “Communist”. Pure talking-head filler, with a voiceover reading tweets.
on 02024-07-02#video from #Ukraine from three days ago, killing Russian troops with #flying #weaponry. Another “Terra” fundraiser video. This time they’re flying the drones from inside some kind of wooden structure rather than a basement, where they have a butane canister camping stove set up. I think they’re in a trench. Drones with arms made of carbon-fiber tubes again. They’re attacking a similar command-and-control center on the Russian side, in a house with its windows barricaded with sandbags. The first drone, a quadcopter, blows most of the roof off; the second one, a hexcopter, carries a heavier charge, a thermobaric warhead which looks like it weighs close to 5 kg and has tailfins for dropping from a plane. It sets fire to the building. The next drone seems to be carrying an RPG without a fragmentation belt, which they use to attack an IFV (so maybe the armor-piercing HEAT is indeed in play here). They claim the explosion killed all the passengers. The next drone, attacking a squad of three infantrymen on foot, failed to explode on impact, but did explode shortly afterwards, probably killing all three of them with shrapnel. The next drone attacks a lone infantryman, who futilely tries to shoot it down with a rifle. Then they kill another infantryman who was walking slowly because he was wounded. Then they launch another large hexcopter carrying a 3-kg charge to attack a trench; the infantry hear it and flee into the dugout, to no avail. Then there’s another hexcopter with the repurposed thermobaric bomb, which explodes in a trench. They’re apparently driving around Ukraine on the highways in an unarmored van with the door open. #politics
on 02024-07-02#Technology-Connections #video on 01970 "Numitron" display devices from RCA: seven-segment #displays made of red-hot incandescent filaments in vacuum tubes, basically seven-segment 5-volt lightbulbs, 25mA per filament. He also shows IV-11 VFD tubes, a seven-segment clock he made in college out of LED tape, and a clock he made out of Numitrons, driving them directly from BCD decoder chips without separate driver chips. He catalogs the design errors in the Numitron: the digits don’t lean and so the decimal point makes them off-center; the segments are too thin to be legible; the segments are too far apart (they could have actually crossed in different planes); the vertical segments extend too far; the opaque support board behind the filaments is grey rather than black, reducing contrast and blurring the segments; and the numbers are slightly crooked due to imprecise assembly of the tubes. The Russian clones are even worse.
on 02024-07-02#Mythbusters #video failing to cut slaughtered pigs in half by cutting a taut cable and letting it snap. #physics #safety Also an #archaeoacoustics test with a pottery wheel.
on 02024-06-28#Kaspersky, just banned from the #USA, supposedly discovered something about WannaCry, which used #NSA’s EternalBlue, leaked by TheShadowBrokers, just a month after the leak. Several minutes of details about EternalBlue, followed by a Brilliant ad. Never explained anything about Kaspersky, worthless #clickbait. #security #video
on 02024-06-28#video on #Bolivia coup attempt which apparently failed. #politics
on 02024-06-26#scouting #camping stoves: after trying canister butane stoves, white gas stoves, etc., the one he likes best is two chunks of unglazed porous pizza-stone-like ceramic soaked in alcohol. Basically a rock. #video
on 02024-06-26drone #video of breaking up a bunch of limestone bedrock with explosives, from a lot of different angles, to dig a pond and get materials to pave the road and build a house.
on 02024-06-26pro-Russian source #Military-Summary describing the current #Ukraine warfront with a map of incidents; e.g., the Ukrainians lost a whole convoy in the forest near Synkivka according to night-vision video, the Russians captured an Abrams tank in Berdychi, etc. #video
on 02024-06-26#video footage from the fascist Azov Brigade of trench warfare in the defoliated pine forest Serebryansky Pine Forest in #Ukraine. Evacuation of wounded soldier (left leg and pneumothorax) on a stretcher to an IFV. A puzzling thing is that there don’t seem to be any anti-personnel mines, though plenty of anti-tank mines.
on 02024-06-26#video footage of a captured turtle tank in #Ukraine which had no ammunition and no explosives in its reactive armor. Then footage from a trench battle.
on 02024-06-26#video on FAB-3000 M-54 glide bomb with UMPC (unified planning and correction(?)) guidance system, which struck 10 meters from its target in #Ukraine today. #weaponry
on 02024-06-26#video reducing boria powder to metallic boron with magnesium powder, igniting the mix with a butane hand torch after magnesium ribbon failed. Seems to be Polish. I feel like he didn’t do a good enough job of neutralizing the magnesia and probably had a bunch in his final product. That still doesn’t quite explain the 316% yield. #materials #bootstrapping
on 02024-06-26decoy #weaponry being built in #Ukraine #video with lots of talking heads and stock footage from #DeutscheWelte
on 02024-06-26#video on a manganese-dioxide/zinc 2.5-volt dual-electrolyte battery with KOH on the zinc separated from H₂SO₄ on the manganese dioxide by a chip of terra cotta clay. Actually it isn’t real terra cotta; it’s some kind of air-hardening modeling compound (“Das”, from Italy’s Fila Group). But apparently it’s porous. He gets 14–15mA out of his postage-stamp-sized battery with a chunk of graphite as the cathode current collector, despite the membrane being almost 2mm thick.
on 02024-06-26#video on unsuccessfully attempting to oxidize SO₂ #materials with #electrolysis instead of catalysts or H₂O₂, using a platinum anode and a copper cathode. His electrolyte is dilute H₂SO₄. The hydrogen and oxygen being generated in a closed flask seems like a baad idea to me. His electrolyte turns orange, maybe because of reducing back to sulfur on the cathode. Oops, he got backflow from suckback and lost all his product. In a second run he got copper sulfide on his cathode and sulfur in the solution, which fortunately defecated. In two hours he did get the H₂SO₄ concentration up from 4% to 4.2% in his 100mℓ batch. Then he did a control test without the electrolysis and it went up to 6%.
on 02024-06-26#video on #Ukraine’s naval drone #weaponry, including the Marichka, a torpedo with a range of 1000 km and the ability to go dormant. Gets to the Sergey Kotov at about 15'30" and then the Tsezar Kunikov and the corvette Ivanovets, which apparently they also sank. The time-wasting talking head describes it as a “garage industry” — it’s decentralized to prevent Russian targeting of the production facilities. And apparently there’s an “Unmanned Systems Force” as a new branch of the Ukrainian armed forces.
on 02024-06-26as of a month ago, in #Ukraine, Russia had had 1800 tanks destroyed, 530 captured, and 270 abandoned. They’re starting to deploy T-55s and T-54s and US$4.5M T-90Ms (about the same cost as an M1 Abrams tank), but not T-14s. Another annoying #weaponry #video made of talking heads and stock footage. Russia’s new budget spends 6% of GDP on the military
on 02024-06-26The Sun (garbage #UK tabloid) claims NATO tank #weaponry is too heavy for #Ukraine’s bridges or indeed those in most of Eastern Europe, which have a 60-tonne limit, and with active protection systems too heavy for even the ground. Lots of talking head footage and even repeating stock footage, so kind of a trash #video
on 02024-06-26#NurdRage #video on #bootstrapping H₂SO₄ by blowing SO₂ onto a CuCl₂ solution, which oxidizes it the same way it oxidizes PCB copper, precipitating CuCl and also producing HCl as a waste product. Then you can reoxidize the CuCl with air before switching back to SO₂. He also mentions he made a previous video using H₂O₂ to do the oxidation. #materials #scouting
on 02024-06-26another #video on #bootstrapping H₂SO₄ with oxalate and blue vitriol. #materials #scouting Deleted “for violating YouTube’s Community Guidelines”. #censorship
on 02024-06-26#bootstrapping H₂SO₄, which is apparently illegal in the #EU, but starting from the dilute stuff. #materials #video #politics #tutorial
on 02024-06-26#manufacturing a sort of surface gauge for woodworking for marking horizontal lines on things. #video
on 02024-06-26#sewing #tutorial #video #toread without a sewing machine. #toread #scouting
on 02024-06-26#video of Iran’s #Shahed 136 kamikaze drone servomotor. It uses an #STM32 with six power MOSFETs to control a brushless motor and read from an encoder; these motors sell for €20 in Ukraine. There’s a silicone conformal coating to protect the board. It uses a conventional 600μs–2.4ms PWM control signal. Interesting reverse-polarity protection circuit on the ground rail. Detailed schematic analysis, awesome. #electronics #hardware #microcontrollers #flying #weaponry #Le-labo-de-Michel
on 02024-06-26#video about #manufacturing #aluminum-air #batteries with either KOH or NaCl electrolytes. #energy #electrolysis Unfortunately “members only”.
on 02024-06-25#video about #manufacturing #aluminum-air #batteries with dual electrolytes: potassium hydroxide and 50% H₂SO₄, separated by a membrane, to get a higher voltage, over 2 volts. Uses “activated carbon felt” (??) for the air electrode. With a single electrolyte he gets 1.56V. He suggests bleach as an alternative alkaline electrolyte and vinegar as an alternative acid. He uses paper towels to hold the electrolytes in place. For “some short testing” he uses baking paper as the membrane, but of course it won’t last long in that environment! He suggests Nafion as the only viable membrane option. His postage-stamp-sized test cell gets 2.2 volts and can light an LED. He adds MnO₂ to his graphite electrode as, I think, a depolarizer, boosting the cell to 2.5V. (Maybe it’s an actual electrolyte material, though?). For whatever reason he never measures its short-circuit current, except for showing that the LED lights and doesn’t immediately burn out, so the battery presumably has on the order of 100Ω of equivalent resistance. Finally he builds a version of the battery with a salt bridge instead of a membrane, but using zinc rather than aluminum. Surprisingly the salt-bridge version is also able to light the LED, despite presumably having much higher ESR. #energy #electrolysis
on 02024-06-25#video about FPV drone #weaponry in #Ukraine, describing the tradeoffs of things like analog vs. digital video. Lots more #3D-printing on view here.
on 02024-06-25another #Godot 4 multiplayer #tutorial #video #toread not by BatteryAcidDev
on 02024-06-25#Godot 4 multiplayer #tutorial #video #toread not by BatteryAcidDev
on 02024-06-25#AvE #video about vises #toread
on 02024-06-25#AvE #video about Samsung flip phones but mostly about Gorilla #glass. Mostly just a bunch of handwaving. But then he does a teardown of a flexible plastic OLED screen that folds in half, so it’s all good.
on 02024-06-25#video about #3D-printing a whole #flying drone, “even the motors”, using 3 kg of filament, but evidently they’re wound with regular copper wire and using steel cartridge ball bearings and steel nuts and bolts and, originally, a steel 8mm shaft and collar, which he replaced with (brass?) heat-stake inserts and a precision-ground steel shoulder bolt. The motor’s magnetic core is, however, 3D-printed using “magnetic PLA”. He’s also using (rare-earth?) permanent magnets. The dovetailed arms (evidently designed using #topology-optimization, and vastly overspecced) are held on with a very interesting plastic twistlock design. He measures the thrust as ≈3kg of weight (≈30N) using a US$8 load cell from Amazon, but the motor took 2½ seconds to spin up to full thrust rather than the 800ms for a much smaller comparable-thrust off-the shelf all-metal type. By #Michael-Rechtin. #mechanical #manufacturing
on 02024-06-25#video on #3D-printing a #flying radio-controlled model Orca tricopter (three ducted fans) from Command & Conquer with #topology-optimization and nylon powder “multijet fusion” which sounds like it doesn’t involve any jets at all. No notes on the electronics or software.
on 02024-06-25#video #toread on the cheapest MIG welder in the world. #mechanical #manufacturing
on 02024-06-25#Myanmar #video #toread on the rebellion
on 02024-06-25in April 02022 #DJI quit Russia and #Ukraine over the widespread use of the Mavic as improvised #flying #weaponry. Supposedly also Starlink was crucial to streaming FPV footage from drone crews to artillery crews until March 02023, at which point they blocked their service in Russian-occupied territory, over water, and at speeds over 100km/hour, claiming that the purpose of providing Starlink was humanitarian, not military. #video
on 02024-06-25#video #toread where #USA drone operator describes his experience #flying #weaponry, specifically the Puma drone
on 02024-06-25#video #toread by #Tony-Soares about the “urban Anasazi” #ceramics firing technique
on 02024-06-25#video of disassembling a BM-23 Russian tungsten-core fin-stabilized APDS tank cartridge from 01985, showing 8.5kg of nitrocellulose propellant extruded in the form of thin tubes, packed into the cartridge. Demonstrates how it burns when ignited with a cigarette lighter, and shows the wax-paper phlegmatizing liner. Knocks apart the sabot with an axe. The sabot is small and toward the front of the dart, relying on copper buttons around the tailfins to center the tail in the barrel, while many other APDS designs use a longer sabot. #weaponry
on 02024-06-25#video of #Ukraine bomb-dropping #flying #weaponry killing Russian soldiers. Fundraising video for “Terra”. In Ukrainian with English subtitles.
on 02024-06-25#video from two weeks ago of #Ukraine kamikaze FPV #flying #weaponry killing Russian soldiers. Fundraising video for “Terra”. The first drone they fly is a hexcopter, maybe a surveillance drone; the first kamikaze they show taking off with a metal cylinder zip-tied to its bottom is a quadcopter whose arms seem to be round tubes, maybe GFRP. It's using three-bladed propellers and has a fairly oversized battery pack on top. The Russian targets, which they refer to as “cockroaches” (like in Rwanda!), are holding a previously Ukrainian trench; the first drone blows up in the trench, though the actual death is censored on YouTube. The squad is operating the drones from a concrete-roofed brick basement close to the front lines. The second and third drones are used to disable what looks like a turtle-tank-armored IFV, and the fourth kills a Russian soldier in the trench who is attempting to shoot it down with what looks like a shotgun. The fifth kamikaze drone launches carrying what looks like an RPG, which is zip-tied to it and thus unable to fly on its own; not sure if it has a shrapnel belt. It’s pointed horizontally, so it wouldn’t be useful for HEAT; instead they detonate it over the head of a fleeing Russian infantryman, killing him. A sixth kills another fleeing infantryman with a fragmentation charge, and a seventh is launched carrying another RPG to pursue the last infantryman, but opportunistically attacks a “Bukhanka” vehicle poorly hidden inside a hangar instead. An eighth is used to set fire to the building some other troops fled into. Because some other troops fled into a hangar, they launch a heavier hexcopter kamikaze drone with a larger charge (4 kg of PVV-7, later described as 3 kg), whose arms are carbon-fiber-reinforced tubes.
on 02024-06-25#video #toread about #3D-printing #mechanical parts with 25% glass filled filament
on 02024-06-25#video #toread on #Ukraine #weaponry
on 02024-06-25#video by #Segerman about a maze (“dodecahedral holonomy”) where the “rook” you move around has arms sticking out so that which edges it can traverse depends on its state of rotation, which varies when it travels a closed circuit, providing a 120-vertex graph. Generatively designed with Grasshopper after his Python code spent several hours designing the maze.
on 02024-06-25#video #toread about #bootstrapping woodworking tools
on 02024-06-25#video of an Irish FPV pilot from South Side Dublin, nicknamed “Irishman”, with Ukrainian parents, in the “Terra” FPV unit of the third “storm brigade”, #flying drones into Russian D-30 (122mm howitzer, perhaps US$3 million) and D-20 #weaponry in #Ukraine from what seems to be a stone vaulted basement; they said they knew the first one wasn’t a decoy from observing artillery fire the day before, though later they identified a decoy from the FPV video. They destroy a whole artillery unit (six artillery pieces, or maybe four, or two, it varies). He came in through the Internatsionali Ligion (my transcription). Mostly interviews with the four soldiers in the unit. A Russian FPV drone finds the bunker where they’re piloting from but doesn’t find them. They’re uploading the videos to raise money for more drones on social media.
on 02024-06-25#video on a zip gun, improvised #weaponry used in the 01950s made out of plumbing fittings. Supposedly legal in the #USA.
on 02024-06-25#video of Russian soldiers on a speedboat on the Dnieper shooting down a #Ukraine FPV drone #flying after them, maybe with a rifle. A second drone covers the boat with shrapnel from an air blast, killing four of the seven soldiers; the other two, unable to control the boat, jump into the water as a third drone arrives, killing them as well. A seventh remains unaccounted for. A fourth FPV drone blows up the boat. #weaponry
on 02024-06-25#video from #Ukraine of an FPV pilot repeatedly buzzing a squad of soldiers #flying #weaponry
on 02024-06-25#video on an approaching #EU ban on pure basic #materials; he’s diluting them to keep them legal
on 02024-06-25#video on Chinese type 69 RPG #weaponry in #Ukraine
on 02024-06-25#video of ground-based #Slaughterbots in #Ukraine (D-21-11) looks like a slow-moving four-wheeler ATV. The presenter calls it “their drone” and a “UGV”. Ukrainian design. Allen bolts, lots of laser-cut (?) steel plate. The machine gun is mounted on shock absorbers (something like McPherson struts, with springs around what looks like a ground steel piston, but I think it’s actually just sliding through greased bushings). The cut metal plates, which have weight-reduction cutouts, are bent and intermittently welded onto structural steel tubing to form the frame. No visible ribs, so they probably aren’t pressed, just cut and bent in a brake. Lots and lots and lots of screws, probably optimized for field hackability and repairs. There’s a ripcord, but not for pull-starting the engine. About the size of a riding lawnmower or golf cart, and about as fast in what they show here. It can carry about 4–6 people when the machine gun isn’t mounted, or one person in a lying-down position, tied down with bungee cords to built-in D-ring tiedown spots. It’s electric with 15km of battery; the battery does have ribs. Two or three cameras on both the front and the back surrounded by near-infrared LEDs. Two 1.5-meter-long things at the back that seem to be large whip antennas. Turns in place like a tank rather than by turning the wheels; there seems to be a chain drive to each wheel, protected by a metal chain guard. It seems you can drive it from a laptop with a game controller or from a purpose-built FPV remote controller.
on 02024-06-25#video of a beautiful FPV drone flight in a park
on 02024-06-25#video of #Godot smooth scene transitions #toread
on 02024-06-25#video of #Ukraine Azov Brigade footage about how they captured a Russian trench fortification in the middle of a forest near the Donetsk/Luhansk border
on 02024-06-25#video on “impedance reflection” in transistors, a technique for easily calculating input and output impedance. But it comes down to just multiplying your emitter resistor by β, or dividing the impedance seen by the base by β to get the impedance seen at the emitter if that’s what you want. He does eventually explain why. Very slow-paced lecture by #AaronDanner, but informative. #electronics
on 02024-06-25#video #toread of #flying over a landfill in an ultralight paramotor
on 02024-06-25#video on #Godot multiplayer that’s not by BatteryAcidDev. #toread
on 02024-06-25#BrandonMitchell #video footage from Donbas of #Ukraine FPV drone pilots #flying a small ducted-fan quadcopter in the house, then showing off a larger non-kamikaze quadcopter US$700 “Lucky Strikes” drone which apparently drops NATO and Polish grenades. Then they show multiple workshops and weapons including with improvised contact fuzes and tailfins (made by #3D-printing in some cases) installed on these grenades. The famous fragmentation sleeves on RPGs are also shown. They even seem to have a HEAT anti-tank warhead rigged up with 3-D printed tailfins to drop from quadcopters onto tanks. “FPVs are very effective against [sic] destroying armor. (...) NATO munitions are difficult to convert. So many safety mechanisms.” Footage of drone making. #3D-printing around the clock. Also shows FPV-driven remote-controlled cars for laying mines, with wheels and wheelbase similar to a four-wheeled push lawnmower. The radio signals still seem to be direct rather than relayed. Mentions a friend of his who nearly got killed three times because she didn’t know she needed to “anonymize” her Mavic drone (apparently something you have to do in these workshops). Lots of discussion of logistics, timescales, repair pipelines, parts shortages. He says, “We're losing the war. It's not lost, it’s far from lost, (...)”. Lots of discussion of how to raise funds on social media for the war. #weaponry
on 02024-06-25#NurdRage #video on #bootstrapping H₂SO₄ from oxalic acid (dihydrate) and ferrous sulfate (heptahydrate), and the sun, with 46–67% yield. It’s very surprising to me that this precipitates iron oxalate. He boiled down the resulting acid until the remaining sulfate started to crystallize, then distilled it to 70% of nice, colorless acid. Using more oxalic acid he got 57% yield, and by leaving the defecation beaker in the sun for eight hours to reduce ferric ions, releasing CO₂, boosting the yield to 67%. An attempt with MgSO₄ only gave 2% yield. An attempt with blue vitriol generated a precipitate too fine to filter (maybe because he added the oxalic acid too fast). He says it even works for HNO₃. #materials #scouting
on 02024-06-25#video about #bootstrapping H₂SO₄ from alabaster #materials #scouting labeled as “satire”. He’s going using washing soda for this, which initially made me think it actually was satire, but thinking about it more, it sort of makes sense: calcite is far less water-soluble than alabaster (and he gets something like 50% yield on the calcite, proving it’s calcite with vinegar). But then don’t we just get sodium sulfate (already very useful for #energy-storage phase-change materials, but not the objective)? A water-soluble sulfate is progress, I guess. He converted most of his bicarb into washing soda first, but that seems like an unnecessary step, just convenient to reduce foaming. Then he electrolyzes it at 13.12 volts and 220mA in a hot-glued-together two-chamber cell with some kind of membrane or salt bridge in the middle, using a postage-stamp-sized iron anode (!!) in the chamber of initially almost pure water and a copper chain for the cathode. His objective with the iron anode is to precipitate out the remaining carbonate. Because the current is going up, he infers that soluble iron sulfate is being formed, although sodium sulfate leaking through his salt bridge (?) would be an alternative explanation. After five hours there was a lot of green/black sludge in the anode chamber; from the greenness he infers that the iron has precipitated all the carbonate. Then he runs it through a second electrolysis using a graphite anode, which nevertheless dissolved (I feel that lead would be a better ghetto choice) and electroplated his copper with iron, which is surprising given the presumably low pH. Then he puts it under UV light in a tiny aluminum-foil chamber, which he says is to ensure no remaining SO₃ molecules. No pH or specific gravity measurement.
on 02024-06-25#video about #flying the amateur rocket “DIAMOND-X” with waypoints. Arduino, it looks like, with an SD card and an RS422 bus onboard, and servoed tailfins. But his “waypoints” are up in the air near the launch site, not far away on the ground. Largely made with #3D-printing; he regrets having made the parachute connection with carbon-fiber-filled PLA instead of nylon. No code shared, sadly.
on 02024-06-25#video from November on diy #drones and #weaponry in #Ukraine, in the drone labs. Largely talking-head footage though. Claims that they gave Ukraine an “edge” that “leveled the playing field”. Mentions friends of soldiers in Ukraine organizing fundraisers on Instagram. Mentions that they’re using “signal booster drones” to counter jamming, and an SBIR for “a lethal payload capability that can be deployed on a small unmanned aerial system (sUAS)”. A pretty reasonable #introduction if you don’t know anything.
on 02024-06-25another #video about attempting #bootstrapping H₂SO₄ from sulfur #materials #scouting #toread
on 02024-06-25#video #toread about an #energy-storage “revolution” seems unpromising due to a CSP #solar thumbnail image. #energy
on 02024-06-25a #video about anti-drone #weaponry being supplied to #Ukraine, the Australian "Slinger" system by “Electro Optic Systems”, which turns out to be a truck-mounted single-barrel machine gun with automatic targeting via image processing, using “the tracking (...) the stabilization algorithms we’ve used to develop for deep space tracking”. Ten were to be delivered by the end of 02023. #Pricing “less than under one million US dollars”. #Australia #politics
on 02024-06-25another #video #toread on #PPDS #Slaughterbots #weaponry in #Ukraine #flying
on 02024-06-25#video from 9 months ago on flat-pack waxed cardboard drone #weaponry in #Ukraine “destroying Russian jets”; the airfoils and the rest of the bodies are assembled with rubber bands and tape and can be repaired with a hot glue gun, cardboard, and tape. Looks like there are some wooden rails (dowels?) for mounting the airfoils. Mainly powered by a single #brushless motor and propeller. Brands printed on the body are “Tanglewood Group Ltd.”, “SYPAQ Australia” (who exhibited it at a military trade show this year), and “CORVO precision payload delivery system” ("PPDS"). There’s what look like laser-cut balsa or other hardwood spars in the kit, at least in some cases plywood. SYPAQ’s Michael Partridge is quoted as saying a laptop allows you to “mission plan and launch” it, so presumably it’s not FPV, though FPV seems to be the main approach used these days. “About a shoebox size [unassembled], can carry roughly three kilos. (...) we've delivered over 600 of the PPDS into Ukraine.” Has been supplying “100 of these every month since March”. Mentions a strike at an airbase at Kursk destroying “five fighter jets, a missile launcher, and an air defense system,” then another attack on a Russian site a few days later destroying two cargo planes, also probably with these cardboard drones. #Pricing quoted at AU$5000 per drone. #Slaughterbots #flying
on 02024-06-25#video #toread on #3D-printing “viral” tools “so you don’t have to” #manufacturing
on 02024-06-25#video on #3D-printing for #manufacturing #electronics #hardware with the Micronics SLS nylon printer #toread #Krasnow
on 02024-06-25"Functional Print Friday" #video channel on #3D-printing functional parts
on 02024-06-25#ScrapScience #video on #bootstrapping HNO₃ #materials from KNO₃ using a terracotta flowerpot as an #electrolysis membrane with the drainage hole plugged with silicone, incorrectly described as a “semipermeable membrane”, in an HDPE container made from cutting the bottom off a plastic milk bottle. Copper cathode made from thick wire, graphite anode made from some round graphite bars. 100g KNO₃, unknown quantity of water (maybe 500mℓ), some distilled water added to the anode chamber. Initially he gets 90mA at 7.5V (=80Ω), but pretty soon that rises to 630mA (≈12Ω), and he limited the current to 1.02A. No hydrogen is generated at the cathode, surprising him, but he says it’s because the nitrate ions are reduced to ammonium. After about a day the graphite anode has been completely eaten, which makes me think it wasn’t really graphite, but like carbon arc gouging electrodes or something. The cathode compartment ended up being very basic and smelling very strongly of ammonia, so he made ammonia too. He says his crude titration (not shown) tests the acid at 0.7 molar, which apparently isn’t enough to attack copper, so he boils it with some copper in it, eventually dissolving the copper after boiling it down 4×. While this method does seem to work, it seems a little bit like a method of making an engine starting with only a car — the cheapest way to get KNO₃ is by neutralizing HNO₃ with KOH. He also thinks it “isn’t good enough to be practical” because of how dilute the product is.
on 02024-06-25#CodysLab #video on #bootstrapping H₂SO₄ #materials with the chamber process. He gets 20mℓ. #scouting
on 02024-06-25#video on #Hizbullah drones spying on #Israel. (Note from later: this was before Israel’s attack with exploding pagers on September 17 and 18.)
on 02024-06-24#video on how to design #flexures for #3D-printing. Unfortunately it’s pretty much just the same Snijlab living hinges and BYU CMR #mechanical things everyone makes, though BubsBuilds designed a flexure fractal vise. Recommends using nylon for FDM because it’s less vulnerable to fatigue than PLA, or PETG if nylon is too hard to print. Also make sure your slicer doesn’t position layer seams in the flexure blades, or change the number of perimeters there. Also you can adjust flexibility by changing the number of perimeters, i.e., “wall loops”. He also points out that short blades are more demanding and that you should use fillets.
on 02024-06-24#CNC-Kitchen #video on injection molding with #3D-printing (SLA for molds, and abusing the FDM nozzle to inject PLA into it). The SLA resin is glass-fiber reinforced and quite stiff. At first he didn’t preheat it, but started trying that in order to get the plastic to fill the mold. He finally had success by using a faster-injecting hotend, that time without preheating the mold. To be able to demold a cast with some undercuts, he made it in thermoplastic urethane (TPU) instead of PLA, which worked much better
on 02024-06-24#video #toread on the best DIY method for #manufacturing printed circuit boards (PCBs) using UV-curing ink and solder mask. 3 hours. #electronics #hardware
on 02024-06-24#video by #PhotonicInduction about what happened to him. Something about #immigration #bureaucracy for his Indian wife; he was too busy working to save up £62500 to make YouTube videos.
on 02024-06-24#video #toread of #Milei interview by Radio Mitre today; he says things are “starting to work” #Argentina #politics
on 02024-06-24#video #toread of #PhotonicInduction 20kW lightbulb
on 02024-06-24#video #toread with complete build of masonry stove and stairway. #scouting
on 02024-06-24#video #toread about how to spawn nodes in #Godot #games to, like, shoot arrows or whatever
on 02024-06-24#video about an “atmosphere powered battery” (like the Atmos clock, I thought, but it looks like he’s just using vacuum as a constant-force spring). The only interesting part about this is installing rubber syringe gaskets and transparent plexiglas tubes on a chassis made by #3D-printing. He ended up having to sandwich the syringe gasket between 3-D printed parts (with screws I guess) to keep it from popping off. Okay, maybe using cut timing belts as cables for power transfer is cool too. But basically I think this is dumb. Then he has a kind of cringey plug for PCBWay’s CNC services. Unfortunately the desktop-sized “battery” has an energy capacity of only 628 joules at about 10 watts, with what he said was 73% efficiency. My math: 1 atmosphere times 500mm (est.) per cylinder times circlearea(half 36mm) gives 412 joules. So maybe his cylinders are a little taller than I thought but basically it’s what you’d expect. #mechanical #energy
on 02024-06-24#video about bladeless water turbine. Way too much talking head footage and too much stock footage. But the principle is clear: water speeds up when spiraling down a drain, and you can harness that rotation through drag. He claims it has lower LCoE than solar because you don’t need any storage. #energy
on 02024-06-24#video by #Retsetman about "pericyclic" #mechanical transmission, which looks like a strain-wave gear without the strain, instead nutating because the barrel-shaped gear can spin freely on a part of the shaft that’s ground (well, 3-D printed in this case) with its axis at a 4° angle to the shaft’s own axis of rotation. Four moving parts to get 409.5:1 reduction, or six to correct for vibration. It’s apparently too inefficient to be backdrivable at least in its plastic incarnation. The 409.5:1 version is differential: each rotation, the nutating gear rotates the output shaft one 8.37° step forward, while rotating backwards one 9.23° step with respect to the fixed gear, which I guess means they’re 43 and 39 teeth respectively. It seems to have a lot of backlash or something though. The video contains erroneous statements about spur #gears. With the gear profile he’s chosen (some kind of involute-like tooth profile, which may be responsible for the backlash), he gets a slip-clutch effect which he considers a defect but which is a great advantage in some situations.
on 02024-06-24#video #toread about data models in #Godot #games
on 02024-06-24#video on the PAM-2 submachine gun from #Argentina in 01957–62. #weaponry
on 02024-06-24#video #toread about five-stroke #mechanical engines
on 02024-06-24#video about #energy-storage in phase-change materials, especially for hot water heaters such as the Thermino from Scottish company Sunamp; they run rectangular coils of brass pipes through a rectangular tank of an unspecified phase-change material; one £1945 model delivers 2.8kW to 15ℓ/minute of water, a price that increases to £3245 when installation is included. They advertise it as a “heat battery”. And Phase Change Solutions sells an “ENRG blanket” with quilted aluminized unspecified polymer encapsulating an unspecified “BioPCM” which has been installed in 1000 commercial buildings; it looks like it’s about a centimeter thick but costs US$4.50 per “square foot”, which would be US$48/m² in modern units and probably on the order of US$5/kg, which is about 100× more expensive than the raw materials. QE Platinum is a competing company and product. Apparently the PCM energy storage market is already half a billion dollars a year. Unfortunately this video is entirely talking-head filler and stock footage. Shame on you, #Undecided. #energy
on 02024-06-24#video about the demise of the 60-meter-long La Serenísima blimp, which was shot several times with a .45 by someone in Fuerte Apache, and then several more times with a FAL rifle in Córdoba, but continued flying until destroyed by a storm in General Rodríguez near Rosario. 95% fake by "Real 3D". #Plonk #Argentina
on 02024-06-24#vanlife #video about how their year has been a nightmare. They call it “Mr. Lemon” and paid US$100k for it. Their alternator burned up. The skylight would not seal and blew open when they were driving. The electrical system extending the vinyl awning broke. They had to buy a spare tire. They mention that being able to connect external propane appliances to the van’s propane tank has been useful. They like having swivel chairs for front seats. They also like having added a backup camera and a front camera with a memory card. I gave up watching after 9 out of 28 minutes.
on 02024-06-24#video #toread on Godot multiplayer P2P on Steam. Unfortunately it’s by #BatteryAcidDev, and so I expect the video to be half talking head footage, so I may try to see if there’s a better video about this. #todelete
on 02024-06-24#video on silicone waterproofing #toread
on 02024-06-23#video channel on things like microwave oven transformers, rocket fuel, microinverters, ammonia cars, iron powder fuel, etc. #toread
on 02024-06-23#video #toread from the Sun about NATO tank #weaponry in #Ukraine
on 02024-06-23#video about #C++ constexpr and #performance by #Daves-Garage (Dave Plummer) using a sieve of Eratosthenes example
Russian propaganda (?) #video #toread about #Houthis sinking a Red Sea ship full of drone #weaponry
on 02024-06-23#video #toread about raytracing #graphics from two-minute papers
on 02024-06-23Russian propaganda (?) #video #toread to scare people away from fighting in #Ukraine
on 02024-06-23#CodingAdventure #video #toread #tutorial on raymarching #graphics
on 02024-06-23#tutorial #video #toread on #Godot dedicated server executables (I guess ones that don’t require a GUI) but it’s a #BatteryAcidDev video so it's probably half talking head footage
on 02024-06-23another Sun #video #toread on turtle tanks in #Ukraine
on 02024-06-23#video #toread on #Israel Hamas war heating up in #Lebanon
on 02024-06-23#video #toread on #Ukraine naval #weaponry
on 02024-06-23#Nighthawk #video about DIY salt-based thermal phase-change #energy-storage. He’s using food-grade sodium sulfate in what looks like a fertilizer bag but is probably actually being sold as a phase-change material by Duda Energy, then mixing it with sodium chloride to approach the eutectic of the ternary system with water; he says 1.2ℓ water, 240mℓ of (presumably hydrated) sodium sulfate, and 60mℓ of sodium chloride melts at 18°. He says actually it has “multiple melting points” so it probably melts incongruently, giving rise to phase separation through repeated freezing; he suggests that gelling it with carboxymethylcellulose or xanthan gum (his choice) will solve that problem. He suggests sealing it in reusable silicone sandwich bags for use, which you can fit into the pockets of an ice vest. He seems to have measured it supercooling to 9°, then heating back up to 18° when it suddenly freezes, and then a second phase transition at -8°. He made a PCM blanket by soaking a towel in the gel and rolling it up inside a garbage bag, which seems like it would be a good approach to preventing leaks. He heat-sealed the edge of the garbage bag with a butane hand torch. #energy
on 02024-06-23#video about the Rocketdyne tripropellant #rocket design which had two successful test firings, achieving 542 seconds of specific impulse with a lithium/fluorine reaction preheated by a hydrogen/fluorine gas generator, with excess hydrogen added to increase exhaust velocity. The video ends with the Rocketdyne safety rap.
on 02024-06-20#video of hilarious #Ukraine #weaponry consisting of six AK-74s hose-clamped together to form a sort of many-triggered Gatling to shoot down drones with
on 02024-06-20#video from #Ukraine of fragmentation sleeves to adapt RPG #weaponry to kill people instead of tanks
on 02024-06-20#video report on Intel’s attempt to get back into EUV and the #USA’s attempts to get back into electronics manufacturing
on 02024-06-20#video #news of new turtle tank #weaponry designs in #Ukraine from a month ago
on 02024-06-20#video #news of #USA claiming Putin shouldn’t be “allowed to travel freely” to #Vietnam #politics
on 02024-06-20#video on #war: #Israel attacks #Hizbullah in #Lebanon, #Hizbullah threatens #Cyprus
on 02024-06-20#video on Russia manufactured 1500 new tanks to send to #Ukraine since 2600+ of its 3000 from February 02022 have already been destroyed, and supposedly is still losing 60 per month. Marina Miron says FPV drones have been the main reason Russia is losing tanks. Also that North #Korea has 3000 tanks. #war
on 02024-06-20#video #Samyam advertising GameMaker (blech) and her game Bumbi, dedicated to the memory of her dog
on 02024-06-20#video on officers reacting to Breaking Bad. #crime
on 02024-06-20#video #toread about purifying acetone. #bootstrapping #materials
on 02024-06-20#video on James Webb Space Telescope, on the new paper “The First Billion Years, According to JWST”
on 02024-06-20#clickbait #video of a talking head on #Antarctica debunking mysteries
on 02024-06-20#video that I thought was about the Ukraine war yesterday but actually is about a video game
on 02024-06-20#video by a VTuber on which #visual-novels engine you should use for #games. Reviews Ren'Py, NaniNovel, etc., but doesn’t show anything from any of them, just cartoony VTuber stuff, so I didn’t bother to finish the video.
on 02024-06-20#video demonstrating a small-scale hydropower #energy system from a mountain stream: “Glenburnie Hydro. Turbine: Powerspout GE 400. Head: 56m. Flow: up to 3 ℓ/s. Electrical output to grid: up to 750 w. Year installed: 2013. Danger: 400 volts.” Nearby stands an ornamental 120-year-old Pelton wheel. At 3.5ℓ/s it’s producing 3.2 amps at 320 volts. He also shows off his 3200Wp solar system, 120 meters up the hill through the forest at the house, where he charges his Nissan Leaf at 3.3kW, and his 10.2kWh LiFePO₄ battery storage system, about the size of a refrigerator; batteries made by BYD, controls by Sunny Boy. Then he shows his web interface.
on 02024-06-19#video #toread about a Japanese #vanlife couple living in a tiny minivan, like the Morris Mini of minivans, on a rainy day. They’ve lived in it for four years; they parked near a public restroom. The faucet is powered by an electric pump; they toast breakfast with a butane torch. An inverter powers hair curlers. Gas stations provide trash disposal. Laundry is done in a laundromat once a week. Bathing is done in public baths. A steering-wheel-mounted desk holds a laptop at face height, using a wireless keyboard in the lap. A top-loading refrigerator is under part of the bed, which occupies all of the space behind the front seats. Elaborate cooking: panko-battered skewers of many kinds with okonomiyaki sauce, mixing up the batter in a plastic cup, fried in a pot on what looks like an induction stove.
on 02024-06-19#video about Steam Deck touchpad keyboard input methods. Just a screencast, though, no handcam. There are dual touchpads, and they’re clickable, so you can move your thumbs around and see their positions on the screen before clicking. No words-per-minute figures.
on 02024-06-16#video another “haversack” #scouting video. Mostly he’s showing off his camping equipment: oilskin tarp, folding saw, ferrocerium rod, cigarette lighter, space blanket, tent stakes, etc. Seems like an 18-minute very boring ad by “A Way in the Wilderness”. Plonk.
on 02024-06-16#video #toread on a “haversack” for camping gear
on 02024-06-16#video #electronics #hardware #history on the Zilog #Z80 which apparently just got canceled (but is still in stock at Digi-Key) #toread
on 02024-06-16#video #Amish computer of 100% talking-head and stock image filler, largely about the US$798 “Classic Word Processor” from 02005 which ran Linux. #Plonk to "Techquickie."
on 02024-06-15#video #hoarding #toread on separating metals economically
on 02024-06-15short #video of #manufacturing keys for #keyboards out of Fimo or something similar
on 02024-06-15#video on making a “desktop pet” like oneko in #Godot. She used get_window().mouse_passthrough_polygon but couldn’t get it to work at first. I don’t understand what she changed to make it work. She says geegaz’s “Multiple-Windows-Tutorial” helped her a lot. She ended up using PhysicsPointQueryParameters2D and DisplayServer.mouse_get_position() to find out what objects her mouse was intersecting because of lots of difficulties with input management. And turning borderless off and back on again in order to get her transparent “world window” to resize properly. Finally she ended up hacking around things with C# and P/Invoke to call things in user32.dll after some help from ChatGPT.
#video on phosphoryl chloride #materials (no longer accessible anonymously)
on 02024-06-15#video on #Ukraine troops capturing some Russian troops in Vovchansk. Mostly footage of Twitter screenshots courageously recorded by #The-Enforcer, who then reads them out loud. Seems like pro-Ukraine propaganda. #spam
on 02024-06-15#video #toread on #manufacturing a thermoacoustic Stirling engine #hardware
on 02024-06-15#video #toread by #Hossenfelder on #quantum-computing supposed breakthrough
on 02024-06-15#video #toread on repairing ATX power supplies #electronics #hardware #hoarding
on 02024-06-15#video apparently #Ukraine drones (?) have attacked some airfields in Russia today, destroying some fighter jets, and the Russian stock exchange and national bank depository insurance agency (nationalclearingcentre.ru? in English?!) have their websites down. Russian government is offering peace terms that don’t require unconditional surrender, nor everything east of the Dnieper, just Donetsk, Luhansk, and Zaporizhzhia (is this really new?)
on 02024-06-14#video #toread of sorting #algorithms visualized with discrepancy chords (from each value’s current position on the circle to its ideal position on the circle)
on 02024-06-14#video #toread from #C5N saying that inflation in #Argentina in May was only 4% (per month, not per year)
on 02024-06-13#video of Gerald Sussman talking at Lambda Jam in 02013 about programming as a medium for the precise expression of ideas
on 02024-06-13#video about how current #weaponry (Javelins and drones) might make #tanks obsolete
on 02024-06-12#video of #Ukraine and Russia #tanks popping open like a jack-in-the-box when the ammunition inside gets blown up. Annoyingly dramatic music. In Spanish. Partly blames the autoloader, whose purpose was to make the tanks smaller, and therefore both harder to hit and cheaper, but also the fact that the other half of the ammunition is under the crew, a part which is often left empty nowadays. Also points out that usually the jack-in-the-box explosion is 30-60 minutes after the initial hit, giving the crew time to escape before that rather fatal explosion. Contrasts the Abrams’s blow-out panels. Suppoedly shows Lancet HEAT #drones destroying an Abrams at 11'05". #weaponry
on 02024-06-12extensive #video of #Ukraine drone attacks on Russian forces (66 minutes) #toread
on 02024-06-12#video on repairing angle grinders #hoarding
on 02024-06-12overview #video of #magnesium #materials refining, and in particular #Magrathea.
on 02024-06-12#Cesar #video demonstrates how to make an oil heating lamp out of four cotton wicks, discarded tin cans, and used (or unused) cooking oil. An upper louver part reaches about 150° and radiates a pleasant heat. I’m pretty sure kerosene would work even better, but actually kerosene is slightly more expensive; it’s about $2000 a liter, while sunflower oil is closer to $1300 a liter, and soy oil is $900.
on 02024-06-12#video #politics the “Ley Bases” passed in the Senate of #Argentina tonight, with the vice president Victoria Villarruel casting the tie-breaking vote with some political rhetoric at about 23:15. #Milei issued a communiqué describing the protestors burning a car and throwing stones outside the building as “terrorists attacking Congress” and describing the legislation as “el primer paso hacia la recuperación de nuestra grandeza”, “the first step towards the recovery of our greatness”. Apparently it has to go back to the lower house to reconcile the differences between the versions the two houses voted on. The video is somewhat repetitive and wastes time on a talking head.
on 02024-06-12#video #politics; tonight the senate is voting on #Milei’s “Ley Bases” proposal to utterly overhaul the law of #Argentina (and delegate an awful lot of power to him), while protestors outside are slinging rocks and burning a car
on 02024-06-12#video about the #Adobe terms of service update, which grants them the right to scan everything you put into their software, for example for training #neural-networks and “detecting” or “preventing” “legal issues”
on 02024-06-12#video says electric cars are under 8% of the #USA car market (IIRC 55% of the larger Chinese market)
on 02024-06-12#video of eight US-made armored vehicles destroyed by propeller-powered US$35000 Russian Lancet kamikaze drones near Bakhmut in #Ukraine. This resulted in the #USA imposing sanctions on the Russian company that made them.
on 02024-06-12#video of the results of Russia’s latest attack on Kyiv, #Ukraine. The Air Force says it shot down all 24 drones and five out of six missiles (one ALBM, four cruise missiles, and an Iskander ballistic missiles). Apparently one got through. Poland scrambled jets in case they were aimed at Poland. Russia claims to have nuclear warheads deployed in Belarus. Russian warship and nuclear submarine are curently in Havana.
on 02024-06-12#video about the French Foreign Legion entering #Ukraine two weeks ago as “instructors”. Also says that as of 02024-05-27 the countries that allowed their weapons to be used (by Ukraine) on Russian soil were Latvia, Lithuania, Estonia, Great Britain, Sweden, Finland, Netherlands, Poland, and Czechia; the #USA joined the lis a week ago. Lots of time-wasting talking-head and stock footage. Video is 28 minutes long, therefore #toread
on 02024-06-12#video about Russian “turtle tanks” in #Ukraine, tanks with sheet-metal sheds on top, which apparently help a lot against FPV drones but can’t turn their turrets much. Sometimes hanging chains obstruct quadcopter entrance through openings. Relevant that #USA and #EU stopped sending much aid in October.
on 02024-06-12#Ukraine #video about HIMARS attacks on Russian bases on Monday.
on 02024-06-12another #video about improvised drone #weaponry, contrasting #Ukraine’s improvised FPV kamikaze drones with RPGs with Russia’s Iranian-made GPS(?)-targeted Shahed-136 drones (though I’m pretty sure Russia makes plenty of its own FPV kamikaze drones). Unfortunately mostly filler stock footage
on 02024-06-12#CodingAdventure #video about #raytracing #graphics with BVH in #Unity. He’s using AABBs split spatially in half along the long axis, with triangles assigned according to their centers and the AABBs grown to fit. He’s using the Stanford Dragon as his test mesh. Apparently Unity’s shader language doesn’t support recursion, nested lists, or dynamic allocations, but syntactically looks very much like C#, except for out or inout on some parameters. while-loops are fine. You communicate with the shader by SetBuffering a “material” (RayTracingMaterial, I guess is what he called his shader), but the buffer names aren’t checked. Also he crashed the GPU by overrunning a buffer. Aha, and Unity wraps your mouse around the left and right edges of the screen when you’re dragging left or right on a number to adjust it. By building a 27-level deep BVH over an 81000-triangle reduced version of the model and using early ray termination tests, he was able to get that model to display at 325+ fps instead of being slow and janky. Further optimizations (maintaining integers rather than structs on the BVH stack, splitting nodes using the “surface area heuristic”, and reducing the size of his node struct) got to 600+. This version could handle the whole 870k triangle model at almost 500 fps. Finally he adds reflection and renders the model in the Sponza Palace.
#Tech-Ingredients #video about #manufacturing diffraction grating #optics in chocolate
on 02024-06-12another #video about #weaponry in the #Ukraine war, with Ukraine blowing up various Russian tanks with drone #weaponry
on 02024-06-12another #video about #weaponry in the #Ukraine war, with Ukraine blowing up three Russian tanks with drone #weaponry
on 02024-06-10#video about #Ukraine withdrawing US-provided Abrams M1A1 #weaponry from the battlefield last year due to their vulnerability to Russian drones. Mostly stock footage, but I think this is a Russian propaganda channel
on 02024-06-10#video on #Argentina’s lost opportunities and unreasonably positive expectations for #Milei
on 02024-06-10#video on an electrical edge finder for #machining
on 02024-06-10#video on an orthopedic screw that costs fifteen times its weight in gold
on 02024-06-10#3D-printing #video on #print-in-place #flexures #mechanisms that shoot a toothpick
on 02024-06-10#ElAngelito #video on #electrolysis sharpening of steel wires in a stainless steel sugar bowl with a saturated table salt solution. He’s using an inverter arc welder as his power supply set at the lowest amperage. He got thick fencing wire to sharpen to a point in three or four minutes of holding it in the salt water. #materials #manufacturing #bootstrapping
on 02024-06-10#video on #electroplating: 200g blue vitriol (Zep root killer), a drop of HCl(aq) (Klean Strip concrete etchant), 50mℓ H₂SO₄ (Zep drain opener), 950mℓ distilled water, and an unspecified brightener not shown. He plates at 0.4 volts, getting about 150-400 milliamps on a Star Trek TNG communicator badge. #electrolysis #materials
on 02024-06-10#video on burr identification and removal in knife sharpening. Explains what a strop is actually for and shows microscope shots of the edge at various levels of magnification. #machining
on 02024-06-10very impressive #video of #control of a triple inverted pendulum, going through all possible transitions between two of its eight equilibria, from Embedded Control Lab in Korea.
on 02024-06-10#humor #video by a Japanese-Argentine YouTuber about his culture shock on visiting Argentina after a long time away #formina
on 02024-06-10#video demonstrating evolving #neural-networks to control a chaotic inverted double pendulum in simulation by gradually ramping down friction and ramping up gravity as the control circuits get better. Nice earth-tone cartoon UI with muted reds, greens, and yellows for highlights. On one run he only had success after 8 hours. On a later run where he added a penalty for moving the cart too much, only a bit over 2 hours. At minute 20 of the video he ended up with a network with 30 hidden nodes, 321 connections, and I think 28 layers, running at 60 hertz. Later he improved this.
on 02024-06-10#video on #sorting #algorithms with colors #formina
on 02024-06-10#video #toread on how to use #Godot nodes properly
on 02024-06-09#video #toread on 13 #Godot hacks (maybe this is the shitty one that just shows you things that are in the manual)
on 02024-06-09#video #toread on #Godot classes
on 02024-06-09#video #toread on #Godot resources #todelete
on 02024-06-09#video #toread on #wire bending artist
on 02024-06-09#video on 18AWG round copper #wire bending for making beautiful shapes, swirls and scrolls and stuff. Recommends sharpieing the round-nose pliers to get repeatable bend radii. “16-gauge, the loops tend to oval.” She likes to straighten her wire by pinching it between a clothespin and a piece of plywood really hard and pulling it through with pliers; alternatively she suggests clamping one end in a vise, the other end in some serrated-jaw pliers, and pulling until the wire stretches. Or, for shorter pieces, rolling it between a steel block and I guess a sheet of MDF. She recommends for finished (not practice) pieces to finish the end of the wire a little bit to be nice and smooth, using either a fine file or 400-grit sandpaper taped onto a tongue depressor, even after using a flush cutter to cut the end off flat. To make a loop she grasps the wire at the desired radius of round-nose plier, by the end of the wire (“not sticking out”), and bends it about 90° at a time before going back to get another grip, while using the other hand to pull the wire tight against the plier jaw. To make a continued spiral (“scroll” I guess) she switches to flat-nose pliers to grasp the whole loop between the jaws, with the plane of the loop parallel to the plier jaw surfaces. Demonstrates hammering the wire with a shiny and smooth hammer on a shiny and smooth steel block (because any texture will be transferred to the wire).
on 02024-06-09#video playlist #toread on bent #wire #mechanisms “Wire Crafts”
on 02024-06-09#video on bent #wire #cardboard #automata #mechanisms. Shows making crankshafts from galvanized steel wire with pliers, a frame bent around a plastic box using cut bicycle spokes to form loops. Shows how to loop a thinner wire around the crankshaft several turns to form a triangle to prevent the connecting rod from sliding along the shaft. Suggest using kitchen tongs (?), a square pipe, and a sort of clamp for wire bending as well. He mentions copper, “M.S.”, zinc, and solder wire. Demonstrates scribing a plastic box with a sort of improvised height gauge on a normal Formica table, and using a hot wire to puncture it. By godbolerr@gmail.com, Ravindra Godbole.
on 02024-06-09#video on bent #wire #mechanisms. He recommends using a plastic-coated clothes hanger, measuring out bend points in advance with a ruler and permanent marker, using wide-point needlenose pliers, bending entirely from one end, always putting the pliers on the same side of the bend (he’s using the side that has already-bent stuff on it), etc. The half-hour video is entirely about making a crankshaft for driving wire automata.
on 02024-06-09#video on how many plants you need to breathe; turns out 80 liters of Chlorella vulgaris bioreactors is enough to absorb about 90% of the CO₂ a person exhales. But this involved letting the CO₂ levels reach 3500ppm. So he added another 50 “gallons” (190 liters) of Chlorella, which stabilized the CO₂ contents in the high 2000s.
on 02024-06-09#PlasmaChannel #video #toread about high-voltage ionic wind nebulography
on 02024-06-09#ThisOldTony #video about toggle #mechanisms (which he keeps calling “over-center mechanisms” for some reason), with an overview of wire flip-top mechanisms, cabinet doors, toolbox latches, boot latches, barrel clamps, suspender latches, vise-grips (“locking clamps”), woodworking toggle clamps, etc. Then he segues into a discussion of living hinges (which he doesn’t name), including bistable designs. #humor
on 02024-06-09#Coy-Beardmore #video on salvaging industrial robot arms. Holy shit, US$80 for a cleanroom #SCARA arm. And then a guy who has a warehouse full of used robot arms gave him another one, plus the power supply and control electronics, for free. So then he spent a bunch of time with a vertical milling machine making solid steel rails to mount the robot arms on. Adept V+ is running in a windowing environment I don’t recognize, on some kind of OS with drive letters. Software dates 01984-01995, supporting TCP/IP, and V+ is apparently from 02000. He had to troubleshoot a short circuit in the wire to the Z-axis home sensor, whose insulation had frayed; it kept blowing a 2-amp fuse when the switch closed. There’s some kind of weird bespoke programming language visible at 4'56". #hoarding #robotics
on 02024-06-08#video on salvaging the mirror #brushless motor from a laser printer. #hoarding by #Zafer-Yildiz. I expect disappointment from watching a video of his previously. Jesus fuck, he’s touching the first-surface mirrors with his fingers. Which are dirty. ALL OF THEM. Good tip on identifying power rails from the polarization of a smoothing cap. By grounding different signal lines on the connector through a 1kΩ resistor he gets it to spin up! But shows no waveforms. He gets it to spin faster by overvolting it (initially 12V from his lab supply.) By feeding in a varying-frequency sine wave on a control pin he also gets different speeds. Not that bad a video for 5 minutes I guess.
on 02024-06-08#video on salvaging a flatbed scanner. #hoarding #toread
on 02024-06-08#toread #Godot 4 #compute-shaders #tutorial #video
on 02024-06-05#video on one month of gamedev in #Godot, almost entirely talking-head filler, waste of time to watch
on 02024-06-05#video on #Godot by #DeveloperEzra mostly about Brackeys using it
on 02024-06-05#video #toread #Godot #tutorial on a simple RPG textbox
on 02024-06-05#video on Elon Musk recommending Linux because of #Microsoft-Recall #paranoia mostly consisting of stock footage of people using terminal emulators to do irrelevant things. Doesn’t actually talk much about #elmu, but does repeatedly show the Joe Rogan footage of him smoking pot. Waste of time.
on 02024-06-05#video #toread #Godot 4 ledge-climbing #tutorial
on 02024-06-05#video #toread on #Microsoft-Recall making people switch to Linux #paranoia
on 02024-06-05#video #toread on running a pirate #radio station and getting busted by the FCC
on 02024-06-05#video on targeted offgrid comms with "T-Rex Labs" #paranoia. KT7RUN and KK4FMV are trying to communicate over a few thousand km using a 20-watt Xiegu G90 HF backpack ham #radio transceiver (20 and 17 meters). He mounts a mast on the trailer hitch of his jeep out in the middle of the Arizona desert and ran an inverted-V (dipole?) antenna from it, suffering a cactus injury. They’re going to try using the #JS8 digital mode with KN4CRD’s #JS8Call software on a Panasonic Toughpad running Ubuntu. Oh and maybe it’s actually 100 watts. He does succeed in talking to somebody in Tennessee with voice, and somebody in New York over JS8, and finally his intended contact. Finally he used a tiny pocket Garmin InReach MINI 2 satellite radio to communicate successfully.
on 02024-06-05#video #toread about #visual-novels #games explaining the genre conventions
on 02024-06-04#video on game engines for #visual-novels #games showing Rakugo, Ink, etc., but no demos of anything. Basically this is a video of other people’s websites.
on 02024-06-04#video #toread on #Godot addons
on 02024-06-04#video on #Godot 4.3 new features like TileMapLayer, Parallax2D, and global groups.
on 02024-06-04#Hossenfelder #video on sugar alcohols. When she cut these #food-additives out of her diet, her chronic intestinal problems went away.
on 02024-06-04#video on why #Hossenfelder left #academia when covid came, explaining how the money flow works, and how most academic #research is bullshit
on 02024-06-04#Hossenfelder #video on #neural-networks for some reason not overfitting: the "double descent" problem
on 02024-06-04#video of a detailed anatomy of an AM #radio transmitter doghouse and tower. #electronics
on 02024-06-04another carbon #arc-lamp #video #formina; he strikes the arc at 6'17". It turns out to be from a movie projector.
on 02024-06-04#video of enclosed carbon #arc-lamp. He demonstrates an Adams & Bagnall 133-Hz 110-volt 7-amp arc lamp designed for 75 volts across the carbon electrodes, warning that if you run it on lower frequencies its parts may overheat. He does eventually get to showing its workings at about 11 minutes, demonstrating the negative feedback #mechanisms that maintain the arc at the right length. He finally turns it on at 18'45".
on 02024-06-04#video of #3D-printing pressure vessels (tiny propane tanks) by spray-painting them with “dichtol” to make them watertight and gas-tight.
on 02024-06-04another #video on the #Octopus curve tracer. #electronics #hardware
on 02024-06-04#Godot #tutorial #video on putting scenes (rather than atlases) into tilemaps
on 02024-06-04#video on how Alan Zhang got his #eVTOL actually #flying at last, for 3.28 seconds on its maiden flight and 68 seconds on its fourth, after redesigning it to be 90kg and more rigid (though still far too rectangular). He’s hoping for a 70kg payload, so it maybe falls short of being a flying car.
on 02024-06-04#humor #video on making Flappy Plane in Unreal. #games
on 02024-06-04#video on fraudulent yellow US$3 65-watt AliExpress charger which really only provides 12 watts and has iron weights glued inside the case to make it feel heavier. Also they used a non-safety-rated capacitor between the high and low-voltage side. In operation its internal parts heat up to damaging but not dangerous levels.
on 02024-06-04#video #tutorial on the #GIMP foreground select tool
on 02024-06-02#AmericAndo #video #vanlife on getting kicked out of a Wal-Mart parking lot in Calgary
on 02024-06-02#video on Terry Davis’s game “After Egypt” #TempleOS #games
on 02024-06-0240' #video by #Psychogenic-Technologies (Pat Deegan) on designing analog ASIC #electronics #hardware using Tiny Tapeout’s “new analog capabilities”. Basically he’s hacking together a SAR ADC with an 8-stage resistor ladder, although most of that process is omitted; he submitted it to Tiny Tapeout 6 as “WoWA”. I didn’t realize #Tiny-Tapeout had a WebGL GDS viewer. The video has an annoying amount of talking-head filler. He recommends using tinytapeout_analog_vm to get started quickly, and Efabless’s video, “Webinar - Analog schematic capture & simulation with Stefan Schippers”, who wrote #Xschem, which he’s using here, with the open SKY130 PDK. He remapped Magic’s and Xschem’s keys to match Kicad. He says both Kicad and Xschem do simulations in Ngspice. Xschem’s UI for exploring simulation results looks pretty interesting, being able to click on a waveform out of many waveforms on a plot to change which waveforms are displayed in other linked plots. He does a little bit of demo of using Magic, which evidently involves typing Tcl commands in a command window as you use the mouse, and he lays out a two-MOSFET mixer circuit in it, with guard rings and everything, after having designed and simulated it first in Xschem. He says Netgen (?) is a good LVS (layout vs. schematic) checker, even though its errors are hard to understand. He recommends simulating your digital blocks with Verilator.
#video about reaching #Argentina for the first time last month, naïve young US couple eating empanadas and visiting El Ateneo and the Plaza de Mayo etc.
on 02024-06-02#RISC-V vector extension #video by #LaurieWired aimed at super beginners, explaining an #asm example line by line, then walking through it in GDB; apparently the Kendryte Canaan K230 chip supports RVV 1.0. But she doesn’t even mention T-Head, so I’m not sure I can trust her information. Like, her example assembly program doesn’t loop, and I think it needs to loop in case the vector registers on the hardware are less than 256 bits. Like, I think she needs something like blt t2, a3, loop_start to get the vector length agnosticism she’s talking about at the beginning but never explains.
#video about nakst’s Essence OS: “better than #TempleOS” but the video is a 2-hour stream so I don't think I’m going to watch it. He does get it running in QEMU. The streamer is impressed with things like the guy writing his own C-like scripting language interpreter, using his own Tk-like GUI thing for the build configuration (under Linux; it is cool that it has such a thing but unfortunate that it is using a VGA font), that it uses busybox to provide a POSIX environment, etc. He says a translucent overlay saying “Text copied” when he hits ^C is “damn sexy”. Seems to have nice small executables: 15K for a GUI game of 2048, 14K for an IRC client, 74K for the file manager. It uses a “.esx” extension for these. Busybox does run successfully under it, but it’s not succeding in launching any other executables, giving a spurious “Out of memory” error. He is not impressed with the “script console” which gives an nicely formatted error on everything he tries, even the “help” command. He looks at the 2048 game, which is 13K of C++, but in a fairly C-ish style. Seems like drawing is done by handling ES_MSG_PAINT messages in a ProcessApplicationMessage(EsMessageReceive()) loop, like in Win32 or Win16. There’s a hello-world in C. So this guy (#Tsoding?) streamed writing the Game of Life for it without looking at the documentation, just example code. He ran into a lot of hitches like needing to explicitly request redraws. He solicits donations via Bitcoin but also complains about the cryptocurrency fad.
#PhotonicInduction #video about a 30kW xenon lamp and a 4kW one. He runs them off a DC welder, plus a high-voltage AC starter. They are very bright and generate a lot of heat. The 30kW lamp has what appear to be plumbing fittings to run water through the electrodes, but the 4kW one relies on radiative cooling. Running the 30kW one at 4kW without attaching the water seems to be overheating it, and they think it melted the anode, though I don’t see it. Oh, they say the xenon escaped.
on 02024-06-02#video devlog about making #visual-novels in #Godot. Unfortunately the video is about 60% stock-footage filler, turning a 6-minute video into a 15-minute one. I’ll be sure not to watch any more videos by "Gary the Enchanter". #games
on 02024-06-02#video about #manufacturing a simple electric arc furnace for melting brass
on 02024-06-02#video about #manufacturing silicon #materials from sand with thermite. I didn't finish it because after the first five minutes he was still just talking to the camera. Luis Horas is not always this bad.
on 02024-06-02#video #mechanical #clickbait high-precision speed-reducer uses rope. This is a variant of the Jacob’s ladder rolling flexure pivot, with the variant that one of the rollers is a tiny capstan and therefore the angular velocity of the actuated joint is much lower than that of the capstan itself. Cable drive means limited range of motion, but you get a lightweight joint with no backlash and hopefully little wear. #flexures
on 02024-05-31#video #clickbait #manufacturing “illegal stove” that “uses water” (to increase turbulence and therefore combustion rate and therefore temperature in a waste-oil burner welded up out of steel pipes). Nothing illegal about it, it’s just a water-blown blowtorch (that probably produces a lot of CO).
on 02024-05-31#video on a #Microsoft Windows enthusiast moving to Linux at last because he’s “sick of this”. He was impressed that Linux Mint just worked out of the box on his NVIDIA Optimus Alienware laptop. He uses Inkscape, KiCad, and DaVinci Resolve, and plays games, and they all worked. But the video is almost entirely just a bunch of screenshots with the Ken Burns Effect. He does include a little bit of footage from Helldivers II. Shows Steam statistics and mentions Linux now has 1.9% market share to MacOS’s 1.35%. But he’s sticking with Microsoft Windows 10 for now.
on 02024-05-31#video on #manufacturing a steel-cutting machine from windshield wiper motors. Kind of #clickbait, the motor just moves a plasma torch along rails. I mean, he does show the process of fabricating the machine out of mostly cold-rolled plate with an angle grinder, drill press, and MIG welder, but then he uses fancy precision-ground hardened steel rails and sliding ball bearings. And the actual cutting part is the torch, which he doesn’t make.
on 02024-05-31#video #toread about #energy in #Antarctica: 511 billion barrels of oil
on 02024-05-30#video #tutorial on #Godot multiplayer platformer based on the Brackeys platformer tutorial. ENetMultiplayerPeer and the Godot multiplayer API looks really easy to use in the case where it’s okay to depend on a server. I didn’t know Godot’s debug menu had a “run multiple instances” submenu, and in project settings, there's a Display→Window→Always on Top option, which is very useful for debugging. The MultiplayerSpawner node automatically replicates the scenes under its spawn path across all the players in the cluster, using its auto-spawn list to figure out how to instantiate them, except that it seems like actually you have to write code to manually instantiate scenes there? Maybe only on the server? By default only the server can change any (MultiplayerSynchronizer) node that’s synchronized across clients, but it can .set_multiplayer_authority(id) on a node to allow one of the players to change it instead. The MultiplayerSynchronizer synchronizes properties of other nodes. #BatteryAcidDev’s recommendation is to only give the player authority over their inputs, not over their player’s position. Lots of talking-head filler footage. #toread
#video #toread about the last days of the Bethlehem #Steel basic oxygen furnace
on 02024-05-30#video #toread about how more #games are going multiplayer
on 02024-05-30#video about #3D-printing buildings and why it leads to problems. Lots of talking heads and stock footage, but there is at least some footage of concrete 3-D printers. A lot of it seems to be about how you need trim to cover the seams between window units and lumpy 3-D-printed concrete. Also, coarser aggregate improves interlayer adhesion, but of course worsens tolerances and clogs nozzles. Smoothing rakes also help with that, I think, but he says they result in bumpier surfaces. Repairability is a problem.
on 02024-05-30#video from 02016 of Terry Davis (the #TempleOS guy) doing a physics #simulation with his software SimStructure, programming a PID controller into it.
on 02024-05-30#video of #LinusTechTips looking at #TempleOS, after Terry Davis’s death. He’s impressed. Then he tries to sell you a scrotum shaver.
on 02024-05-30#video of Terry Davis explaining how #TempleOS aspires to be a Commodore 64 #retrocomputing, while Linux people are all deluded with their file permissions and aspirations to be a 01970s mainframe that never crashes. Linux is a semi, Windows is a car, TempleOS is a motorcycle. “You know what’s pretty crazy? If you lean over on a motorcycle, it crashes. Isn’t that crazy? Don’t do that.” He argues that virtual memory is more important when you have 100 users using a 2-megabyte mainframe, and Linux gets unusably slow whenever it goes into swap, which is true. He loads whole files into memory instead of reading them sequentially because his highest ideal is minimum lines of code. So he has no linker, just compiles from source to executable with F5 with no separate compilation (just <a href="../tag/include.html">#include). He demonstrates recompiling his 30kloc kernel and 20kloc compiler in under a second. He spends a lot of time gloating about how he’s a “shepherd” rather than “sheep”, likening himself to Tesla, and how other people aren’t very smart. Then he explains how he doesn’t change privilege levels or memory maps, so he can do 4 million task switches per second. His explanation is somewhat disjointed, jumping from topic to topic frequently. “In fairness of, okay, so, when I’m waiting for my disk, I do while (INport()) Yield(). Okay, and what it, this is, I don’t know, I don’t care, you know, somebody’s going to call it ‘blocking’. It’s these little brainwashed book people who couldn’t, it’s Tesla being mocked by, you know, somebody who, you know, reads a book. You know what I'm saying? If you got it out of a book, you know, yeah, whatever. So I adapt to a new reality. They’re all fighting the last war. They’re making 1970s mainframes. I don’t know why. And they’re mocking me. ... We all started with Commodore 64s. Nobody, nobody knows what a pointer is, nobody knows what assembly code is, they’ve all been so confused by the liberals trying to make it easy for them.” Most of what he says here is true, despite the confused presentation and his delusions mentioned elsewhere. The video gives every appearance of having been recorded in a VGA text mode (the overlapping windows snap to character boundaries) until rotating 3-D graphics appear in the middle of a scrolling text window at 22'39" — for some reason their scrolling sometimes gets desynchronized from the text they’re scrolling with.
#video of a black flame burning salty methanol against a background illuminated with a low-pressure sodium lamp
on 02024-05-302-D #Minecraft #video #games
on 02024-05-29#video of #algorithms for pathfinding, such as A*, etc.
on 02024-05-29#video on how to set up 2-D glow #graphics in #Godot (this was the one that got me over the hump to actually getting it working)
on 02024-05-28#video #toread about visualizations of pathfinding algorithms
on 02024-05-26#video #toread about 13 #Godot add-ons to make game creation faster
on 02024-05-26#video about yet another “ten things I wish I knew sooner” tips about #Godot 3. Cubic interpolation, color modulation, autoload globals, change_scene, importing pixel art sprites (which changed in 4), using spritesheets in controls (as opposed to Node2Ds), some more stuff about setting up controls, etc.
#video about #graphics for 2-D #games in #Godot. Super awesome tips: the highest-impact visual tweaks to add. Specifically, 2-D glow, ACES or filmic tonemapping, using a color palette from Lospec or something, set up your camera well (maybe focusing on what the player is pointing at), adding lights, adding particles, and easing (“animating”) transitions with lerp or Tweens.
on 02024-05-26#Skyentific #video of “virtual sphere rolling joint” #mechanical robot arm
on 02024-05-26#video of 10 #Godot tricks “we wish we’d known earlier”: editing the same property on multiple nodes, the per-node editor-description field, an event-bus singleton, saving color presets with the + at the bottom of the color picker, a thing about copy/pasting autotile bitmasks that only applies to Godot 3, using enums with bitmasks, _notification especially for NOTIFICATION_PREDELETE, databases of game items exported from a spreadsheet in CSV,
#video of 80 #sorting #algorithms with music, including lots I hadn’t heard of: Andreysort (Grailsort), bitonic sort, odd-even sort, circle sort, cycle sort, weak heap sort, etc. It’s always sorting the numbers 0 to N (either N=8, N=16, N=32, N=64, N=128, N=1024, or N=2048) and emits two tones whose frequencies are determined by the two numbers being considered.
on 02024-05-26#video of #self-replicating Langton Loops running out of space
on 02024-05-2601950s #video of how an oil refinery works, demonstrating fractional distillation, vacuum distillation, cat cracking with fluidized-bed silica/alumina sponge, catalytic reforming with platinum supported on sapphire to raise octane, etc. #materials #bootstrapping #scouting
on 02024-05-26#video #toread of 10 #Godot mistakes
on 02024-05-26#video of #shaders for simulating fire #graphics in #Godot with noise and a fire texture made in Krita, sampled twice and multiplied, then mapped through a fire colormap
on 02024-05-26#video of Mike Albaugh running Fortran II on an IBM 1401 at the Computer #History Museum. He’s using the famous 63-pass compiler. #retrocomputing
on 02024-05-26#video #tutorial on #particle-systems, including #graphics of fire, explosions, retro video game explosions, implosions, and shattering sprites. Also covers #Godot’s AnimationPlayer node a bit.
on 02024-05-26#video on #Godot 4 features including tilemaps #tilesets
on 02024-05-26#video #tutorial on #Godot 4 tilemaps (4 minutes) #tilesets
on 02024-05-26#video about something or other about #games that “don’t fake space”
on 02024-05-26#Godot adds an icon.svg to each new project which is super handy for placeholders in #games. Previous versions had icon.png instead. #video #tutorial
on 02024-05-25#video #tutorial for generating sprite sheets from a #3-D model by scripting #Blender in Python for #games
on 02024-05-21#Godot #tutorial #video on VHS-like rendering effects for #games #toread
on 02024-05-21#video on prerendering 3-D models from Adobe’s Mixamo into spritesheets using #Blender #games
on 02024-05-21#Godot #games 2-D character movement #tutorial #toread #video
on 02024-05-21#Godot #games #tutorial #video
on 02024-05-21how call_deferred worked with yield and threads in #Godot 3 #video #toread
10-minute #video #tutorial on #Godot’s profiler, which lets you click on a lag spike and see what was using time during that frame, plus other stuff
on 02024-05-21#video #ElectroBOOM on trying to make metal arc in a microwave oven
on 02024-05-21#video about 10 more “waifu” #games from Steam. The first is “The Citadel”, a sort of Wolfenstein 3D FPS, which is kind of disturbing. “Anime World”, a kind of lame low-poly 3-D RPG where you fight goblins. “Megacraft, Hentai Edition” has buxom catgirls in bikinis and seems to be a sort of third-person Minecraft clone with them. (And without enemies.) Eventually he tunnels out of the bottom of the world and falls forever. “Together BnB” features uncanny-valley humanoid characters in revealing outfits who flirt with you. (Then there’s a Raycon earbud ad.) Then he goes deer hunting in the fog with a handgun. Then there’s a Leisure-Suit-Larry style menu-driven dialog. “Hentai vs. Furries” has cartoony figures in bikinis killing stuffed animals with a semiautomatic rifle.
on 02024-05-21#video about 10 “waifu” #videogames from Steam. Hentai Sheriff, Anime World War 2 (an FPS), Anime Redemption (a third-person shooter where your character is an anime woman wearing a bikini), etc. Pretty horrific.
on 02024-05-2120-minute #video #toread about #dialogue in #Godot using Dialogic, which I thought was so far only for Godot 3, but maybe that’s just that Dialogic 2 isn’t in the Asset Library
on 02024-05-21super-simplified #video walkthrough of setting up water in #Godot with #shaders
on 02024-05-21#video about Eulerian fluid #simulation with #shaders by "RL Hugh" who seems to be #CodingAdventure (Sebastian Lague) in some sense
on 02024-05-2177-minute #video about #NileRed’s life story. He says his motivation is that he can make things he can’t buy, like bromine, which was similar to his motivation for “urbexing”, exploring abandoned buildings in Montreal to get photos of their interiors. He’s thinking he might like to be a “real” filmmaker. How he decided to stop studying for medical school after he volunteered in a hospital for a while. Lots about the headaches of running a company, even a YouTube production company, and having people depend on you. Financial prospects of different careers. He initially hired his brother for what he had been making at Walmart, US$2000 a month (or CAD 2000?), while he was taking home US$1000 a month for himself, because he was living with his parents. The burdens of fame, no longer being able to be anonymous in public. Mostly just talking heads, but at least they’re talking to each other instead of just talking to a camera.
on 02024-05-21#video on MIT-licensed #Godot #dialogue system for #visual-novels. It’s called GodotEzDialoguePlugin because the author is YouTuber “real-ezTheDev”, aka #DeveloperEzra. He demonstrates using the Godot UI widgets, defining new node classes in scripts, connecting signals to callbacks, getting bugs due to implicit @onready invocation, loading JSON files in the node inspector, etc., really a full Godot development tutorial. He came up with an ad-hoc ASCII textual language for writing his dialogues, including --- for page breaks within a single dialogue, which displays as a boxes-and-wires graph. It looks like it might be a little more work to use than #Dialogic, because it’s much more narrowly focused, but by the same token, maybe more flexible and easier to debug. The dialogue system supports variable interpolation and conditionals on state variables passed in from the main GDScript logic, as well as emitting “custom signals” that are handled synchronously. #games
#video on setting up PID #control for a ball on a beam #toread #Electronoobs
on 02024-05-21#reaction #video on William Osman’s X-ray machine #toread
on 02024-05-21#video on building an X-ray machine and people being mad. Mostly talking-head filler though. In fact the only actual content in the video is webpage screenshots and an ad for some kind of food thing. William Osman, make better videos please.
on 02024-05-21#video #toread beginner #Godot #games #tutorial
on 02024-05-21#video #GreatScott on tiny power #electronics #hardware, building PCBs around a TI TPS63020 4-amp buck-boost converter, which takes 1.8–5.5V and provides 1.2–5.5V (programmed with a voltage divider) with 25μA of quiescent current, using a 2.4MHz switching frequency so it can use tiny external inductors and capacitors, with only 8 passives in all. So he builds the new PCB with 0805s (because he find 0604s hard to hand-solder). The dadashit has a very nice suggested layout. Despite worrying about hand-soldering, he paste-soldered the components with a stencil and reflowed them on a tiny 3-cm-square hotplate he evidently had, labeled MHP30. The 5V output was 5.115V (2.3% high, a big sloppy), while the 3.3V output was 3.393V (2.8% high). He got 2.8A out at 3.3V and 2.04A at 5V, with 71%–91% efficiency, the higher numbers being at lower loads. He did two more tighter layouts where he had to hand-solder some caps on the back after reflow; the current capability decreased to only 2.0A at 3.3V but the efficiency was the same. Comments suggest TPS631000 and TPS63900 as even lower-power alternatives.
on 02024-05-21Very poorly edited #video how to make simple #visual-novels in #Godot 4 with #Dialogic. Apparently you put stuff in the “addons” directory to make them appear in Project Settings → Plugins. After creating the dialogue you can Dialogic.start("res://whatever.dtl") in your _ready. #games
#video “I accidentally made Blender in #Godot” #Whisk basically manually placing triangle vertices on movable axis-aligned planes with grids on them, pretty awesome
on 02024-05-21#video on top #Godot 4.2 new features: real 2-D HDR and therefore glow, 3-D F*** super-resolution, a reworked particle system, creating custom texture objects in compute shaders, dynamically recomputed nav maps, fixes to tilemaps including flipping and rotating tiles, code region folding, debugging threads, in-editor hot reloading of GDExtensions (in C++), GDExtensions in wasm, C# in wasm and Android and iOS, etc.
on 02024-05-20#Alpha-Phoenix #video about how electrical impulses propagate through wires, reflecting a step off a short circuit and varius other impedances. Very nice four-dimensional plot of voltage against position, time, and impedance.
on 02024-05-20#video of #Godot addons for 3.5 (some of which don’t exist yet for 4.x)
on 02024-05-20#video #tutorial by Brackeys on making a 2-D platformer in #Godot
on 02024-05-20#video of making a 3-D dungeon in #Godot 3, pretty simple game with a tilemap and his own homebaked system for mapping that onto a 3-D model
on 02024-05-20#video #tutorial of making a 3-D dungeon in #Godot with #Blender
on 02024-05-20#video of talking head shouting about eroge #games she really likes
on 02024-05-20#video on making #shaders in #Godot for fake water #graphics or fire, etc. He maps a sum of two noise textures (fed in as uniform sampler2Ds) to the water depth, uses that as a displacement to sample from another texture, then smoothsteps the depth to get some white highlights on the waves.
on 02024-05-20#video of a bit of a dev log in #games #toread
on 02024-05-19#video on #graphics performance of sunbeams in a forest in #games
on 02024-05-19#video review by “sydsnap” of “beat refle”, a massage version of Dance Dance Revolution, one of the new lewd video #games that got kicked off Steam. Lots of shouty YouTuber talking head wasted time.
on 02024-05-19#graphics in #games look cool when your #shaders posterize the V channel of HSV, or all three. #video
on 02024-05-19#Bitluni wrote an assembler and interpreter for a new CHIP-8-like bytecode in one day on stream. #video of his 10¢ CH32V003 240-LED matrix board. He wants to switch to a CH32X035, which sounds like it might not be #RISC-V, but has USB-C support built in. Previously he had the buttons on a resistor ladder. He has a tiny little postage-stamp-sized hotplate to reflow his QFNs. If you short D+ to Vcc at powerup time it goes into programming mode and you can install new firmware. #electronics #hardware
on 02024-05-19#Godot removed VisualScript #visual-programming in Godot 4. #video Now it’s called Godot Orchestrator and is a GDExtension. One of the suggested uses is “Design complex dialogue conversations for NPCs for any game,” as in, #visual-novels. It’s literally programming by drawing flowcharts, like, 01950s style flowcharts, with arrows to indicate control flow. The main differences are that now the box corners are rounded, the arrows are curved, and there are additional arrows for dataflow. I can see why GameFromScratch said “honestly it never felt like an improvement or viable alternative to GDScript. In fact, it always felt like writing GDScript, just in a less efficient manner than typing.” It’s almost like #GRAIL.
on 02024-05-19#Godot review #video #toread (after using it for a month)
on 02024-05-19#video on #Godot #mapgen #graphics #toread
on 02024-05-19#video on writing 50 video #games in 10 years, mostly in PyGame. Some pretty interesting visuals with particle systems and whatnot.
on 02024-05-18#styropyro 100 car batteries in parallel, reaching 50 kiloamps #video mostly melting a bunch of metal things very rapidly
on 02024-05-18“giving personality to procedural animations (for #games) using math” illustrated using Manim. Reparameterizes a second-order ODE with natural frequency f, damping coefficient ζ, and response speed r, to get a conveniently controllable system, then integrates it with the semi-implicit Euler method, then analyzes the eigenvalues of the state transition matrix to ensure stability. #video #graphics
on 02024-05-18#Fraser makes a more powerful blow-tube lamp for glassworking #bootstrapping #video #toread
on 02024-05-18“What I learned” from using #Godot 3.x for 100 hours #video
on 02024-05-18#raytracing #graphics including #algorithms like resampled importance sampling, reservoir sampling, temporal reuse, spatial reuse, and #ReSTIR. Another very nice pure-CGI #video
on 02024-05-18#RMRRF DIY #EDM #machining #video #toread
on 02024-05-18terrain #mapgen for mountain #graphics with fractal Perlin noise and iq’s “gradient trick”, where you attenuate higher-frequency layers wherever the gradient of the lower-frequency layers is large; also, with diffusion-limited aggregation with a gradually increasing level of detail, and with “dual-filter blurring” #image-processing, where you alternate downsampling an image with blurring it, then alternate upsampling the result with blurring it, much like multiscale low-pass filtering with Hogenauer filters. Very nice pure-CGI #video.
on 02024-05-18#video demonstrating how to visualize #raycasting in #Godot #toread
on 02024-05-18#video touting “BAXEDM”’s DIY wire #EDM kit for #manufacturing parts with high #precision; getting his “location” fit (ISO H7/h6) for his M-shaped “shaft” requires +0/-16μm tolerance on the “shaft” and +25/-0μm on the hole, so you need about ±8μm precision. He’s using a 300μm nominal kerf width, shooting for ±10μm precision, using 15mm-thick cold-rolled 304 stainless plate. He got the “shaft” almost 10μm under the nominal dimension.
on 02024-05-17#video of #Rack-Robotics’s DIY wire #EDM #machining rig, including #manufacturing it with #3D-printing from carbon-fiber-filled PLA; the power supply here is their “Powercore V2”, which is 200 watts at 70 Vdc output with “up to” 90% efficiency for US$400. He uses a jug of distilled water from the store. He says the Powercore is “expecting a 1Ω resistance”, so it doesn’t shock him when he puts his hand in the circuit, though I notice he doesn’t connect it across his two hands. He says the wire’s outer coating is zinc, not tin as I had guessed. He says the water circulation is 100 “psi”, and it seems to be moving at a pretty good clip parallel to the wire. He touts ±100μm tolerances on the current revision, which sounds pretty shitty for wire EDM, and for the next revision they’re still only targeting 50μm, so they’re really trying for the rapid prototyping market here, not the traditional ultra-precision market of wire EDM. The motors (“hybrid” steppers) are kept out of the water, using only mechanical linkages to move the toolhead and tension the wire underneath the water. They dunk it in a 10-“gallon” aquarium to hold the water. They’ve moved to Colorado Springs and gotten funded. (This video is from this week.) 180 watts output at 5kHz implies 36 millijoules per spark, which implies about a 14μF output capacitor.
on 02024-05-17#video of #manufacturing a DIY wire #EDM for #machining; basically an ad for #Rack-Robotics’s (rackrobo.io) maybe-someday-open-source Wire Tool replacement hotend to turn any 24-volt 3-D printer into an EDM machine with 300μm brass wire, which looks silver, so maybe it’s tinned. Not sure how the filtration and feedback works, which seems like almost the most important part? He never mentions filtering. Also demonstrates hand-carving a 600μm aluminum plate with a 1.5mm brass rod electrode, which ought to be impossible because it should short out to the workpiece when you’re holding it in your hand, but actually it works fine. Gets up to 100mm/minute with the wire on the 600μm aluminum, or 20mm/minute in 3mm aluminum, while steel is 4½ times slower, while titanium is only 2–2½ times slower than aluminum. The power supply (“Powercore V1”) goes up to 72 volts, but the demo is all at 65 volts; he says the hard part is actually the power supply, which is “high voltage” (ha!), high power, 5000 Hz. This is at #rmrrf which I think is the Rocky Mountain RepRap Fest.
on 02024-05-17#video of a cop watching Breaking Bad #crime (waste of time)
on 02024-05-17#video of interrogation of an innocent person for #true-crime in 02003, 37-year-old Michael Dixon in Hamilton, Ontario, contrasted with an ex-con named “Justin” who was also innocent.
on 02024-05-17More on skinhead #Papini #video #true-crime #toread
on 02024-05-17#TPAI #video on #hoarding high-power junkyard stuff for #jugaad.
Loosely defined; Gerolf’s first “exciting find” is a 35kg transformer with a 200-amp secondary that’s only 5kVA because it’s 50Hz. Seems to be of E-I construction, so it could be a good source of electrical steel, not to mention high-ampacity copper, although his first step is to cut through the 6-kilogram 200-amp secondary with an angle grinder. His objective seems to be to make a kiloamp source for heavy welding, although I’d think a 200-amp secondary would be fine for that. He can’t usefully ohm out the primary because he doesn’t know about Kelvin connections, but he does succeed by measuring the inductances instead. He compares it to a couple of microwave-oven transformers, removing their secondaries and magnetic shunts to replace them with welding cables. 2½ turns on the small MOT can reach 395 amps. The larger MOT (also 2½ turns) reaches 649A. Another transformer he had lying around reaches 666A. 3½ turns on the 5kVA transformer exceeds 1kA, which is the limit of his clamp meter, so he got another one which measured 1200A.
This seems like high current but not high power; an inline-6 Mazda CX-90 is, by contrast, 16.6 horsepower, or 12.3kW, more than twice the rated power of this transformer, and presumably its actual output power is even less when you short-circuit its output through a wrench like this.
He also picked up a handheld spot welder (Dalex-Werke, 380VAC input, 9.2 kg, and various nameplate power ratings I don’t understand including 2.4, 6.1, 10, 2, and 20 kilowatts; I guess 7500 amps is the secondary short-circuit current and should not be multiplied by the nominal 2.3 volt output rating to get 20 kilowatts). He does get it to make some spot welds on razor blades.
He also found a component stereo system (Grundig RT 40 M tuner, Grundig SV 40 M amp, and Dual 1219 turntable) with a fake wooden façade; the tuner capacitor in the radio wasn’t even stuck, and both the radio and the amp from 01967 worked fine! He painted over the ugly fake woodgrain. He had to melt polymerized lubricant off the record player’s speed selection #mechanisms with a heat gun, then scrub it off with WD-40 and steel wool. Also the power switch doesn’t work, and he had to replace the pickup and the center pin. He explains the stroboscopic tachometer at 28'10".
on 02024-05-17#manufacturing snap-fits with #3D-printing #video by adding chamfers to widen the snaps at their bases, overextruding, using PETG or nylon, or printing on a 45° angle and rounding your bottom edges to prevent elephant-footing and diminish the overhang from printing on an angle, or printing on its side. Minnesota accent.
on 02024-05-16disturbing #video of #hoarding poop
on 02024-05-16making quantum dot #materials using olive oil as a solvent #video #toread
on 02024-05-16#video interview with serial killer Ed Kemper including discussion of his #crime #toread #true-crime
on 02024-05-15#video about skinhead Sherri Graeff #Papini’s #crime of faking her own kidnapping #true-crime
on 02024-05-15#BreakingTaps #video on small rolling-contact joints when ball bearings won’t fit. He holds the joint together with Dyneema tendons under tension (“Hercules” brand PE braided fishing line), rolling through the joint like a Jacob’s Ladder toy (magic tablets, Chinese blocks, Rubik’s Magic). He’s left channels in between the rolling contact surfaces to pass the fishing line through. So essentially the joint is sewn together.
on 02024-05-15#TPAI #video on #hoarding junkyard machinery #toread
on 02024-05-15Thayne Ormsby’s four-hour interrogation and confession of a triple murder #crime in 02010 killing Jeff Ryan, his teenaged friend Jason Dehann, and Jeff’s young son Jesse Ryan with a knife in Amity, Maine, edited into a 70-minute #video
on 02024-05-15#video on #electronics #hardware of a synchronous dc-dc converter by #GreatScott. First, for comparison, he rigs up a simple buck converter, whose switch is an IRF5305 p-MOSFET with its gate pulled up to Vcc (12V?) by a 100Ω resistor or down to ground by a BC547 with a 220Ω base resistor; the freewheel diode is a rather large 1N5822 Schottky (½W?), and the output capacitor after the hand-wound 100μH inductor is a 330μF electrolytic. The BC547’s base is driven by a knockoff Arduino Teensy generating an 80kHz PWM signal. So he replaces the freewheel diode with an IRFB3077 p-MOSFET to cut the power losses from 40mW at 400mA to about 0.4mW. To ensure dead time and avoid shoot-through, he drives the MOSFETs with an IR2184 half-bridge MOSFET driver chip and nine passives it apparently requires for its gate-drive network for some reason. He got 92% efficiency in CCM.
on 02024-05-15#video on testing fired-clay #ceramics and books for stopping hatchets and rubber bullets for armor
on 02024-05-15#video on the 02005 murder #crime of the Groene family in Idaho, except for 8-year-old Shasta, who talked murderer Joseph Duncan out of strangling her and then talked him into taking her to Denny’s in her hometown. She spent her teens imprisoned.
on 02024-05-15#video on how Randy Tundidor’s murder #crime was traced back to him because his brother Shawn betrayed him and his father to the police
on 02024-05-15#video finding fired-clay #ceramics are surprisingly good at stopping bullets for armor
on 02024-05-14#manufacturing folding furniture #video by woodworker #John-Malecki. This is the viral folding door and hyperboloid desk thing. Shows his frustration with a lot of the difficulties he ran into.
on 02024-05-14#styropyro #video on #materials made from a formulary from 01933. He got a visit from the FBI because he’d bought a lot of nitrates and perchlorates and stuff.
on 02024-05-14#Mikhail-Varshavski #video reacting to people getting injured and sick in wilderness survival shows
on 02024-05-14Adam Savage got his aluminum foil ball cut in half with a waterjet cutter. #video
on 02024-05-14harvesting #bamboo for food, including Phyllostachys aureosulcata and another one I don’t understand the name of. He boils the edible parts of his shoots, boils them, and dries them. #video
on 02024-05-14#manufacturing a toy sword from transparent plastic to make it “invisible”, using a disc sander progression and headlight polish. Sadly, he breaks his unbreakable sword at 14'36", but then uses it to break boards and bricks. #video
on 02024-05-13#manufacturing a slingshot #mechanical design to reach 84 joules #video
on 02024-05-13#video on why #Samyam doesn’t like writing #videogames in #Godot
on 02024-05-12#video on writing #games in #Godot, specifically a skeleton-themed home farming thing called “Living for Plants”
on 02024-05-12review of Tesla #Cybertruck in which its stainless skin successfully stops 9mm bullets, but two 9mm bullets in the same spot was enough to crack it. .17 HMR (700+ m/s) went through the skin, and an AR-15 round went right through the door. No slo-mo. #video #toread
on 02024-05-11review of Tesla #Cybertruck. It goes fast: 60 “mph” in 2.87s, 11.15 seconds for a quarter “mile”. They like the sound system, but found the four-wheel steering hard to steer. “It is absolutely weird and wonderful in its own kind of stupid and excessively flawed way. (...) can stop bullets and outpace a Lamborghini.” #video
on 02024-05-11there were 80 demoparties and 6000 prods in the #demoscene in 02023 #video
on 02024-05-11#manufacturing a plywood toy gun that makes noise #video #toread
on 02024-05-11#3D-printing #slide-rule #video #toread
on 02024-05-11Matt Chasen’s Hexa Lift #eVTOL 18-propeller 195-kg single-person #flying machine, actually flying. The batteries clip directly onto the motors. #mechanical #video
on 02024-05-11Halden calculator circular #slide-rule #video
on 02024-05-11cylindrical "Fuller calculator" #slide-rule uses a spiral scale with brass pointers (like using calipers to transfer a distance along a single linear scale) to calculate to five significant figures #video
on 02024-05-11supposedly history’s lightest tent, looks like a plastic bag #video #toread
on 02024-05-10#3D-printing a bandsaw #video. Really just the table, trunnion, and blade guides; the frame, wheels, motor, and blade are the same as before, made of wood or metal, and the PLA and PETG parts are held together with steel screws.
on 02024-05-10#hoarding #electronics #hardware #video #toread
on 02024-05-10Airwick fart neutralizer #electronics #hardware #video. He suspects it might be using a “tin oxide volatile organic compounds” sensor to see when to go off; a heating resistor heats a thin-film layer of doped tin oxide, and the “chosen” volatile organic compound lowers the resistance across the film. He wasn’t able to figure out much about it.
on 02024-05-10#bushcraft 14 months in the forest #video. He starts with a pickaxe and bedroll and dog and shovel and stuff, though. Saw, bowl, backpack, rope, bread, aluminum cooking pot, lanterns, sleeping bag, pliers, axe head, nylon line, etc. So he cuts a sapling as a handle for the axe, digs a 2-meter-deep hole in a clearing (breaking the pickaxe), and lines it with polyethylene sheeting and baling wire using fencing pliers, and pegs the polyethylene to the walls; I suspect this is a cistern. He delimbs more saplings with a machete, cuts them to length with the saw, and lashes them together with the wire into a lattice lid for the cistern. Then he hangs a second polyethylene sheet over it on four poles perforating its center so it will collect water for the cistern, weighting the center with a rock. Bandages the dog’s injured foot with a strip cut from his T-shirt with the machete, bifurcating the end of the strip to permit tying it tight. He clears a square on a slope with the shovel and uses some chalk from a dry wash to lay out a door on it; at this point I am getting skeptical about night not having fallen! Then he begins to dig terraces out of the rocky forest soil there with the pickaxe and shovel, uncovering a long-buried terra-cotta pot with gold chains, coins, and a ring in it. Poor pickaxe technique. As it begins to rain, he seeks out fragments of quartzite from the streambed, striking sparks from them. The camera cuts from him crushing one of them on a rock with the back of the axe in the middle of a cotton ball to a shot of striking already-ignited and charred cotton in the same way with the axe, a clear indication of #fraud, so I’m not going to watch the other 35 minutes of this video. In the comments he explains that he charged his phone with solar panels, which are never seen in the first 12 minutes of the video. There may be some interesting ideas here, but because of the fraud I have to say #plonk to “Ramiz in the wild”.
on 02024-05-10minimalist wilderness #scouting kit #video of 6–8 “pounds” in a fanny pack, plus some food in a “little foraging pouch” and a steel bottle of drinking water suitable for cooking in. Work gloves, emergency whistle with button compass and thermometer on a lanyard, a baseball-cap-clip-on headlamp with a long LED bar, Rite in the Rain notebook, ink pen, water sterilization tablets (one to kill, one to neutralize, materials unspecified), two hanks of army cosplay cord, emergency poncho, duct tape, survival space blanket, small first aid kit, another compass, two bandannas, mini binoculars, some sort of unspecified black plastic bag, fire kit containing matches and ferrocerium rod, and a couple of ziploc bags of unspecified tinder. He has a sheath knife hung around his neck, a Bahco folding wood saw in a pouch, and what looks like a huge French-style kitchen knife on his belt. This “Frontier” guy with 2100 survivors is annoying as hell because he keeps saying “There you have it” and “Boom”
on 02024-05-10paranoid propaganda #video #toread
on 02024-05-10blackout preparedness Amazon product shill #video. Walmart “Hypertough” plastic bucket, sort of like a cross between a typical plastic tote and a 20ℓ bucket. Square, a bit squat, strong enough to sit on, but “under 20 dollars” (so 4× the price of a 20ℓ bucket) and not hermetic like a 20ℓ bucket. Contents: Platypus water bags (empty); drinking water filtering system; three single-person-day ziploc “quart” bags of food (Clif bars, drink mixes (!? oh one is oral rehydration salts), sealed mylar Spam packet, instant coffee, “Nutrient Survival” brand dehydrated macaroni and cheese, dehydrated lasagne, dehydrated scrambled eggs, etc.); “Seattle Sports” brand rechargeable solar lantern that’s also a soft silicone water bottle; “Streamlight” brand three-AA-battery LED lantern with hanging clips; headlamp per family member; waterproof plastic box full of batteries and a Swiss Army Knife; hand-cranked weather/AM/FM radio with telescoping antenna that also takes AAA batteries and a solar cell and is a flashlight; USB power bank; multi-USB adaptor cable; camping pot which has a heatsink in the base and clips onto the stove; camping stove with “Jetboil” brand “Jetpower” butane/propane mix canister with 230g of fuel; silicone folding bowls (?!); “Ozark Trail” brand plates (?!); camping utensils (!??!); Walmart folding cups (silicone?); freeze-dried beef macaroni; sealed mylar packets of tuna. His excuse for all the dishes is that you might have to leave your house, so the bucket doubles as a “bug out bag”. Next to the bucket he has an “Allpowers” brand portable rechargeable-battery/inverter/outlet/USB-power/lighting combo machines, this one about the size of a car battery.
on 02024-05-10#video of demodulating AM #radio with a hot dog, or rather plasma to the antenna tower from a grounded hot dog
on 02024-05-09camping #video in the UK. Largely a review video for a big brown “cabin-style” tent with a fire-resistant mat where the wood stove goes. Hmm, this campfire in the middle of dry leaf litter seems ill-advised; he’s sawing firewood with his portable saw and splitting it with his camping knife. The folding camp table made out of tent poles is interesting. He demonstrated the TCES flameless ration heater used to cook a US MRE (powered by iron and magnesium). And then police were called — the week before, when he was cooking hotdogs in a fire pit with his dad, because a jogger saw them taking their shotgun out of the car into the woods. Their own woods! But not because of the cabin tent. #clickbait
on 02024-05-09#video of #microcontroller #hardware, the #Puya PY32 Cortex-M0, with #pricing of 10¢ in quantity 500. Over ten minutes of worthless talking-head footage at the beginning of the video. 5.5 volts, reprogrammable. Part numbers sound like STM32F0 clones? PY32F0032A is 24MHz, 20KiB Flash, 3KiB SRAM, 18 GPIOs, 1 ADC, 3 timers, SPI, UART, I²C; the 30¢ PY32F030 has, among other things, 32KiB Flash, 8KiB RAM, and 48MHz; the 50¢ PY32F072 even has CAN and USB. You have to get them off LCSC. He’s using Keil and programming it with an ST-Link v2, and some people use Stm32Cube. Screenshots of py32.org, which still has Puran’s documentation for their chips. He’s only able to get the code to flash at 3.3V. He recommends reading the STM32 manual to learn how to set up the ADC, so I guess this really is an #STM32 clone. (He points at ST copyright notices in the BSD-licensed HAL source code.) He also recommends reading Puya’s example code in the zip file and the well-written PY32F030 series reference manual in English.
on 02024-05-09#video of #gomezgimenez #manufacturing a solder-paste stencil for #electronics #hardware from an aluminum can. The cotton gloves for handling the aluminum are a good idea. He anneals it with a clothes iron on the high setting on a corkboard for 20 minutes, then removes the paint with acetone. First he tries photolithography with photoresist film. For a photomask he prints out three identical transparencies on a Brother laser printer and cyanoacrylate-glues them together. His UV source for exposing the photosensitive film is one of those nail-salon UV caves. 2% washing soda removes the unexposed film. Then he etches the aluminum with a commercial etchant of HCl and sodium persulfate (‽). To remove the exposed photoresist film and the inner epoxy liner of the Coca-Cola can he uses acetone. This produces somewhat uneven and rounded holes. Second, he tries milling with a “CNC 1419” desktop milling machine, using a 100μm conical milling cutter with a 30° included angle. His workholding is supergluing painter’s tape on the back of the aluminum to painter’s tape on a plywood spoilboard. (Stackup: plywood, stickum, paint backing, superglue, paint backing, stickum, aluminum can, air.) The calculated kerf is 207μm from the sum of the 100μm tip, the 200μm surface penetration, and the 30° included angle. FlatCAM ingests the Gerber and runs the mill. His cutting fluid is 3-in-1 oil. This one seems to be cut more precisely, though not quite as precisely as PCBWay’s laser-cut stainless stencil.
on 02024-05-09#video by #gomezgimenez on #manufacturing a digital clock that works by illuminating falling sand at 10Hz, all initially controlled by an Arduino (maybe a Mega, not sure), though later he got his own board fabbed with an onboard micro, looks like a PIC18F4550 actually, then soldered the parts down with a solder-paste stencil and hotplate reflow. Demonstrates some interesting #manufacturing techniques, such as CNC-routing a PCB with a D-bit with auto-bed-leveling sensed by conduction to the (coppper-clad) workpiece. Standard captive-nut technique for screwing together FDM 3-D prints and PCBs. Not sure why each digit requires 4 pixel columns of sand instead of 3. Because he’s modulating the timing of the sand release with the (16!) solenoids rather than the timing of the light flashes, he doesn’t have to worry about leakage of light between columns. Unfortunately you’d need a higher refresh rate than 10Hz for this to be practical; a 10Hz flicker is maximally distracting. Also the sand runs out in two minutes. #electronics #hardware
on 02024-05-09#electronics organ laser-cut from MDF and pink acrylic #video
on 02024-05-09Another #compressed-earth block #construction #mechanical machine #video, this one on “Verde Equipamentos” in Minas Gerais, with chamfers on 8 of the 12 cuboid edges and with hollow circular interlocking studs. No tongue and groove. This one is powered by muscle power with a toggle mechanism.
on 02024-05-09previous #video on #compressed-earth block #mechanical machine from Zhenting Machine, similar to #Blocco-Mattone machine. Ideally 10–15% portland, 30% clay. The AECT machine cost US$60k so they bought this US$5500 machine from Alibaba, “Eco Brava Burning Free Interlock” from “Shandong Weida Construction Machinery Co. Ltd.”.
on 02024-05-09another #video on a #mechanical machine from Zhenting Machine in China costing several thousand dollars for interlocking #compressed-earth blocks for #construction. It measures the soil into the compression chamber, makes two bricks at a time, leaves hollow spaces in the bricks, and uses a hydraulic press for the compression the ejection, which is through an openable mold top like the #Blocco-Mattone machine. Although the compression work is done by a motor, the rest of the machine’s action is manual; the operator must run through a sequence of actions to make two bricks, taking about a minute — but preparing dirt is the bottleneck. The vertical and some horizontal corners of the bricks are chamfered, as are the interlocking studs, which are hollow. The horizontal corners on the ends of the brick are the ones which aren’t chamfered, an odd omission. They bought the 110VAC-powered model. (30 amps!!) Brick dimensions 300mm × 150mm × 115mm. 1½–2 buckets of dirt makes 6 bricks.
on 02024-05-09#video on a #mechanical machine called “Blocco Mattone”, designed by Professor Roberto Mattone, RIP, which produces #compressed-earth blocks with a Lego #construction-set appearance, but for real #construction. Two rounded studs with a lot of draft (10mm tall, 38.7mm radius at top, 39.8mm radius at base) are on top of each brick, fitting into much deeper hollows in the bottom, and there’s a tongue at one end (15mm long, 40mm wide at tip, 56mm wide at base, due to the generous draft angle) and a corresponding groove at the other. There are no chamfers on the faces of the brick. The main rectangular body of the brick is 280mm × 140mm × 95mm. The stud centers are 71.5mm from the ends of the main rectangular body, and I don’t know how that’s supposed to work, since the studs in a course of bricks ought to be equidistant; maybe the hollows are larger to allow some slop. Organic material and gravel must be removed by “sieving” (riddling, I suppose; a window screen is shown being used). 6–12% portland cement. The brick press is muscle-powered; it uses a “floating mold” which can move upwards against the fixed die along with the soil within it as the movable die is pressed into it from below. A cam mechanism gradually increases the mechanical advantage toward the end of the stroke so that from 300N input force it can produce 80kN (which works out to, surprisingly, only 2MPa). By pivoting the whole mechanism onto a different cam follower, a second cam ejects the block from the top of the mold. He demonstrates a three-point bending test for fully cured blocks. I’m not a big fan of the expensive precision cylindrical movement joint used by this design, especially in an environment with sand. But I really like the idea of the interlocking blocks.
on 02024-05-09#compressed-earth block #construction #video using #mechanical hydraulic cylinders to apply 1800 “pounds per square inch” (12MPa). Discusses screening (riddling?), mixing the soil with a farm-tractor-mounted rototiller, mixing in 10% portland cement, discovering you don’t have enough clay (he recommends 40% clay), making sure there’s no organics, etc. This machine (make, model, and pricing not specified) doesn’t seem to make chamfers or interlocking features.
on 02024-05-09#video on muscle-powered #mechanical cement-stabilized compressed soil brick #construction machine by Makiga Engineering Services of #Kenya, designed to make interlocking blocks that are stable even without mortar (though, I’d think, a bit fragile), at a rate of about one per minute with four workers. Costs 122 thousand shillings. The outside of the bricks do have beveled (chamfers) corners, but their interlocking features lack not just chamfers but even draft. #compressed-earth
on 02024-05-09#bushcraft stone house #video continued. He seems to have given up on arches at some point; the final window is sort of a corbelled arch, and the doorway appears to be unashamedly topped with a rather slender wood lintel. And the roof, rather than being any sort of arch or stone, is evidently corrugated sheet metal (or actually fiberboard composite?) laid over wooden poles, posing the question of why he doesn’t use glass in the windows. In this video he’s mostly adding adobe mortar and stone to chink up the gaps. #construction
on 02024-05-09#bushcraft stone house #video; not sure these adobe-mortared stone arches are really safe, especially since his adobe seems to have far too much expansive clay in it, judging by the cracks. What happens when it rains, and the wind wets one side of the building more than the other? Where did he get all those nice angular blocks of limestone of a consistent thickness? Why do I never see him use a plumb line? He uses a pair of supple saplings bent into an arch shape for his “centring” — but then never strikes it, instead plastering it with adobe. Then just in case he puts a big wood lintel over the top of the arch so it doesn’t have to bear any weight. #construction
on 02024-05-09another #video, by #randomtronic, of the #electronics #hardware in a 1.5kV #flyswatter. From a distance it looks like the same design as the contemporary bigclive video, but he has the transformer’s primary winding on its collector as you’d expect — but with a series resistor, which you wouldn’t. And only 7.2MΩ of bleeder resistance, and a slightly different voltage multiplier design, which he describes as “confusing as hell”. He is also skeptical of the transistor pinout he got from the datasheet, so he plugged it into his TransistorTester and found that the terminals were backwards. But the primary of the transformer is still on the transistor’s emitter, as in bigclive’s analysis, rather than its collector. His understanding of how the Joule Thief works is the same as mine and different from the explanation given by bigclive in the previous video, with the current switched by transistor turning it off rather than further on.
on 02024-05-09older #bigclive #video on the #electronics #hardware in an electric #flyswatter, labeled as 1.5kV. It uses a (slightly weird) Cockcroft–Walton voltage multiplier on the transistor output, terminating in an 0.022μF kV cap with a 44MΩ bleeder, and has the primary side of the transformer on the (8050SS) transistor’s emitter (!) rather than its collector but otherwise a similar circuit to the later video.
on 02024-05-09#bigclive #video on the #electronics #hardware in an electric #flyswatter. The circuit is extremely simple! A transformer, a transistor (C2328A 30V 2A 1W), a 560Ω resistor, a diode, an 0.33μF 630V film storage capacitor, a 2.2MΩ bleeder resistor for it, and a probably unnecessary LED (with its own 560Ω resistor) and power button. It all runs off 3 volts from two AAs. It’s a blocking oscillator, basically a Joule Thief with a high-voltage secondary which is half-wave rectified into the storage cap; the resistor limits the current into the base of the transistor. Although I think I may have misunderstood how the Joule Thief works — he says the feedback winding turns the transistor on more until the core saturates, at which point it starts turning off. The two primary-side windings attached to the transistor are 1.5Ω each, and the high-voltage secondary is 150Ω. A commenter says his is 1500V, and he altered the output to 1μF 10MΩ for a “nice loud bang”.
on 02024-05-09#vanlife #video in Rosa’s 2009 #Honda-Element car named Elrond with a Sodastream. A 7-gallon jug of water was inconveniently heavy; her “build” was under US$200, and she’s been living in it for six years plus US$11250 for the car. She cooks on a Coleman 2-burner stove on the tailgate. “My entire conversion is actually held into my car using zipties.” She built it out of plywood from Home Depot and piano hinges. The interior is too small to stand up in, but the car is pretty boxy and voluminous for being a car, and it's 4WD, so like halfway to being an SUV. Also the rear doors are backwards-opening “suicide doors”, so you get a double-door effect. She uses aluminized bubblewrap windowshades with blackout curtain taped to the outside with black duct tape, which she says blends in better from the outside. Rear windows are tinted, which would make the blackout hard to see from the outside. She showers at Planet Fitness. Stores water (two 1-“gallon” bottles) and a tarp and a folding chair in the passenger footwell, and a backpack on the seat, so someone looking in through the non-tinted forward windows would see that the car is being lived in. But she hasn’t made any modifications to the outside of the car, so there are no solar panels, shore power, stove chimneys, etc. To work on her laptop she goes to cafés, libraries, and Whole Foods (“really great Wi-Fi”). On the road for the first few years, she worked seasonal jobs at national parks and resort towns, and Subway and similar chain restaurants. Then, when Covid hit, DoorDash, InstaCart, etc., and now she’s a YouTuber (“#lifeoutofmyelement”). She feels like roof racks or stickers are not good for stealth camping.
on 02024-05-08#video #Cesar about #hoarding and recycling TVs and monitors. Magnet wire from the CRT yoke, 0.4mm diameter in one case; a ferrite core which works well as a microwave susceptor; a 40MΩ potentiometer; power transistors; the flyback transformer for high-voltage supplies; a 2-digit 7-segment LED display; an IR phototransistor; electrolytic capacitors; high-voltage ceramic capacitors; switches; clock crystals. He disassembles the CRT to show its parts; he suggests using the shadow mask as a fine mesh screen, and harvests the phosphor from the inside of the screen with a paintbrush, then dissolves the aluminum it’s mixed with using lye. #hardware #electronics
on 02024-05-08#video #Cesar about #hoarding cigarette lighters. Demonstrates making a tiny “Bunsen burner” out of the nozzle by brazing a drilled bolt onto some tubing, then epoxying the nozzle (flow restrictor removed) into it with 10' Poxipol. Then he epoxies a 100mm aluminum tube to a nut, then drills a couple of air inlets into the aluminum tube, but never gets a decent premixed flame. To get a solid base, he fills a Nutella lid with plaster. Demonstrates using the striker wheel (hardened steel) as a dremel cutting wheel for engraving glass by peening the tip of a cut-down nail over it. Demonstrates using the tiny aluminum tubes as cold-peening rivets by hammering a conical expander mandrel into them. Demonstrates depositing ferrocerium shavings onto a paper towel and burning it.
on 02024-05-08#video #hardware #electronics US$10 #calculators as of last year apparently run Android 9 (Pie) with multitouch screens? This “GHLBD” brand four-function calculator has a gigabyte of RAM, a 32-bit quad-core Allwinner A50 507 CPU (1512MHz Cortex-A7), 3+ gigs of Flash, and a 2700mAh LiPo battery. So this wild hacker installed bunch of #retrocomputing N64 #games in an emulator. Doom 3 runs at 16–32 fps.
on 02024-05-08#video #toread on how to “make” #ceramics clay from dirt
on 02024-05-08#video 183 wpm steno typing test. Pretty impressive. Using “The #Uni” custom steno keyboard.
on 02024-05-08#video #toread about #mechanical spherical parallel manipulator
on 02024-05-08#video #toread about #manufacturing a simple DIY #ozone generator
on 02024-05-08#video #mechanical hammer reinvented, but badly. The "Hammerfist" is more like driving a nail with brass knuckles, 366-gram brass knuckles which transmit the impact directly into your hand. Apparently it’s easier for kids though.
on 02024-05-08#video #toread #Argentina probably some kind of anti-woke dreck
on 02024-05-08#video on “African-made drones”, deleted (taken private) before I could watch it.
on 02024-05-08#video #toread on “Steampunk crab monsters” #todelete
on 02024-05-08#video on the "SharpiKeeBo" which looks like maybe it uses a #memory-LCD?
on 02024-05-08#video on telephone #decentralization with apparently some newly available mesh networking firmware, "Meshtastic" #radio running on #ESP32 hardware: encrypted text-based walkie-talkies using #LoRa on the Heltec WiFi_LoRa_32_V3 board, which has an ESP32-S3FN8 on board. Not low-power, though; half a watt idle! And the firmware is built on PlatformIO. You can flash it via #WebUSB on flasher.meshtastic.org. But it depends on a custom app on your cellphone for its UI, to which it communicates over Bluetooth (or USB serial or Wi-Fi), because the actual board only has two buttons, though it does have a respectable OLED screen which displays incoming text messages. It also needs the cellphone if you’re going to give it GPS. You can also use a browser app which uses your Wi-Fi or Bluetooth to talk to your local devices. The YouTuber reports he got messages through (spottily) at 5km from his 32nd-floor highrise balcony, using the 90-bits-per-second data rate, but at ground level at the beach, only about 150 meters of range, which he blames on the antenna. It can share private keys over QR codes to set up an encrypted channel, but by default doesn’t.
#video on the best of #Playdate #memory-LCD #games suggesting something called “P-Racing”
on 02024-05-08#video on #Ficihp “keyboard” with touchscreen #toread
on 02024-05-08#Playdate #video with some playthrough videos of new (late 02023) #memory-LCD #games, or so I thought, but it seems like it’s mostly footage of the fucking Playdate website. Eight minutes in we get a playthrough of Taxi Trouble, a 2-D game, which seems to use just three stipples: black, white, and grey. Then Shift, a 2-D matching-pieces-disappearing puzzle game, etc. No actual footage of the screen apparently. I didn’t finish watching.
on 02024-05-08two-minute #Playdate #video of new Catalog #games for March 02024. Lots of interesting monochrome 1-bit UI idiom experiments on the #memory-LCD.
on 02024-05-08“amazing new OS” "C64OS" for the #Commodore 64 #video #retrocomputing #toread
on 02024-05-08Nicolas Magnier #video of video on a #memory-LCD. 60fps on the 400×240 SHARP memory-in-pixel LCD. #displays
on 02024-05-07slo-mo #video of #expanding-grout breaking up a boulder
on 02024-05-04#video on modern reconstruction of 01930s hobo “everyday carry” pack: gum blanket/rubber poncho, shelter half, wool blanket, wool socks, etc. Probably not worth summarizing.
on 02024-05-03#video on a nice #vanlife conversion for about US$900: 12-volt chest fridge (US$250), furniture from scrap wood or modified thrift-shop goods, metal bed frame off Craigslist, mattress (US$300), blackout curtains for #stealth-camping, custom insulation panels fit to (“ceramic” tinted) windows, 4 100W “Renogy” #photovoltaic #solar panels for #energy feeding two 100Ah LiFePO₄ batteries under the bed, no inverter, “shore power”, dc-to-dc charger for when driving, one-burner camping stove, 12-volt electric blanket, fuse panel under bed, smoke detector and carbon monoxide detector, “Renogy Rover” 40A charge controller. I think he’s maybe forgetting a lot of the costs and the real cost is a lot higher. USB fans for ventilation. Diesel space heater hooked up to a gas can screwed to the back door. Indiana plate C843CA. Two fire extinguishers. No toilet, uses public restrooms, bucket for emergencies. Showers at Planet Fitness, friends’, and truck stops.
on 02024-05-03#video on flashlight #fraud on #Amazon
on 02024-05-03#Nighthawk #video about waterproofing fabric #materials making oilcloth by ironing cubes of paraffin wax plasticized with mineral oil (paraffin oil, vaseline, ideally about 500mℓ per 2kg of wax) into the fabric. This seems dramatically inferior to the naphtha-thinned silicone recipe he showed previously. Contains some of the usual backwards science of Nighthawk videos; here he claims that the thermal coefficient of expansion of steel is greater than that of paraffin wax, for example, and that naphtha and gasoline are carcinogenic. For his jacket he ended up applying it as a paste wax, like to floors, but melting it with a heat gun instead of kerosene. Unrelatedly, he also demonstrates tying a slipknot (a taut-line hitch) around an acorn wrapped in the corner of his tarp in place of a tiedown grommet. Commenters advise that the wax needs to be reapplied every year; that you can filter lubricating oil out of camp fuel with nonwoven polypropylene to get naphtha; that the Hartford Circus Fire was caused by waxed fabric; and that adding about 6% by mass wood ash to the wax improves durability.
on 02024-05-03#CodysLab #video on #expanding-grout. He uses quicklime (not slaked lime like “Dexpan”!) and, to delay the reaction, washing soda (200mg or 600mg per 10g of quicklime). Features a quicklime steam explosion in the kitchen. He sinters the quicklime to try to reduce its porosity, which I didn’t think will do much because his kiln was only set for 1200°, but apparently it did. The mix was successful in breaking a rock in a couple of hours and a test tube in a bit more. The higher-soda mix expanded more (possibly because it stayed wet longer) but more slowly.
on 02024-05-03#video with a three-minute segment about #card-catalogs
on 02024-05-03two-minute #video about #card-catalogs
on 02024-05-03#vanlife #argentina #video #Al-Mundo-con-el-Mate #clickbait pretending to give up again, but it turns out they just had to go back to their hometown to renew a driver’s license and the verificación técnica of the van. They say the Axion stations are better than the YPF stations for spending the night, and often have picnic areas; in the south, near El Bolsón, there are more places where you can’t spend the night because they’re overloaded with motor homes. Lots of footage of driving down the highway
on 02024-05-03another #video on #machining a #mechanical Frisbee launcher for disc golf
on 02024-05-02#StuffMadeHere #video on #machining a #mechanical 90 “miles per hour” Frisbee launcher for disc golf.
on 02024-05-02#video on #machining #mechanical worm gears on a lathe with a homemade gear hob
on 02024-05-02#3D-printing #mechanical worm gears (though for some reason single-throated) and running them with no load and with or without grease. They melt at 8000 rpm when run without grease, but survive at least ten minutes at 12000 rpm with an unspecified grease. Printing the worms on a 45° angle with some support material works better than horizontal or vertical. #video
on 02024-05-02new #Nixie-tube #machining #video #toread
on 02024-05-01#vanlife toilets #video considering cassette toilets and blackwater tanks. Finally at the end of the video he talks about composting toilets. Mentions the risk of thousands of bugs hatching in your composting-toilet medium overnight, something I hadn’t heard of (but apparently happened to a friend of his).
on 02024-05-01#stealth-camping #vanlife #video of an old woman #toread
on 02024-05-01#vanlife #video of UCLA med school student Ethan, who did a US$14k conversion of a “2015 Ford Transit”. To save money, in his van (California 9GQK477) he has two gas burners (with electric ignition), a double bed (parallel to the back door), drawers, cabinets, bookshelves, sink with restaurant-style sprayer partly blocking the sliding door, all inside a van tall enough to stand up in. Behind the butcher-block countertop and stove is real ceramic tile (6 rows, 9 per row in running-bond pattern, 75¢ each). A US$900 “Indel B” CR130 130ℓ 72W truck fridge, using 60 grams of R134a, is under the counter which he cut down from a US$300 8-“foot” slab. Curtain hung between cab and living space. Insulating opaque panels cover the windows, giving the false appearance of a dark window tint. Warm-white LED lights shine down from the knotty pine ceiling and from the bottoms of kitchen cabinets. Floor seems to be tongue-and-groove “Home Decorators Collection” brand plastic laminate fake wood laid directly over plywood over foam, with no foam over the plywood. Nothing is visible from the left or right side or rear of the van, except that there are two domed skylights/roof vents, which is slightly unusual, and two small added sliding windows near the rear. With more attention, or from above the van, you might notice the three solar panels on top. Therefore, this qualifies as deep #stealth-camping, as long as all the doors are closed, but sometimes he hangs out downtown with the sliding door and curtains wide open. The bed, really a US$50 memory-foam mattress topper, is at the back of the van with ample storage space underneath, accessible through rear doors, including a bicycle, stored with its front wheel taken off, and the 200Ah battery, 1000W inverter, and charge controllers (dc-dc from the van’s alternator, and solar). Fridge, fans, lights, water pump, and propane-valve solenoid are all 12V. Two bench seats between the bed and kitchen, exactly like Al Mundo Con el Mate. The front seats swivel back to provide more seating, and there are opaque panels to put in the (untinted) cab windows and windshield too. 120VAC sockets in the wall. Walls and ceiling of pine screwed to thin studs, with thin flexible foam insulation behind the wood. Very minimalist IKEA vibe. The sink water is pumped (with an electric water pump he must manually turn on with a lightswitch inside the sink cabinet) from two 7-“gallon” water tanks which have dual carrying handles, similar to what we used to take to Burning Man, so they can be refilled away from the van, in a friend’s bathtub every week or two (since they won’t fit into a sink). There’s a dish drainer in the bottom of the sink. He says the water hookup took hours and hours and hours at Home Despot and Lowe’s. One of the roof vents has a working fan. One bench seat has the 5-“gallon” propane canister and its regulators and valves, and also his pants and shoes. The bench seats and drawers are butt-joint plywood construction, painted white, with dado joints for the drawer bottoms (though he calls it “dodo”); the bed and sink also seem to be plywood, but with stringers at joints. No regularly used toilet, just a pee jar, plus a folding toddler potty for emergencies that takes a bag, which looks much smaller than any #composting-toilet I’ve seen. He reports he can stay parked in one spot until Friday street cleaning. He and his dad spent two months at the family farm in New Jersey converting the van. The video also shows his friend Justin’s van, with similar screwed-pine construction and a somewhat similar partly-blocked-sliding-door layout, but a wall and pocket door between the living space and cab, and with a shower and bathroom. Justin has the cutting-board top for the sink that Ethan lacks, as well as a three-burner stove, an oven, a floating Lagoon-style table, a fridge under the bed. Then they show the van of another friend; I’m getting overwhelmed.
on 02024-05-01#Stories-from-a-Van guide to living in a car to save money. Recommends 5%-transmissivity blackout limo tint for rear car windows and curtains hung behind the front seats. Recommends parking on busy streets, in residential neighborhoods with apartment complexes where other unfamiliar cars regularly park, but never parking in front of a house, instead parking next to open spaces or churches or public buildings, or in the overnight parking lot of a train or bus station. In San Francisco he would exit his minivan through the driver side door to go to the gym to work out and shower. But he was wasting US$800+ per month on eating out. He suggests using a UPS Store or similar “CMRA” mailbox address. #video #vanlife
on 02024-05-01one of the last gun factories in Kashmir #machining #video. Basically #India’s #gun-control wiped out the industry
on 02024-05-01#clickbait #video on “turning a truck into weapons with the Mayans” #toread #machining
on 02024-05-01#HTME #video on making glass #materials #toread
on 02024-05-01#HTME #video on #bootstrapping rubber #materials from wildflowers, specifically native Minnesota goldenrod. Dried, pulverized in a blender, Soxhlet (?) reflux extraction of unwanted compounds with acetone, then solvent extraction of polyisoprene in toluene. For scaling up, improvised a reflux apparatus out of paint cans, glass tubes, and silicone caulk. Got about 3% of the mass of the dried leaves as rubber goo. Then they vulcanized the raw rubber with sulfur in a toaster oven.
on 02024-05-01black oxide coating of fasteners #video #toread #machining
on 02024-05-01#Philippines #gun-control and gun culture #toread #video
on 02024-05-01#vanlife #video of camper bed designs #toread
on 02024-05-01another super low budget #vanlife #video, this time from the #USA: a PVC pipe frame and a silver Harbor Freight tarp over a Chevy pickup bed, with some rubber mats in the bed, which also contains a couple of ice chests, a portable generator, an air compressor, some gas cans, a toolbox, some nylon strap tiedowns, and a plastic tote. But they didn’t actually succeed in sleeping in the bed because their bedding got soaked in the tent before they even got it set up, so they went to a hotel. After they got back home they did tie the tarp down with some ropes and it looks pretty okay.
on 02024-05-01marketing #video of IBM VM/CMS from 01975 #history
on 02024-05-01#video by #Alyssa-Vanilla about giving up #vanlife due to migraines, copper IUD problems, and other health problems. A cold, windy hike kicked her ass back to Love’s Truck Stop. Lots of footage of hiking around in the desert.
on 02024-05-01#vanlife #video about a minivan conversion by "Alyssa Vanilla", whose video about being stalked went viral. Stained plywood and painted pine boxes screwed together on stringers and hinges with leather handles, with a yoga mat on top of a box as a bed, plus some open-cell foam as a mattress, cut to size with an electric kitchen knife. PVA glue to attach wood trim on the outside of furniture. Flooring seems to be prefab tongue-and-groove (?) laminate (?) paneling with pressure-sensitive adhesive on the back, laid over painted plywood (?) on top of insulation foam. Very IKEA look. Wicker baskets under the bed work as very lightweight drawers. No toilet, no stove, no fridge, no electrical, no air conditioning, no sink.
on 02024-05-01#Al-Mundo-con-el-Mate #video #vanlife about the electrical setup in their van. They use a US$350 “Daza” brand “pure-sine-wave” 1500-watt inverter which consumes 33 watts when idle, mostly to charge their laptops, and had to replace one of its MOSFETs at one point (though he misleadingly displays a 2N2222 at this point in the video), which was a huge problem because the particular US$5 transistor model was unavailable in #Argentina. (A commenter says he overpaid for the big inverter.) So he replaced it temporarily with a small 300W modified-square-wave inverter which “only” consumes 3 watts idle. The electrics boxes (built under one of their bench seats) are wooden, which I don’t think much of. Their #photovoltaic #solar panels are 380 watts peak, which is all they had space for on top of the Sprinter. The solar panels connect to an “Epever” brand 30-amp MPPT charge controller, and then they have a ridiculous 6-breaker 240VAC panel through which they’re running their 12-volt power (because 240-VAC breakers are much cheaper than 12-VDC breakers, like US$35 each?), plus some car fuses. He’s still confused about the difference between amps and amp-hours, again incorrectly describing his 2500-amp 275-amp-hour (each) gel batteries (GreensunSolar JFM275-12 if the photo he showed in a previous video isn’t fake news) as “275 amperes”. Again he shows the “Aleba” BC-1240 40-amp battery charger they use to charge from “shore power”. They chose lead-acid batteries instead of lithium so they could afford them without selling the van, although I think probably they could have gone with a much-lower-capacity battery, which he seems to agree with. One time he forgot he was charging the house batteries from the van’s starter battery (he has a switch) and drained it halfway.
on 02024-05-01#video about paperclip paddles for Morse code, hooked up to an iambic keyer; three jumbo paper clips, bent to shape with needlenose pliers, are screwed into a wooden block that the cable is stapled to. The nickel or chrome plating on the paper clips has kept them from oxidizing in storage. #electronics #hardware
on 02024-05-01#stealth-camping #vanlife #video from Cheri, a woman in late middle age. The US$120k van, Mungu Bariki, is an RV conversion by Embassy RV, which puts in air vents that don’t look very air-vent-ish for added stealth. There’s a rear-view camera, a plugin on the side, and some inconspicuous tubes hanging down. But the license plate is a Wisconsin motor home license plate: D L4376, and the Embassy logo is on the back door. She uses a rather large “Sea Head” brand composting toilet hidden under the bathroom vanity, which swings up; the toilet uses hemp bedding and a poop-stirring crank. A “Premier” brand 12-volt air conditioner protrudes from the top. Standard ground clearance (rather than lifted), no solar panels. A 32-inch flat-panel TV swings down from the ceiling. The air conditioner is rather noisy. The interior is all plastic, vinyl upholstery, and steel structural tubing, no wood. Cutting board with a hole in the middle covers the kitchen sink. Touchscreen control panels for the lights and stuff. There’s a DVD player mounted on one side, a microwave above the sink (running off a 110VAC inverter), and an induction burner for cooking. The space heating burns the van’s gasoline. The fridge is a Nova Cool model, almost full height, mounted near the ceiling.
on 02024-05-01#vanlife #video about problems she encountered in France: locked herself out of her van from paranoia, lost her credit card, had the diesel space heater break down in the middle of the winter (using a hot-water bottle and wishing for an electric blanket as backup), had the sliding door break stuck open (terrible in midwinter), one of her headlights broke, she sliced her leg open on the cabinet handles inside the van, she slipped on some ice at a historical monument and fell and hurt her collarbone and shoulder, and finally got attacked by a dog, though it didn’t break the skin; basically her vacation in France sucked shit. She’s using a rechargeable battery pack with a built-in inverter that she’s being paid to shill.
on 02024-05-01#vanlife #video about toilets. She didn’t like the “Bivvy Loo” or the “female urinal”, but did like the “Trelino” brand “Evo” separating toilet she’s being paid to shill, described as a #composting-toilet, even better than the “Nature’s Head” brand she’d used previously. One of the things she likes is that it doesn’t look “as much like a toilet” because it’s square and dark gray. It kind of looks like an ice chest, with finger notches near the bottom, and it has a dashpot soft closing mechanism. The pee bottle has a sort of soft funnel membrane which lets pee go down but without remaining open for gas exchange when there’s no pee, sort of like a check valve. She mentions a bag or liner for the poop bucket, as well as a “carbon-rich cover material” such as sawdust; other alternatives are organic cat litter, fine bark mulch, peat moss, or coconut bricks. And she rinses the pee funnel with dilute vinegar and wipes it with “a tissue”. For carrying the poop bucket and pee bottle at a campsite, she has a bright yellow reusable shopping bag so it doesn’t look like she’s carrying a poop bucket and pee bottle. She prefers the composting toilet to chemical cassette toilets, because it’s easier to clean and requires less maintenance, among other things.
on 02024-05-01#stealth-camping #video in a hammock in a green space along a foot trail between two neighborhoods in, I don’t know, Edmonton, Alberta, or something, “disguised” as businessman in a thrift-store sports coat, with all the camping gear packed into a naugahyde suitcase that vaguely resembles a briefcase from enough of a distance. Almost out of sight of the trail, about 30 seconds’ walk away, he strings up the dark green hammock between two trees with a tarp over the top, some time before nightfall because of an incoming thunderstorm. With the tarp and hammock, he reports being “bone-dry” despite the heavy rain. He has some kind of butane-powered insect repellent, which he then switches to a butane camp stove to roast hot dogs over on a telescoping fork, and then zips a mosquito net onto the hammock for sleeping.
on 02024-05-01#Al-Mundo-con-el-Mate #Argentina #vanlife #video #toread
on 02024-05-01#Al-Mundo-con-el-Mate #Argentina #vanlife #video #toread
on 02024-05-01#Al-Mundo-con-el-Mate #Argentina #vanlife #video #toread
on 02024-05-01#Al-Mundo-con-el-Mate #Argentina #vanlife #video in Posadas. Giant Andrés Guacurarí statue. International Bridge to Encarnación, Paraguay. Beach. 30° hellish heat (posted 02023-09-07, but probably several days earlier). There’s a place reserved exclusively for parking motor homes. They spent a day on their laptops in the van, in separate spaces, during a rainy day. A bit dull.
on 02024-05-01#Al-Mundo-con-el-Mate #Argentina #vanlife #video of being “EXPELLED” from Salto Encantado park in Misiones. Mostly they went camping and swimming in the 5° waterfall and played with a dog, made some food, worked on their laptops, etc. Micaela took an afternoon nap on a blanket on the greensward. But apparently the reason they got EXPELLED was that they asked a park ranger if they could spend the night parked in the park parking lot, and he had to ask his boss, and finally they were told to park across the street. They just drove to a YPF station to park for the night so they would have internet access, then returned the next day.
on 02024-05-01#video #drvelazquez and Martu are taking a break from #vanlife and renting a house because for days it hasn’t stopped raining and snowing in San Martín de los Andes, and everything in their pickup truck bed got wet! Their “snorkel” system didn’t work as expected. #DRAINAGE
on 02024-05-01#drvelazquez #video explaining that they use the showers and bathrooms in campgrounds and service stations and hostels and hotels because their #vanlife has no bathroom in the actual truck, and they get 8–10km per liter of fuel (19–24 “mpg”), with an 80ℓ tank. 1.5m² of living space, like living in a tent, with a bed occupying 120cm × 190cm when open. They’ve started using a 6ℓ water bottle as a graywater tank. They’re spending about US$30 per day between the two of them, which seems pretty expensive for #Argentina.
on 02024-05-01Martu and Colo/Gonza (#drvelazquez) live in #Argentina in Martu’s grandfather’s 01994 Ford F100 pickup, with a truck bed cap (“cúpula”). There’s a couch which unfolds into a bed, woodgrain wallpaper, a 12-volt-pumped kitchen sink draining through plastic accordion pipe out the tailgate onto the ground, mounted in a wooden counter painted white, a couple of ultralight portable camping stove burners on the counter (which run off the little spray-paint-sized butane cans), a polyethylene carboy (bidón) of water. The couch/bed bed is apparently two pieces of particle board hinged together so they can unfold to twice the couch’s width, extending up to the counter and eliminating the floor space, presumably supported on parts of the cabinets. Underneath the bed, which seems to be made of 19mm particleboard screwed together at butt joints, is the clothing. There’s enough headroom to kneel when the bed is folded up to expose the floor. The kitchen counter has curtains on cables which slide open to reveal the dishes, foods, shampoo, tiny fire extinguisher, etc. No bathroom, no graywater tank, and I think not even privacy curtains or air conditioning. They have rolls of aluminized polyethylene foam instead of privacy curtains. The water pump and LED lighting are powered by one of those little gel batteries used in motor scooters or home security systems, which they say came from a UPS, and which they recharge with a car battery charger when they can plug in, or just by hooking it up to a cigarette-lighter socket hooked up to the truck’s starter battery, without even a diode. They also use this for a USB charger. When parked they can use a jack to raise the truck bed cap to make enough space to almost stand up in, with vinyl fabric filling up the space. The furniture is built from wood they found in the street, including discarded broken furniture. They’re trying to survive by selling Colo’s book, “Vendo Todo: Me Voy a la Mierda”, author Gonzalo Velázquez. This is the lowest-budget #vanlife #video I’ve seen yet.
on 02024-05-01#video on Luis’s #vanlife in #Argentina in his 01957 jeep (?) Simona, license plate XCK 003, nickname Estenopo Viajero, which has two gas burners to cook on (powered by a 3kg propane bottle, of which he’d used 500g after 6 months cooking on it), a box for a bed, some cabinets over and under the sink, all made apparently of 19mm particle board framed with welded square steel structural tubing, cheap hinges screwed into the cabinet doors, and curtains hung in the windows. Not quite tall enough to stand up in, with a wood ceiling. No bathroom. He plans to set it up as a mobile darkroom; his old enlarger is installed already. 1.5m² of floor. The water tank to feed the sink is in the rooftop rack, connected through garden hoses, and is just a long piece of (150mm?) PVC pipe. Kitchen things are in a milk crate in the over-sink cabinet, like a drawer. Very rudimentary but seems reliable. The passenger seat folds up and forward to expand the space behind.
on 02024-05-01#video on problems/regrets #Al-Mundo-con-el-Mate had with their #vanlife build: shower drainage when they’re not parked on level ground, the vinyl flooring on the bathroom walls (because there are places where it isn’t really stuck down), the bathroom accordion door tearing up the vinyl floor, not having space heating, putting the stove in the middle of the door (because the wind can blow out the fire), not having a place to sit next to each other and watch a movie, and not having a desk in the cockpit (which he evidently later added). However, having the air conditioner panel straight over the bed is a big win.
on 02024-05-01#Al-Mundo-con-el-Mate gave up on #vanlife according to the title of this #video, buying a house in El Calafate, but it’s a #clickbait lie; they’re just hanging out at a friend’s house. There was reserved motorhome parking made a good impression on them, but it costs $9000 per 2 kg for milanesa de pollo, and they had to spend the night at the YPF station. Every single motor home in the YPF parking lot has solar panels. This video also shows the storage accessible through the back doors where they have their 30-liter liquid fuel bottle. Apparently flying drones in national parks is forbidden. Mostly just a travel tourism video, bleh.
on 02024-05-01#vanlife #video of carpenter Daniel Metrailler (IG @callejer0s_viajer0s) from Caseros, Entre Ríos, who built a 1400kg wood-siding-covered trailer out of phenolic to live in with his three dogs, pulling it behind his 01974 Peugeot 404, license plate UQX 538. The trailer’s brakes are activated by compression into the car, and it has a 6ℓ hot-water heater on the front of it. On top it has two 110-watt #photovoltaic #solar panels for electrical #energy and a “100 ampere” (probably erroneous) battery. The sides of the trailer have architectural-salvage windows with screens, so it’s about as far from a stealth-camping trailer as can be. The interior furnishings (drawers, cabinets, kitchen countertop) appear to be wood. He’s removed the stove he used to have in favor of a small gas burner next to the sink, powered by a gas cylinder under the sink; vinyl fake-ceramic wall tiles line the kitchen wall. He still has a 220-volt fridge, but his inverter is insufficient to run it. The bed is a loft level about head height which can be moved aside to allow you to stand up, ceiling height 192cm. The air conditioner runs off 12 volts. Mateo of #Al-Mundo-con-el-Mate reveals his height as 176cm. There’s a bathroom with a sink and super-luxury shower, with cuerina (naugahyde) to keep the water vapor in. The toilet is a baño seco, a separating toilet with sawdust to dehydrate the poop; he made the urine separator out of PVC pipe.
on 02024-05-01#vanlife #Al-Mundo-con-el-Mate #pricing of the stuff for their motorhome conversion. Demonstrates some of the techniques they used: pop-riveting wooden stringers to the van’s steel rafters, varnishing knotty softwood while kneeling on cardboard, etc. They said they planned the whole thing for five years. Or maybe three. This #video is a waste of time, a guy talking to the camera interspersed with shitty stock footage. Fortunately the costs he provides are converted to dollars, and using the blue dollar rather than the official one. The van itself runs about US$31k–US$42k, I think (though he doesn’t say), but the conversion involved electrical installation (US$2900), water and gas plumbing (US$3164 including, for some reason, the fridge and air conditioner and maybe the stove?), and the building stuff (US$500, including wood, insulation, etc.), and they also had to buy tools (US$340), plus paint and screws. The electrical installation involved two humongous 275-amp-hour batteries, an MPPT solar charge controller (“Epever” brand?), a 40-amp battery charger, and a 1500-watt inverter. They did actually put a tiny bit of fiberglass and polyethylene foam insulation in, contrary to my previous speculations, but we’re mostly talking about millimeters of insulation, not centimeters. As I speculated, almost all the interior is wood, but it’s not pine as I’d thought, but the super-lightweight kiri (Paulownia tomentosa), technically a hardwood but extremely fast-growing and abundantly produced in Misiones. The two of them spent three months working on it.
on 02024-05-01#video #Al-Mundo-con-el-Mate the #vanlife shower floor (plato de ducha) ended up not being level and therefore not having proper #drainage, so instead of fixing it, they decided to put a wood floor above it so they wouldn’t have to step in the cold puddle. But they were trying to do this in a corn field in Misiones with power tools (run off the van battery?) and ran out of sandpaper. Then he kind of screwed up the bottom of the vinyl accordion door with a reciprocating saw to make space for a threshold to stop it from scraping holes in the vinyl flooring.
on 02024-05-01#vanlife #video channel "AmericAndo" of a couple from #Argentina entering the #USA in their van (SXZ 125) after four years of driving, at the McAllen, Texas (and Reynosa, Sonora, and Pharr, Texas) border crossing on the Anzaldúas bridge. The border folks searched their car with a drug dog and looked up their YouTube channel, but they said it was “one of the easiest borders” they’d crossed, and they can stay 6 months. They camped overnight in the Wal-Mart parking lot, got stopped at a police checkpoint, marveled at the lack of pedestrians, visited some friends in San Antonio, threw an opossum in the garbage, and added a new removable wood desktop to the middle of the van.
on 02024-05-01#vanlife #video #Al-Mundo-con-el-Mate they ran out of butane to heat their van with in El Chaltén, because most gas stations don’t sell butane or propane there. (I’d suggest that their total lack of insulation may also be a factor.) The front of the van isn’t actually quite as #stealth-camping as the previous video led me to believe; there are two solid vertical gray partitions behind the seats, which doesn’t look much like a normal minivan. They had filled up an extra container of liquid fuel at a gas station, which they store in wooden storage compartments under the bed, which does indeed have rear-door-accessible storage as I had speculated, which also seems to contain foldable camping chairs, a telescoping ladder, a fire extinguisher, the gas cylinder that powers the hot water heater, etc. There seems to be a plywood floor. Also they’ve plastered their van with YouTube promotions, making it much less stealth. Mostly the video is driving around southern #Argentina, going to RV parks, hiking around near waterfalls, a hamburger recipe with homebaked bread, that kind of thing. They report using the app Overlander to find out about free Wi-Fi, and they demonstrate emptying the graywater tank in some kind of parking lot specifically designed for this (“Estación de Descarga”/“Dump Station”). They normally empty out their cassette toilet tank into other toilets, rather than blackwater hookups, but here they demonstrate emptying it into the dump station. Mateo demonstrates how he sets up a desk in the van’s front seats, partly hidden by a sunshield in the windshield, to work on his laptop.
on 02024-05-01#video on #vanlife #stealth-camping in #Argentina (channel "Al Mundo con el Mate") in an 02019 Mercedes Sprinter 415 “mixed” van (i.e., with windows, which are tinted), license plate AE 043 BE, about US$31k–US$42k. It’s a little shorter than the 515, which is harder to find parking for, but tall enough to stand up inside, with 5m² inside space. The solar panels on top are quite low, so you don’t see them from ground level; on the outside of the van you can see a ventilation louver on the bathroom, the drinking-water inlet, a power connection, and an extra sliding window which is over the bed. They have a two-burner stove with electric ignition and oven fed from a butane cylinder inside the van, plus a third burner they can place outside, and a second butane cylinder for the hot-water heater. Because the stove isn’t designed for motor homes they have to take the wire top off to drive, and it doesn’t seem to have a countertop option to use it as a counter when not in use as a stove. They have an electronic gas alarm (“Intelligent Gas” brand) next to each butane cylinder. They installed a 100ℓ “Belli” brand dorm fridge, but I don’t know if it’s a compressor type, ammonia absorption, or what. It’s partly blocking the van’s stock sliding door, so it can’t be vented outside. There are latches on the fridge and (25ℓ) freezer doors, suggesting that it’s a motor-home-specific design. The internal furniture is almost entirely wood painted and screwed together with wood screws, probably making it rather heavy. There’s a kitchen sink with two faucets, one straight from their 200ℓ water tank and one filtered. The sink, like the stove, seems to lack a countertop option. They have a 100ℓ greywater tank underneath the van. The indoor paneling looks like white-painted beadboard, with wallpaper around the sink, perhaps to protect from splashes. The dining table is a 600-mm-long slideaway thing between two (600-mm-wide) bench seats. The slideaway table seems like a missed opportunity to put drawers underneath the tabletop. They have two GreensunSolar JFM275-12 gel batteries under the seats (in the video he says “275 ampere” but they’re actually 2500 ampere deep-cycle gel batteries, 275 ampere hours, and also they cost US$600 each) which power an inverter and a large breaker box with six 240VAC circuit breakers. Their charge controller is a 40-amp Aleba BC-1240. There’s a narrow round aluminum flexible duct (100mm?) running, for no obvious reason, from the hot-water heater in the bathroom through a cabinet to a non-obvious chimney on the roof. The ceiling seems to be stained and varnished pine with some wooden crown moldings, and maybe 2cm up to the roof-vent fan, not enough for any insulation. It doesn’t look like there’s any insulation behind the beadboard walls either. There’s a 12-volt air conditioner above the bed, which also isn’t visible from the ground outside. The 130cm×190cm bed, in the back of the van, is normally collapsed to half its length, extending out for sleeping over the dining table and seats and the refrigerator and the sink, a process which takes one person about 45 seconds because the sheet is already on. The bed is about waist height, so underneath the bed is presumably storage space accessible through the Sprinter’s back doors, though that isn’t shown. The 110cm×75cm bathroom has a folding accordion door, a cassette toilet (“portapoti”), vinyl flooring on the walls screwed down under some wooden moldings, the 6ℓ gas hot-water heater, and a shower with a plato de ducha floor like you might install in a house. There’s a curtain hung behind the van seats separating them from the living area, so the cab looks like a perfectly normal van.
on 02024-05-01#HTME #video on the lead chamber #materials process
on 02024-05-01DIY semiconductor photosensors from copper oxide #video #hardware #electronics
on 02024-04-29#vanlife #video on #stealth-camping spots in the #USA: hotel parking lots (that don’t require a tag on the cars), rest areas (which often include water tank facilities), residential areas (if you’re not in an RV; arrive late and leave early, don’t park in front of somebody’s house, and check recs on the app Overlander), marinas, non-marina boat launches, Home Depot, trailheads, freeway pullouts (especially on the Pacific Coast Highway), and “beachs” (but be sure to check the tides).
on 02024-04-29#video #toread Cemex vs. Jesmonite #composite #materials
on 02024-04-29#video on #stealth-camping #vanlife in a box truck. Luke Siebert converted a US$34k two-axle work truck, an 02007 Isuzu NPR HD, 28 “feet” bumper to bumper, 8 “feet” tall inside, 7.5 “feet” wide inside, 20 “feet” long inside. Wood stove, felt on the walls, fume hood over the two-burner gas stove, sliding glass door in the back, blackwater and graywater tanks, 30- or 40-“gallon” propane tank, three solar panels on top. Superdeluxe US$20k camper conversion.
on 02024-04-29#video claiming #stealth-camping isn’t necessary for many people because I guess they can just park elsewhere if people don’t like it. YouTuber claims that in 8 years of #vanlife they’ve gotten three Knocks, all in Wal-Mart parking lots, including one in Las Vegas that had stopped allowing overnight parking, and also one time his big RV got tire chalk and a threat of ticketing in his mother’s neighborhood if he didn’t move it. Recommends an app called Allstays to find out where camping is permitted.
on 02024-04-29#video of casting #mechanical lathe beds from scrap iron in holes in the dirt with lots of cores, then machining them on a planer, in Pakistan. The planer seems to have been retrofitted with brazed carbide tooling.
on 02024-04-29another small-van #vanlife #stealth-camping #video in Los Angeles where the guy goes to like coffee shops and the beach and shit. He has a gas burner in his van which he uses to make scrambled eggs with potato, cheese, and hot sauce, and a small kitchen sink, etc. His poorly-soundproofed van lets the traffic stress him out. Dude wastes a shitload of your time talking to the camera.
on 02024-04-29#stories-from-a-van #vanlife #video about #stealth-camping in Los Angeles using Spot Angel to find free parking and avoid street sweeping hours. One benefit is that he parked near a Hollywood Bowl show he was going to and then could walk back to the van from the show instead of having to deal with the traffic.
on 02024-04-29#stories-from-a-van #vanlife #video about, mostly, plumbing. A collapsible camping sink and a funnel gains Evan’s approval, but he suggests using a pressurized hand pump sprayer instead of a little USB pump to get running water. He also strongly endorses Further Fabrication’s carpentry skills.
on 02024-04-29#stories-from-a-van #stealth-camping #vanlife #video. Has 200 watts peak of monocrystalline #photovoltaic panels for #energy autonomy, dropping down to 20 watts on cloudy days. Reviews dc-to-dc chargers, automatic charging relays, “shore power” (plugging the car into an outlet), etc. He did the Nissan NV200 (car) conversion in 02018, with only 100 amp hours of deep-cycle lead-acid, after an earlier fancier Mercedes Sprinter conversion with 400 amp hours of LiFePO₄ batteries; he says it no longer makes sense to use lead-acid batteries because LiFePO₄ only costs 40% more. (That was August 6, 02021.)
on 02024-04-29#video by #Breaking-Taps about a homemade #vacuum box, made from a used eBay Laco Technologies box, so not really very homemade at all. Explains roughing rotary vane pumps vs. his 50krpm turbomolecular pump that gets down to 2.4 nanobar, oil mist eliminators, coaxial foreline traps to eliminate backstreaming of oil, ISO 100 flanges, KF16 and KF40 and KF50 flanges, conflat (CF) flanges with copper gaskets, KF/NW centering rings with green Viton O-rings, etc. This is the first time I remember seeing a detailed explanation of the KF/NW flanges, and I really like the design.
on 02024-04-28#Advanced-Tinkering #video about a homemade magnetron. Explains #vacuum considerations like vent holes for screw threads to prevent virtual leaks and face seals rather than radial seals (due to, he says, his inexperience). He used #3D-printing to make drill guides to transfer the precision of his 3-D printer to his drill and thence into stainless. He’s doing water cooling inside a copper plate in hard vacuum! But his water-cooling hoses aren’t exposed to vacuum. He’s powering it with the guts of a microwave and a half (one MOT and two oil caps) plugged into a variac. He got his metal parts machined by his video’s sponsor PCBWay. One of them cost him US$227, US$1170 for the entire magnetron assembly.
on 02024-04-28#video about “putting salt on your electronics soldering iron” is actually using a tin/lead solder electrode for #electrolysis with tuz (NaCl) to tin(?)-plate an oxidized copper wire and then his carbon-coated kind of ruined soldering-iron tip
on 02024-04-28#video #toread about #mechanical threaded inserts for #3D-printing
on 02024-04-28#video #toread about #mechanical motors in hobby robotics
on 02024-04-28#video about improved #mechanical servomotors for hobby robotics. He’s using an SPI magnetic encoder with on-chip sensors to read the motor position, controlled with an #STM32 G0 interfaced via I²C, programmed in Rust, which controls an LV8548 H-bridge driver chip, which can handle 12V 2A output. #microcontrollers #electronics #hardware
on 02024-04-28#video about improved high-speed linear actuator #mechanisms design using carbon fiber for #Harrison-Low's juggling robot. Now his motor is in the linear actuator itself, and its shaft has two reels on it, one to let out string (kevlar kite string?) and one to take it up, or vice versa when moving the other direction. He’s also added TPU sleeves to the six bearings he was using as rollers to constrain the shaft’s motion to one degree of freedom. I think it's about 500mm of stroke. He’s able to get 3.4m/s and >50k cycles endurance. The theoretical precision is 8.4μm, which is more precise than his ±20μm Mitutoyo calipers, but with a pulley mechanism he got a standard deviation of 57μm, which is pretty good. The string breaks at about 70 or 80 newtons. #robotics
on 02024-04-28#Harrison-Low #video about a #mechanical linear actuator design for a juggling robot, capable of a full 263mm stroke in 100ms. He’s mostly using carbon-fiber reinforced plastic tubes, with six 6001RS cartridge bearings for rollers (one too many for #exact-constraint), held in place by a piece made by #3D-printing, with interchangeable spacers to adjust the fit in 100μm units to the imprecisely-sized tubes. He’s doing the actual actuation with a kevlar-kite-string cable drive, with the cables actually run through teflon Bowden tubes so the motors don’t have to add mass to the actuator joints; the motor pulley has two V grooves for the two ends of the cable. This seems like a good way to do robotic #mechanisms in general. This replaces his first hydraulic design made out of syringes and a second iteration using a ballscrew which was too slow and (I assume) also super expensive. He has an AS5048 magnetic encoder for positional measurement, coupled to the actual moving parts with a constant-force spring, whose rotation is what it measures, but so far he’s just using encoders on the motors themselves (which I guess are brushless since he’s using #ODrive; in fact, the motors are ODrive-branded, model D6374-150KV). He says ODrive's current sensing “completely removes” the need for limit switches. His attempts to clamp the three frame tubes with a flexure from the inside failed, but I don’t know why he doesn’t clamp them with a flexure on the outside, instead relying on hammering them in. He uses a thin wire with a hook bent on the end as fish tape to pull the kevlar string through the teflon Bowden tubes, but doesn’t always need it because of how stiff the kevlar string is. On one occasion the kevlar string was able to friction on the 3-D printed plastic and just cut right through it, presumably from heat (a big advantage for kevlar over UHMWPE, except when you want to cut it; presumably kevlar will creep less for the same reason). #robotics
on 02024-04-28#video about #mechanical #gears sliding; #math says that if you take a parametric curve γ(s) and add a parameter t for its motion over time γ(s,t) the Jacobian of that function will have determinant zero at its envelope (where movement through time is the same as a movement along the surface), and from that this video derives a closed-form parametric representation of that envelope curve, which is the mating gear.
on 02024-04-28this #video about getting an old Fanuc industrial robot arm working properly under #LinuxCNC is pretty nice:
on 02024-04-23A lost #video of the 128-byte #3D #graphics #raytracer called #Spongy. #small-is-beautiful
on 02024-04-15#Primitive-Technology downdraft kiln #video #toread #bushcraft
on 02024-04-11fiber laser homemade PCBs #video #toread
on 02024-04-11Kari Stone of Mythbusters reacts to Dr. Stone #video not worth watching
on 02024-04-112 hour video of “these amazing skills” #video #toread #vapid
on 02024-04-10the bizarre paths of groundwater around structures (drainage!) #video #toread
on 02024-04-10#Fraser #video on #electrolysis and Faraday changed how I thought about electrolysis and electrochemistry.
on 02024-04-10#TPAI on boost converters #hardware #video with a demo of a manually-operated one. He mentions the TL494, which he “doesn’t recommend as a beginner’s project”, for which he recommends the LT1070, which he then builds a 20V laptop charger around. For his water-wheel power supply, he uses the “Delon circuit”, a full-wave rectifying voltage doubler with five components. Then he uses it to charge his cellphone and a gel cell from a stream. #electronics
on 02024-04-06AS5600 magnetic encoder example #hardware #video #toread
on 02024-04-06designing strong parts for #3D-printing #video using a pinch collar for his drill press as the example, discussing slicing direction and how perimeters are stronger than infill.
on 02024-04-06#3D-printing mysteries that need to be solved in 02024 #video #toread #clickbait
on 02024-04-06#Angus recommends “best free CAD” software for #3D-printing. #clickbait carefully omits any actually free CAD software! #video
on 02024-04-06“worst DIY electrics I’ve ever seen” #video #toread
on 02024-04-06#3D-printing design for vase mode #video #toread
on 02024-04-06“off-grid living is a lie” #video #clickbait this guy and his wife lived in and then later built a series of off-grid and semi-off-grid houses, including three log cabins, over the last 30 years. Also, living in tents on a raft floating down the Yukon. Most of the video is a slideshow of his photos with a voiceover. He’s very proud of not having borrowed money for housing since his first cabin.
on 02024-04-06“I built a castle for my daughter” #video #toread
on 02024-04-06testing cheap US$5000 Chinese rock crusher #video #toread
on 02024-04-06#stealth-camping in an abandoned automobile, actually an ambulance, in the middle of a forest. #video #toread
on 02024-04-06“I built an underground bunker” trying to repair following the “#spider-hole” collapse. #video It did turn out that there were some mushrooms growing in the wood, hemlock or no. He hypothesizes that the air space between the wood walls and the dirt behind allowed water to cascade down the dirt walls, eroding them, a theory which seems dubious to me. A puzzling thing is that it looks like the previously dug 2×2 meter room reached to within centimeters of ground level, so the timber ceiling must have poked above the ground at some point, which I don’t remember from the earlier videos. #drainage
on 02024-04-06“this cabin build sent me to the hospital” #video by the spider hole dude. He built a cabin up off the ground out of wooden cable spools. The inside walls are all full of expanding spray foam, and he thought sanding it would be a good idea. He was using a P100 mask with charcoal filters, which seems like it ought to be up to the job. Cordless power tools with lots of batteries can build shit in the woods. The sanding disc on his cordless angle grinder shapes the foam very nicely and even slices it somewhat. The second day he wore a Tyvek suit to keep the powder out of his clothes. After ten hours of sanding, the conical roof is pretty smooth, and he wants to coat it with drywall mud and slightly sticky fiberglass mesh normally used for stucco; I guess the idea is that the stickiness of the mesh holds it in place until you stucco it. He suggests adding Dawn dish soap to your drywall mud so it goes on smoother. After he mudded the ceiling with chemical-setting Sheetrock 90 mud, the whole left side of his body was numb, which he thinks is repetitive stress injury. After a week of rest he goes back and muds a ledge around the conical ceiling and sprays paint on it with a compressed-air sprayer. RGB LEDs around the ledge provide customizable ceiling color. And he brought in a little projector to project a photograph of the moon and some stars onto it. His little girl is enthusiastic about the color-changing abilities.
on 02024-04-0610-person US$10 10-minute temporary cabin from pallet wrap. They delimbed some trees and wrapped pallet wrap around them, then I guess delimbed and lashed together some saplings (with pallet wrap!) to form gables and put pallet wrap on that too to keep the rain out. They have a nifty folding bow saw, but all the time to delimb the trees with the saw and axes is not included in the 10 minutes, and looks like it was more like three or four hours. Lashing with pallet wrap is a nice idea, giving the appearance of things being connected by spiderwebs, though it was completely unnecessary to do most of it while standing on a stepladder; they could have lashed things together on the ground and then lifted them into place. Even after doing all the delimbing ahead of time, and working in a pine forest planted in neat rows for logging, it took them over 30 minutes and about a roll and a half of pallet wrap, and they didn’t have a door yet, and wind blew under the walls until they piled up pine needles, and it was big enough to sleep maybe four or five people. Adding a door involved a “zip wall system”, basically a long zipper with sticky tape on it which they stuck on one side of the plastic wrap and magically opened, like the door the girl draws in Pan’s Labyrinth. Stretching pallet wrap over a log frame makes a soft cot top, which they then supported on logs. They showed another plastic-wrap cabin nearby that was a year and a half old which looked pretty intact. #video #clickbait #bootstrapping
on 02024-04-06#VICE homemade guns of #Taiwan #video includes Tsai Ing-Wen’s 02016 apology to the indigenous Taiwanese peoples and Tama Talum Suqluman’s prosecution. Indigenous hunters have an exception to the general #gun-control prohibition in Taiwan, as long as they make the guns themselves. Much footage of colorful Taiwanese clothing. “It was in the 80s that the government told us to hand in the guns for safekeeping, and we never got them back.” They’re using nail-gun powder cartridges to drive ball bearings. Covers Tsai’s pardon of Talum. #mechanical #politics #history
on 02024-04-06#stealth-camping in a storm drain #video #toread
on 02024-04-06ozone generator build and testing #hardware #video #toread
on 02024-04-06#manufacturing a high-power #ozone generator #hardware #video using 3000 volts on each of several heatsunk plates to get corona discharge, plus a waterproof industrial fan to blow air through; he says the overall machine, with 3 modules totaling 12 plates, produces 120g/hour of ozone. The frame is welded up from steel structural tubing, with rivet nuts to add threads to the holes drilled in the tubing to which to screw the fan, ozone modules, frosted plexiglass side panels, aluminum top and bottom and fan panels, and air intake grille. The high-voltage wires have all the panels in parallel and are electrical-taped together, potted with household silicone inside a snap-together plastic conduit, zip-tied to the steel frame. He dremels holes in the side panels to epoxy-mount the electronic modules such as the timer, power meter, power entry module, and power switch. The modules’ screw terminals are potted in silicone presumably to prevent ozone damage. Uses about 350W. He doesn’t show the high-voltage power supply.
on 02024-04-06#bigclive inside an ozone room deodorizer #hardware #video #toread
on 02024-04-06#bigclive inside a nasty high-voltage ozone-generator power supply #hardware #video #toread
on 02024-04-06#bigclive high-power shady £16 #ozone generator teardown with schematic #electronics #hardware #video. Arrived with a broken ceramic plate through which it arced. Operates around 4000V and uses the “ridiculously high power” of 155 watts with a power factor of 94%. He says it really needs to be mounted in an enclosure with a fan so it doesn’t overheat. The wires to the high-voltage conductive-ink grids (very hard ink, harder than his box cutter) are silicone-insulated for high temperature, and the solder connections are silasticked over, presumably to prevent lower-voltage corona discharge. He explains that capacitive coupling through a high-dielectric-strength insulator gives you lots of tiny little sparks when you’d get an arc without the insulator. The input bridge rectifier is made out of 1N5399 1.5A 1kV diodes. An interesting oscillator design using a sort of totem pole of two npn transistors, perhaps FJP13009 (700V 12A; they’re labeled J13009-2), driven from (opposite-sense?) feedback windings on a high-current toroid, only used for feedback; its primary is in series with the primary of the resin-potted high-voltage transformer (2Ω primary, 100Ω secondary). Surprisingly to me, there’s a diac in the oscillator, which he says is the “start circuit”. The transistors are mounted on a giant aluminum heatsink through an insulating film (mica?). The primary of the toroid is tied to both rails of the power supply through rather large (0.47μF 400V) film caps, which discharge through the transistors when they come on. There’s no storage cap, so the oscillation dies down when the 50Hz signal is close to its zero-crossings. Originally I thought it was a blocking oscillator, but apparently the feedback through the toroid is positive, not negative; what terminates a pulse is when the film cap, discharging through the two transformers, runs out of charge, and thus stops turning on the transistor it was discharging through. “Normally, with transistors to a positive rail, you’d have a pnp transistor, but in this instance, because it effectively has its own transformer-coupled supply to its base here from the emitter, you can use standard npn transistors for both of them. (...) Much simpler circuitry than I was expecting.” The diac to the base of the negative-rail transistor is activated by a .01μF cap charged up through a 470kΩ resistor pulling it up toward the positive rail, though I’m not sure why you need the cap. The size of the heatsink makes me think it can’t be dissipating more than 5–10W, which means better than 92% efficiency.
on 02024-04-06#bigclive random high voltage eBay thing #hardware #video #toread
on 02024-04-06how to dig fencepost holes in rocky ground (old riverbed). Using a Bobcat skid steer with a post-hole-digging auger that they’ve welded rebar and shit to, which digs a hole in about two minutes, but then he has to pick all the river rocks out. In wet ground it worked better, because the soil wasn’t just sand in between the river rocks; if it were just sand, he’d add dry bentonite in powder form to it as a binding agent. If he had to dig next to utility conduit he’d use his spud bar instead of the auger, not clamshell post-hole diggers. #video
on 02024-04-06another carbide-tipped sawblade turned into an electric auger for digging I guess. He slits it with an angle grinder cutoff wheel, clamps it in a vise, softens it with a rooftop-tar-melting gas torch, and twists it into a helix with a wrench, then quenches it in water. Then he stick-welds it to a steel pipe, in which he nests a smaller steel pipe which he stick-welds in place, and then stick-welds the whole assembly onto a galvanized steel rod he had lying around, with about 100mm of extra steel rod sticking out the bottom, which he laboriously angle-grinds down to a rounded point. Then he grinds a cutting edge onto the leading edge of the auger, then touches it up with a file. Then he chucks it up in his Makita and digs a hole in the garden. #mechanical #manufacturing #video
on 02024-04-06Cyrillic improvised powered digging instrument #video #toread
on 02024-04-06a cool earthborer/postborer #video #toread
on 02024-04-06#digging an #underground 1-bedroom apartment #dwelling. Lots of talking-head filler, like most #Kevin-Builds #video productions. Useful datum: some garage-door panels are steel-faced sandwich panels with a styrofoam interior. He’s using a dump-truck trailer, backhoe, etc., so this is far from bushcraft. Bit of a Minecrafty feel as he circular-saws the legs off his just-crafted table, so it won’t be so tall, while waiting for the pizza to get done in the oven. The plate-steel culvert, canned food, and Tang are less Minecrafty. He discusses but does not show his future plans to put in drain tile “with a sock on it so the sediment don’t get into it” to drain water from below the shelter. Also he put down a tarp under the surface dirt to keep rain from soaking into the shelter from the top, which he did sort of show. #stealth-camping
on 02024-04-06growing #bamboo as the holy-grail homestead plant. He recommends Phyllostachys nigra “Henon” bamboo for its thick wood, Phyllostachys rubromarginata for its flavor and long internodes, some kind of black bamboo for its beautiful black wood, yellowgroove bamboo (Phyllostachys aureosulcata?), and something else. Has advice on propagating bamboo and on killing it off. Recommends Ted Jordan Meredith’s Bamboo for Gardeners and David Ferrelly’s The Book of Bamboo. #video
on 02024-04-06#clickbait underground “tunnel” shelter #video. With a narrow shovel and a lot of sweat, she carves an elaborate bedroom out of the hard, dry clay, including a fireplace, in the hillock under a tree (a commenter says it's an old termite mound, which is why it’s rock-free). The bed and table are elaborately-squared-off blocks of clay, with chamfers to prevent chipping. Beneath the tree there is no risk of a cave-in; apparently the tree does not have a taproot. Maybe she’s Filipina or Vietnamese; her machete curves forward. She lashes a frame together from machete-cut saplings with vines to form a door for her entrance, sloped like a conventional US cellar door. Lashings to hatchet-pounded stakes serve for hinges. Sod cut with the shovel serves to cover both the spoil pile from the excavation and the door itself. A candle illuminates from an alcove carved into the bedroom wall. Smoke from the wood fire up the chimney makes her presence obvious; she could really benefit from Cesar’s pyrolytic coffee-can stove. Coals raked from the wood fire into a cooking pit permit cooking pineapple brochettes and a steak on a Korean-style barbecue on a steel grill she brought, though possibly also risking carbon monoxide poisoning. She cooks with tongs and a kitchen knife, eating with the knife, without chopsticks. A silky-looking green tarp protects her from the bare clay of the bed. The grass in the area seems to be of a mowed variety. Another commenter claims that the interior is not actually filmed in the same place as the exterior, but at 17'22" we can see that it at least has the same tiny entrance, which has the tree roots cut off in the same place. #scouting #bushcraft #stealth-camping
on 02024-04-06fastest way to dig a secret tunnel #video #toread
on 02024-04-06how he started digging his own tunnel #video showing two minutes of the floor starting to flood with groundwater. Not a great video by Hanz Moleman but at least it's 100% content, no stock photos or talking-head filler.
on 02024-04-06excellent trench digging #tutorial on proper shovel use #video
on 02024-04-06hand digging a “war tunnel” and sleeping in it #stealth-camping #video #toread
on 02024-04-06adding an emergency exit to the “#spider-hole” #stealth-camping #video #toread
on 02024-04-06the “#spider-hole” this guy dug on flat ground in the forest got flooded #stealth-camping #video A useful cautionary tale. Once the dirt was saturated with water, plasticizing the thick clay layer, it began collapsing his wooden walls inwards. They were made with short lumber braced against posts in the middles of his walls, but the posts weren’t braced against anything, nor were they screwed to the wall boards; once they had moved inwards a few centimeters, the walls broke free, and the mud flowed down from above ground level until you could see daylight. Actually it was holding until he pumped the meter of water out of the interior, at which point the increased pressure difference had that effect. Drainage is utterly fundamental for underground building. One commenter pointed out, “I wouldn’t go in later without breathing protection, it’ll be a mold hole.” Other commenters pointed out that digging a sump under the floor so you could pump it out would help, and that having an elevated floor would help. #Drainage, man. Motherfucking drainage.
on 02024-04-06backyard tunnel construction #video using the usual ditch-and-cover method but with a passel of teenaged boys with shovels instead of, say, a backhoe. Once the trench was dug, they lined its walls with wide knotty pine boards and the occasional bit of plywood, then roofed the trench with plywood, then covered that with dirt.
on 02024-04-06drilling a well with an electric drill and a chain ring #video #toread
on 02024-04-06fast well digging by hand #video. Looks like northern Mexico. Three barefoot guys with shovels hit water about five meters down, but have to start breaking rocks with sledgehammers. Galvanized buckets on pulleys remove rocks and some of the mud once it’s inconvenient to throw it all the way out of the hole. Square wooden posts support a shade tarp and the pulleys. Audio is in Spanish and has had its pitch shifted, perhaps to evade copyright-infringement-detection algorithms. Once the water starts slumping the walls, they begin casing the well with mortared bricks. An old woman watches from the rim of the well, arms akimbo. A scaffolding built from scrap wood inside the well permits extending the masonry to the surface. Rebar is bent and tied to form a permanent support structure over the well, cement mixed from bags in a heap on the ground and carried in the buckets to slop in around the masonry. Centring constructed from dry-stacked bricks supports a circular reinforced concrete arch over the well, perhaps poured in forms we don’t see. A permanent pulley is affixed to the arch.
Then we cut to what looks like a similar well-digging operation in Pakistan, aided by a tractor engine powering a windlass hoisting apparatus through the power take-off; in this case a tripod over the nascent well supports a pulley but no shade tarp, and spoil is hauled up from the bottom of the well by the engine in a large cloth bag rather than by hand in a steel bucket. This time the well is 10 meters deep, and the digging implements look sort of like an adze or a huge hoe than a shovel. Again the well casing is built from fired-clay bricks joined with mortar, starting from the bottom, but the foundation is thoroughly mortared over, hiding the bricks. The final casing has two layers of bricks, and a steel ladder set into the brick side.
Then the real well drilling begins, lowering steel pipe segments of perhaps 200mm diameter into the bottom of the well, guided by barefoot workers in beige kurtas. It’s unclear how they are penetrating the floor, but it seems like spoil is being hauled up through the pipe with a sort of two-meter-long bucket, making space for the pipe to slide downwards. To screw pipe segments together to reach the top of the well, a strap wrench is improvised from a tree branch and a few wraps of rope. Finally the pipe is fitted with a flange which is bolted to an elbow and another flanged pipe running horizontally, presumably to carry off the well water.
Very poor quality video from "Machinery Magazine", omitting many crucial steps. #Plonk!
Are they the stupid motherfuckers, or is the guy who watched the video the stupid motherfucker?
on 02024-04-06digging underground sandstone tunnels #video in Sandland, in Western Wisconsin, a group of volunteers
on 02024-04-06drilling a well with a hand drill #video #toread
on 02024-04-06drilling a well at tens of meters per hour #video. In Pakistan. Apparently manually drilling with a sort of coring drill (aided by water), and hauling the whole drill string out of the hole by hand every time the core gets full, then banging it with a wrench to knock the dirt out? 150mm does seem like a good diameter for a well. Once the drill string gets too long to use this way (maybe 6 meters) they put together some 150mm pipes for further drilling. Cloth is packed around the pipe in the hole to keep it centered. It sounds thin like stovepipe, but it’s stiff enough to support a platform with a guy standing on it. Then they drop a much longer (2m) coring drill pipe down there on the end of a long cord, and as they move it up and down in the hole, the platform slides down; evidently it’s undermining the pipe he’s standing on. Each time he hauls it back out of the hole, it’s full of mud. Once the platform reaches ground level, screwing another pipe onto the end of this well casing with a chain wrench permits moving the platform back up. The chain wrench serves as a stair to climb back onto the platform. Much water is poured down the wellbore, a couple of liters at a time, to reduce the dirt at the bottom to mud. (A 200-liter barrel is next to the well for this purpose.) They perforate a big (50mm) black PE pipe and lash a filtering cloth around it, then lower it to the bottom of the well. The pipe displaces water out of the well casing as it slides in. They remove the well casing using a couple of logs and a chain ratchet to pull it bodily back out of the well. Plastic cement connects the black pipe (now the only thing in the hole) to a plastic fitting and then a hand pump.
on 02024-04-06breaking up basalt with #expanding-grout. #materials #video doesn’t seem to say anything about what the expanding grout is made of. “Expando” brand. They drilled 149 holes with a rotary hammer about 200mm apart along crisscrossing lines about 600mm apart and then poured the stuff into them from a bucket with a funnel. Two days later the giant rock had broken into small pieces. The grout had turned white, seems to be crumbly and dusty and chalky when the hydraulic digger picks the rock apart, and seems to have expanded by on the order of 10% of its diameter. The holes where the grout couldn’t split the rock, they split with a hydraulic wedge splitter. Lots of hydraulic bucket digger action if that’s what you’re into. Bleh.
on 02024-04-06#bootstrapping a DIY digging auger from a circular saw blade, some allthread, and an electric drill. And a MIG welder, and a vise, and some nuts, and an angle grinder of course. #video with shitty elevator music. Jesus, they’re using a brand-new carbide-tipped saw blade for this, max 9000 rpm. I can’t read Polish well enough to tell if it’s designed for cutting steel, but I suspect it just says it’s made of steel. Jesus, has this guy never heard of intermittent welding? Because he’s just holding his improvised auger onto his allthread with a jam nut, not even a little bitty weld. In a minute and a half he digs 300mm deep in the garden, okay.
on 02024-04-06review of digging with a 40V battery-powered electric Ryobi auger #video I note that the auger, which was designed for drilling a vertical post hole, couldn’t actually remove dirt from the hole! You had to do that by lifting the dirt — and the auger motor — by hand. Also the auger demands that you spend a lot of time hunched over it. The result is that you can only dig 6–8 holes in a day by yourself before your back gives out, though two people together could do 20–30.
on 02024-04-06ad for an electric digging auger #video #toread
on 02024-04-0624 hours underground in the “#spider-hole” #stealth-camping #video he installs a TV and cellphone antenna (threaded through the air duct) in his secret underground apartment. This is before he added the escape hatch and before it got destroyed by flooding. In this video he also set up a hollow tree stump above ground to conceal his air vent. Also this is where he built a bed onto one wall at knee height.
on 02024-04-06Arduino #hardware vs. Pico #video, but it seems to be talking-head filler mixed with stock images, and the guy ("Gary Explains") seems to be pretty fucking clueless: “Now the Arduino IDE provides a language, they call it the Arduino Language, which is based on the syntax of C and C++, and by syntax I mean, you need the semicolon at the end, where the equal sign goes is the same as in C, curly brackets, all that kind of thing.” Of course actually the Arduino IDE lightly preprocesses your sketch and compiles it with the G++ compiler for C++. #Plonk.
on 02024-04-06“New York’s secret tunnel societies” #history-channel #video #toread
on 02024-04-06digging a secret massive underground room #video as an add-on to the “#spider-hole” video, a couple months later. I notice he’s using a 4.0-amp-hour 18-volt Makita battery to drive screws into his shoring wood; if we assume that battery is 2C then it’s 8 amps and 144 watts. If you could use power tools driven by a few batteries like that to do the digging, maybe you could get the minimal shelter dug in less than 8 man-days? Like maybe you could drill into the dirt with an auger, then move some of the dirt on some kind of a conveyor belt? This seems especially relevant given that in the middle they’re advertising the “EcoFlow Delta Pro” “portable” (with built-in wheels) “home battery”, which features 30A 120V output, which would be uh 3600 watts, the equivalent of about 25 laborers. There’s even an AC-powered rotary hammer in the background of the advertisement shot, there on the forest floor! (Oh, halfway through the video they whip it out, calling it their “secret weapon”.) He also strongly recommends wearing gloves. Also I feel like maybe you could advantageously use galvanized steel studs instead of wood, or maybe even ferrocement. They start singing “Diggy Diggy Hole” in the middle, and he’s enjoying the 12° temperature in the hole because it’s 28° in the forest. Eventually they install a galvanized steel air duct. #stealth-camping
on 02024-04-06what should every Minuteman carry? #video #toread
on 02024-04-067 pieces of cheap camping gear #video #toread
on 02024-04-0612 pieces of cheap camping gear #video #toread
on 02024-04-06build a drone engine from an old hard drive #video #hoarding a two-platter 120GB 7200 rpm Seagate Barracuda specifically. By #Zafer-Yildiz. Normally I’d assume the spindle motor was too low-powered to be useful this way, since they consume about a watt in normal operation, and quadcopters usually use several hundred watts per motor. He solders a “Simonk30A” ESC to the spindle motor and attaches the rotor from a computer cooling fan, which was unsurprisingly also a #brushless motor, with a bit of gelling superglue. He supplies the ESC with 12 volts, which is probably what the motor originally used. Even before he adds reflective tape to one of the fan blades, it seems to be poorly balanced and has a lot of vibration, which is probably not what the motor’s precision bearings are optimized for. Apparently he’s driving the fan at 6600–7900rpm. No force measurements, no temperature measurements, no power measurements, nothing. Zafer, I am disappoint.
on 02024-04-06top 10 tools to make with #3D-printing #video #bootstrapping by #Zack-Freedman: a mouse bungee to retract your mouse cord, a USB cable holder, some kind of camera holding thing, battery-holding inserts for an Altoids tin (to contain lithium-ion fires), a tiny shelving unit for Altoids tins, a screw sorting jig, a folding filament spool for a 3-D printer, a three-inch-long skateboard, a 3-D printing filament spool support, a solder paste dispenser, and a Dremel bit organizer. Pretty lame and disappointing overall.
on 02024-04-0610 uses for a microwave oven transformer: #hardware #hoarding #video by #Murray-Smith. Among other things he demonstrates welding six of them together to get a large motor stator. #toread
on 02024-04-06Irene Sellars, file maker #manufacturing #video unfortunately just a talking head interview
on 02024-04-06Penknife cutler Stan Shaw, who died in 02021, in 01993 #manufacturing #video Confirms that the “pen blade” is for cutting quill pens, and demonstrates the use of a bow drill strung with pigskin, rotating around a horizontal axis and backed up by a breastplate so he can put his body weight behind the drill (though later he uses an electric drill press too). He’s not shy about running his file backwards across the brass or even the steel blades and nickel rivet pins. Something is wrong with the video, though, it cuts him off in the middle of a sentence more than once. He calls his humongous narrow belt sander a “power wheel” and sands the buffalo horn down by pressing it down onto the top of the wheel.
on 02024-04-06Norman Bayliss making moulding planes in 01962 #manufacturing #video #toread
on 02024-04-06#Ken-Hawley on why files “aren’t used any more” #machining #video listing uses like rasping leather shoe soles, sharpening push saw teeth, and mechanical watchmaking which used to use files but no longer do
on 02024-04-06#PlayWithJunk #video: most useful tool for #electronics #hardware repairs is a simple Huntron Tracker curve tracer or “VI curve tester”. Includes very simple schematic with a transformer and three resistors, labeled “#Octopus in-circuit component tester”, though it seems to me like it would not work very well and might actually blow up your scope if the circuit under test had a ground connection. He demonstrates using it to diagnose a blown PSU, desoldering components with an electric-air-pump solder sucker, something I’ve never seen before
on 02024-04-06Ryan Twomey #video on #vanlife #stealth-camping in airport parking lot #toread. He starts out camped at Lake Meredith in Texas. He was actually taking a round-trip flight from the airport (Albuquerque), though, so I don’t know if this really counts! Planet Fitness makes an appearance, the implication being that he showered there.
He has a black cloth curtain behind the driver seats. But I’m not sure how stealthy this setup actually is; it’s a gray huge-ish (Mercedes?) van that’s tall enough to stand up in, and a diesel heater, plus a fan in the ceiling to suck humid air out of the van, and there are solar panels clearly visible protruding off the sides of the van roof, and at night, when he has all the lights on inside, you can see the van’s back windows from inside, which makes me think they are probably visibly illuminated from outside.
He says the Albuquerque airport only charges US$7 a day (apparently for at-airport long-term parking of the camper van in the “Basic Economy lot,” which is in the sun), and he doesn’t have to worry about getting to the airport early. He actually prefers parking in the sun because it charges his battery through the rooftop solar panels and because he worries that otherwise his pipes might freeze.
Some of his kitchen stowage is in a hammock-like net hung from the bottom of the cabinets; another part is hexagonal jars screwed into lids attached to the bottom of the cabinets, over the sink. Lots of footage of cooking and eating.
He has some kind of internet connection in the van that’s about 90MB/s (500Mbps), maybe 4G, since no Starlink antenna panel is visible. He uses it to play Fortnite on a large monitor inside the van.
The whole ceiling has what looks like indirect LED lighting between some parallel wooden boards spaced some distance apart.
He takes his laundry to his friend’s house to wash it.
Commenters out that airports often feature bathrooms, free Wi-Fi, and a food court.
on 02024-04-06building a secret dugout #bushcraft #stealth-camping #video #toread
on 02024-04-06Walmart “camping gear that doesn’t suck” #video. First, a US$15 17ℓ backpack (make and model not disclosed) with tie-on nylon straps (“MOLLE”) on the outside, water-bottle pocket, and padded shoulder straps. He stuffed a polyethylene foam sitting/kneeling/hip pad into the back of the backpack to give his back a little more cushioning. He got a US$5 32oz. polycarbonate (?) water bottle (make and model not disclosed). Also US$12 “Hyper Tough” brand gloves. Also US$5 “Equate” brand 85-item first aid kit. Also a US$20 “Stanley Venture Pot”, a single-walled stainless pot for cooking over a fire, into which you can nest a small butane camping fuel canister (from REI, not sold at Walmart), and which nests into the cheap (#pricing, make, and model not disclosed) stainless nesting cup. The “Venture Pot” also comes with two nesting foam coffee cups. He got a US$12 “Ozark Trail” brand (Walmart’s house brand) gas camping stove burner with a piezo igniter (model 31408, now US$15) to cook over the fuel canister, which acts rather like a blowtorch actually, suggesting propane in the can. His dishes are an “Uco” brand “mess kit”, because I guess he really likes military fantasies, model and price not disclosed, which has a hermetic gasket. He got dried (?) pulled pork and Maruchan ramen, too. He got “Koogwans” (?) brand aluminum Y-stakes (model and price not disclosed) to hold down a tent. He’s sitting on a US$10 5×7 tarp (make and model not disclosed) from Walmart. He got Gorilla Tape (apparently black electrical tape?), paracord, Bic lighters, Uco “Matchsafe” “lifeboat-style” safety matches in a watertight gasketed case, all at undisclosed prices, and a US$4 “Ozark Trail” brand fire-starting “steel” (really Mischmetall). He got a couple of “S-biners” of a brand I didn’t catch (price not disclosed). He got “Nice Glow” brand glowsticks after Halloween for US$1. He got an “Ozark Trail” brand 7-“inch” folding saw. He got a US$11 USB-rechargeable “Ozark Trail” brand LED headlamp (model not disclosed).
on 02024-04-06turning a U-Haul van into a comfortable home for US$365, without making it impossible to return after the rental! This is their $19.95 per day van, not tall enough to stand up in. Goals: sleep, eat, excrete, relax. Camp cot, camping pad or mattress topper, sleeping bag, blanket, plastic drawer totes, filing cabinet, plastic totes under cot, duffel bag, 20ℓ bucket (maybe with pool noodles or pipe insulation), plastic water basin for dishes, towels, wet wipes, camp mirror, propane camp stove with canister, skillet, pot, silverware, cooler (12V compressor fridge usually but in this case just a styrofoam box), foldable camping chair, folding TV tray table, aluminized bubble wrap for the windows. No insulation, no solar, no battery, no air conditioning, no water, no shower. #stealth-camping #vanlife #video
on 02024-04-06solo overnight using 6 #stealth-camping tips #video #toread
on 02024-04-06#bushcraft breakfast cooked on a rock in the rain #video #toread
on 02024-04-06smoking fish #cooking for long-term storage, #video of #bushcraft using sticks and bark. He’s a little vague on what aspects of his fish smoking process are important for safely preserving the fish for what period of time. Claims that eating saltwater fish raw is safe, which I don’t think is true.
on 02024-04-06“build secret underground bunker with fireplace in 18 days” #video in the desert with a burro, a dog, and a goat, none of which do a lick of work, stuccoing handbuilt stone walls with a rather annoyingly expansive clay, and digging out a cave in maybe limestone? Hammering in nails with an adze into hand-hewn timbers for a roof. For concealment he scoops dirt onto a tarp covering the timber roof. The entrance into the cave through the roof (vaguely reminiscent of a kiva entrance) is slightly proud of the surrounding dirt, and located on a slope, both of which favor drainage. The large amount of disturbed dirt would be very obvious to hyperspectral satellites of 5-meter resolution or better, but not to the naked eye. Scorpions, frogs, ants, and giant millipedes make appearances. Chimney appears to be a campfire from aboveground; rice and fish are cooked in camping pots in the fireplace. The roof door (nailed-together debarked timbers) only concealed in use with a tarp and brush.
on 02024-04-06living in #Slab-City from Rabbitside camp #video #toread
on 02024-04-06pack like a hobo #video #toread
on 02024-04-06#stealth-camping like a hobo from the 01930s #video seems to be some kind of poorly filmed fiction with no useful information; I’m not going to finish it
on 02024-04-06#stealth-camping on the smallest roundabout yet #video #toread
on 02024-04-06fully enclosed tarp #stealth-camping #video by Claire #WildBeare. She has a 3m × 2.9m “SuperLight” brand tarp from DD Hammocks, and she converts it into a tetrahedral tent (with no floor) by pegging the tarp’s four corners to three points on the ground and then lifting up the midpoint of an edge on her trekking pole, which was insufficiently tall, so she instead pulled up the tip of the new tent on a ridgeline run between two trees. Then she sets up a ground sheet inside, and bedroll, and air mattress, etc. The edges of the tent don’t quite reach the ground, leaving some air space. Most of the rest of the video is her cooking on a campstove and eating sausages. Not really very stealth, and I’m not convinced that it would work well in the rain.
on 02024-04-06freeway interchange #stealth-camping #video, in a sparse strip of forest a few seconds’ walk away from the freeway, the forest strip being only about six meters wide. He strings up some camo netting between the trees during daylight hours to hide the campsite, then puts up a gray-green tarp canopy, and under it, a low white tent covered with a forest-camouflage cover. Lots of military-surplus gear, but for once it doesn’t seem like military fantasy but a practical way to escape notice. Not the most pleasant environment with the incessant traffic noise, but he says he doesn’t mind it and could stay for days. He does his cooking about an hour before sundown, on a so-called “instant barbecue” (“Zip” brand), to avoid lights after dark. This seems to be a metal dish with naphtha-soaked charcoal in it, which makes enormous, visible flames when lit. Once it’s burned down to coals, he puts a foil pouch full of frozen pasta onto the expanded-sheet-metal top. The base of the “barbecue” seems to be thin aluminum flashing. To all appearances, the coals are just sitting directly on the flashing, with nothing to keep them from burning through the aluminum; after a couple of hours he extinguishes the fire with water. I thought he failed to wake up to strike camp before sunrise, but actually he deliberately arranged for his ride to pick him up well after sunrise.
on 02024-04-0615 #bushcraft tips for surviving 100 days alone #video #toread
on 02024-04-06#stealth-camping in the city #video. Full of ultra-right-wing propaganda, misinformation (starting with “over 80% of the population of the world lives in a [sic] urban environment” at 1'16”) and talking-head filler. Also the guy tries to use bigger words to sound more important, but isn’t very clear on what those words actually mean, so he ends up misusing them, making him sound like a policeman and making the video harder to understand. Unsurprisingly there’s also a bunch of soldier cosplay and ammunition ads, followed by a lot of bragging about how great they are. Finally they start talking about the actual topic around 6'00", but it turns out they’re talking about how to run away from the police, not how to stealth camp. It's 100% talking-head filler for the first 7 minutes, but then after he demonstrates taking off his shirt and walking down an alley, we’re back to talking-head filler. At 11 minutes they’re recommending mesh networks, but again, just talking to a camera about them. Finally at 19'19” the #survivalists start trying to demonstrate how to improvise a charcoal filter for water, in case you’re in a city whose water has been cut off by a natural disaster, but they don’t actually finish it. Some potentially effective suggestions: collect dew from short grass with clean socks tied around your ankles, sleep in shifts so there’s always someone on watch, sleep in parks or under bridges with hobos, steal their clothing, beg facemasks from protestors, eat food out of the garbage, maybe cook food with citric acid, eat insects, and you can go two weeks without eating. A less effective suggestion is to try to cut rotten meat off of steaks to eat the non-rotten part.
on 02024-04-06super #stealth-camping #video by British woman #WildBeare under a camouflage net in a depression in the ground near a freeway, blending in to the dry oak leaves that cover the ground.
on 02024-04-0660 #bushcraft tips #video #toread
on 02024-04-0620 extreme #stealth-camping tips #video #toread
on 02024-04-06#stealth-camping #video sleeping in a “non-permissive environment” (for soldiers or civilians in disaster scenarios, but generally with non-permissiveness caused “by the enemy”) Apparently FM7-22 says that soldiers need 8–9 hours of sleep per night, up from 4. His first recommendation is to dig a so-called “ranger grave” with an entrenching tool to get below ground level, “if the situation dictates”. For wet-weather gear he recommends surplus Gore-Tex gear and specifically “full-zip” pants that you can put on without taking your boots off, and especially a poncho, which can also be used as a ground cloth; he especially likes the USMC tarp poncho and the Bushcraft Outfitters poncho, which has snaps for different configurations. Mostly some bozo talking to the camera, though it does demonstrate some of the gear.
on 02024-04-06#video #ceramics “firing the replica Roman pottery kiln at Vindolanda”. Except for the mud chinking or “clamming” of the “roof” or “capping”, this “top-loader” kiln is reusable, built in imitation of a Roman-era design, and they fill it full of 88 pots before wood-firing it, with a voiceover explaining how the Romans did it. Eventually they’re firing in reduction, with flames streaming out of the exit flue at the top. Their thermocouples say the maximum temperature reached was 958° after using 107kg of wood. If I had to guess, they had fired about 40kg of pots. They waited until the next day to open the kiln, presumably to prevent thermal shock, and the firebox was empty, meaning that the kiln had probably gone back into oxidation before it finished cooling, preventing the production of the desired black ware. No pots broke, though.
on 02024-04-06#video #toread on cooking in “wild” clay #ceramics #bootstrapping
on 02024-04-06#video on saggar firing #ceramics in a homemade raku kiln. But her saggar is ALUMINUM FOIL‽ Before firing she applies a terra sigillata coating to bone-dry clay, then burnishes it with a lint-free cloth to a beautiful shine, much like a #dorodango. After bisque firing (which seems to remove the shine, so maybe 995° wasn't hot enough to vitrify the terra sigillata) she pours ferric chloride over the pots, which surprisingly restores the surface smoothness, and after it dries, does it again. Then onto the wet ferric chloride she sprinkles blue vitriol, green vitriol, and Miracle-Gro from salt shakers, along with sugar and epsom salt. To protect her dining-room table from the ferric chloride she uses a polyethylene tarp. Inside the base of the “saggar” she adds straw or pet-shop sawdust to, I suppose, create a reducing atmosphere, and also apaprently to blacken the base of the pot. She also includes some bladderwrack or copper wire or saltwater-soaked twine or horsehair to mess up the pot’s surface more, then wrinkles the foil shut around the pot to make the final “saggar”. She did the initial bisque firing in an indoor electric kiln, then the final “saggar” firing in a gas-fired ceramic-fiber-insulated giant soup pot. Warns about the chloride fumes. Her target temperature for the “saggar” firing is 750°, which seems like plenty to melt aluminum, and her target ramp-up time is 35–40', after which she turns the kiln off, waits for it to cool to 300°, and then opens the kiln to remove the miraculously-still-intact aluminum-foil “saggars”, though she says, “On some of the pots it will have almost completely crumbled away.” She unwraps the others while still hot to permit some oxidation. When cool she polishes them with furniture wax.
on 02024-04-06#VICE on “New Zealand’s lost hippy commune” Mahana #video about mostly a guy who is sad that his Mahanamates are working to keep new people from coming into the community
on 02024-04-06more sympathetic #Slab-City documentary by Off The Cuff #video
on 02024-04-06“ultimate” #stealth-camping van #video "Stories from a Van". Looks like a dream come true. It looks like any old ordinary white Nissan minivan, with a gray curtain behind the bucket seats, no side windows, and a tinted back window, but inside it has a cassette toilet, a bed, a desk with seating, a sink, clothes on hangers, a deep-cycle battery powered by roof solar panels, a graywater tank, and a shower (though it is not tall enough to stand up in). He says he lived in it in San Francisco for a year and could park anywhere and nobody ever bothered him. Rooftop vent, indoor 12V LED lighting, Igloo cooler, 1000-watt inverter, dual removable freshwater tanks, and the graywater tank slowly leaks onto the pavement under the van. Wind deflectors on the front windows allow him to crack the front windows to let in air without them looking open or letting in rain. He’s using ice in the Igloo cooler for food storage, says it lasts a week and a half. Probably would be useful to have active refrigeration. He says the “automatic charging relay” that charges the deep-cycle battery from the van’s alternator when it’s running hasn’t been needed because the two solar panels have been more than enough. He has a butane stove to use outside the van, and also a sort of polyethylene foam foil box for low-temperature low-wattage cooking inside of, astonishingly, Tupperware. He says he’s living in Santa Cruz now.
on 02024-04-05#GreatScott cheapest Arduino alternative 20¢ #video #hardware He’s recommending the Holtek HT66F002, apparently unaware of the Padauk chips, even though he posted this only three weeks ago. It’s an 8-SOP with 1kB, an 8MHz internal oscillator, 6 GPIOs, a 12-bit ADC, and a 10-bit timer, but no I²C. He needs I²C, PWM output, GPIOs, an ADC, and low-power sleep. He ended up installing some proprietary Holtek IDE and buying a Holtek programmer, ugh, and then spending a couple of days debugging Blink before figuring out that he needed to disable the watchdog. It slept at 11μA, considerably better than the datasheet number. The instruction set is unfamiliar: one accumulator, conditional skip instructions, Harvard architecture, no multiplies. They don’t document the instruction encoding. He upgraded to the 32¢ HT66F0176 to get I²C instead of trying to bitbang it, then discovered that Holtek microcontrollers only support I²C in slave mode, so he’s going to try the 50¢ ATtiny402. Some Holtek μCs are under 10¢. (Oh, and apparently JLCPCB will be offering multicolored PCB silkscreen now.)
on 02024-04-05fake billboard #stealth-camping #video #toread
on 02024-04-05“easiest free street-lithium yet” #bigclive #hardware #video about disposable cylindrical “blu” vapes with 16300-sized #lithium-ion cells of 520mAh, 13g, 1.92Wh, that drop right out when you unscrew the endcap, with coaxial contacts on one end. It looks a lot like an electrolytic cap.
on 02024-04-05#3D-printed metal vs. CNC #manufacturing #video #toread
on 02024-04-05“the original warrior energy bar” #cooking #video a Georgian preserved sweet called “churchkhela” (ჩურჩხელა) made by boiling down grape juice, adding flour, and then dipping a cord threaded through nutmeats in it, somewhat like a dip candle, then dried in the sun.
on 02024-04-05“black powder from charcoal and waste oil” (nasty used cooking oil from Abigail’s Jeep Joint food truck, and then used engine oil). #materials #video They’re using the oil to fire a 200ℓ oil drum with a charcoal retort in the middle. I like the blower design: an axial blower (maybe a microwave oven fan?) stuffed into a two-meter-long galvanized 100mm stovepipe to keep it two meters away from the fire, with an elbow at the end to stop thermal radiation. The barrel design was not optimal for burning the oil, but an old blanket as a wick helped. The air inlet must have been further off the bottom than it looked for the oil to pool in the bottom of the drum instead of running out the air inlet. Despite the #clickbait title, they also used potassium nitrate and sulfur.
on 02024-04-05“what they don’t tell you about life in India” hour-long #documentary #video from 02012. First, the life of a young goldsmith or gold sweeper from Agra who has moved to Kolkata to seek his fortune, sweeping trace amounts of gold off the street where the other goldsmiths wash, paying 200 rupees per person in rent. Then, the life of some fenugreek farmers in squatters’ shacks on a municipal beach in Mumbai, and their children going to school, and their underground pub which serves only rum, until the municipal government bulldozes the settlement, which the residents rebuild the same day. There’s a sluicing plant on the banks of the Ganges which refines the sludge the gold sweepers retrieve from the drains. One of the goldsmiths considers moving to a rented room nearby which costs 2000 rupees a month, but it’s too expensive, until he finds a sludge buyer who offers a better price, and he haggles the room down to 1600 rupees a month. Very informative about #poverty.
on 02024-04-05“I live 25 meters above the ground, safe place from wild animals and bears” apparently in a lashed-construction wattle-and-daub sphere, painted white over the earth tones, hoisted up between trees with ropes and a chain hoist. Armed with a backpack full of tools and a comically wide-bladed axe, Ramiz digs a shallow well in a dry creek bed, cuts saplings with a machete for his framework, and measures out a three-meter circle on the ground with a machete-sharpened stake (hammered with a rock) and plastic twine. His initial lashings use baling wire twisted tight with fencing pliers. More stakes bend the lashed saplings into the circle; more lashings add spokes. A smaller circle of stakes is used to bend four smaller circles of saplings with lashed spokes. A thrown river rock pulls twine over a tree branch some 15 meters up; the twine draws up rope, and the rope draws up Ramiz and the chain hoist, which he installs in the tree. To support the sapling armature during further construction, sapling guide poles constrain the spoked circles to remain vertically aligned, supported on the poles with wire. Further saplings bent around the outside form the convex spherical shape, held in place with more baling wire twisted and cut with the fencing pliers. The guide poles now being unnecessary, they are removed, and the rope is removed from the tree to distribute the hanging load over many points of the sphere; the chain hoist hook connects to it, and suspension is achieved. Heavier saplings across the lower large circle serve as floor joists, lashed in place with wire, and another layer of saplings at right angles to the joists serve as floorboards, also wired in place. Windows and a door are sawn. Apparently he forgot his cigarette lighter, matches, and steel wool when he packed the machete, saw, fencing pliers, shovel, comically large axe, and chain hoist, because he has to start his fire with flint and steel. He boils the nasty muddy water from his well in a steel teakettle over the fire, suspending it from a sapling over the fire with baling wire. The next day (though several days have evidently passed, enough for leaves to dry from the rain) he digs mud from a bank, brings it back in a gunny sack, and adds more of the nasty water to make a plastering mud, which he reinforces unwisely with fresh grass that will shrink rather than dry straw, making adobe, with which he plasters the interior of his sapling frame from the inside, up to knee height. Removing the spokes from the upper large spoked circle, he adds two new joist-sized saplings to make a raised bed at knee height on one side of the sphere. Then he plasters the outside with a fresh batch of adobe up to knee height, then both inside and out up to chest height. He gathers chestnuts (?) and eats them raw, and finds a coral fungus he had carefully placed on the bank previously, which he roasts on skewers over a campfire. Rain comes again without a roof; he makes do with a disposable raincoat as he makes more adobe. Eight more saplings lashed up with baling wire form a crude ladder, permitting the plastering of the roof with adobe from outside; he later daubs adobe on the inside as well, and also plasters the floor with it, a choice which seems suboptimal to me. Vinyl sheeting in the window and a door made of more lashed-together saplings complete the sphere, which at this point has somehow come to rest off the ground on a new sapling circle wired to a circle of stakes, perhaps having permitted the plastering of the bottom. Another crude ladder affords access to the door, which is by now a meter and a half off the ground. Inside he covers the adobe plaster with shiny green cloth he apparently brought in his backpack. Many more short sapling sections, stripped of their bark by the machete, rest on the bed joists to form the bed itself, lashed down to the joists, but this time with the plastic twine rather than wire. Evidently weeks or months have passed, and dry leaves impede his access to his adobe bank, but he digs more mud to make a fireplace on top of the green cloth, which he has evidently also used to cover the floor, stapling it in place all along various the saplings with a staple gun not shown. Twigs bent into arches support the mud of the oven, and somehow or other he also formed it into a chimney; perhaps a metal pipe is hidden under the clay chimney. A metal lid over a round hole in the top of the oven serves as a stove burner. The chimney is routed up the wall and through a round chimney hole, like for a stovepipe. He gathers black berries in a tin can and smushes them up, then uses fern leaves to paint the adobe with them; somehow they color the orange adobe white, or a light lavender, so perhaps some slaked lime got added along the way. By hoisting the house up higher with the chain hoist, he can even paint its bottom. Charcoal serves as black pigment to paint his name and YouTube channel name on the outer wall. By dangling his legs out the door he can reach the hoist chain to lift the house far off the ground. Off in the woods one day he spots a gorilla; in a panic, he lifts the house back off the ground. At the end of the video he finally attempts to use the comedy axe but doesn’t know how. #stealth-camping #video
on 02024-04-05“10 years after he lived in a train tunnel” #stealth-camping #video #toread
on 02024-04-05“meet the mole people living beneath the Las Vegas Strip” #stealth-camping #video #toread
on 02024-04-05“inside [Carlos’s] amazing home in the [Freedom Tunnel] beneath New York”. He had heat, electricity, computers, refrigerators, and a microwave, and lives on food discarded by supermarkets; he’s converted a former sewer into a comfortable, clean house, maintaining cleanliness with a no-shoes policy. He had to bring in water in jugs. “The [homeless] shelter is a very, very wicked place. (...) Drugs, fighting...” Later the authorities kicked him, and everyone else, out. #stealth-camping #video #underground
on 02024-04-052 nights extreme cold #stealth-camping in the city #video #toread
on 02024-04-05McDonald’s Drive-Thru #stealth-camping #video #toread
on 02024-04-05U-Haul #stealth-camping in the cold #video #toread
on 02024-04-05hammock #stealth-camping under a bridge #video #toread
on 02024-04-05police station #stealth-camping in hammock #video #toread
on 02024-04-0512 best #bushcraft projects #video: mug carved with a Dremel from a cow horn (which becomes flexible at 110° from the heat gun) with a bottom cut from wood sealed in with food-grade epoxy, degassed with a blowtorch (“Bushcraft”?); restoring a garage-sale axe by stripping and revarnishing the handle and then riveting together leather into a sheath, sealed with boiled linseed oil; forging a flint striker from a car leaf spring (so it can be quench-hardened) cut with an angle grinder; etc. #toread
on 02024-04-05alone overnight in a traditional Navajo hogan #video #toread
on 02024-04-05I Survived a Night in America’s Last Lawless City (drug problems and daily sheriff arrests for them) #Slab-City #video #clickbait
on 02024-04-05#Slab-City, California: Last Free Place in America? (Extraordinary Place Documentary) | Real Stories #video #toread
on 02024-04-05Inside #Slab-City, The Lawless city in the Desert | Last Free Place In America #video #toread
on 02024-04-05homeless man moves into his pop-up shelter #stealth-camping #video. He built a tiny pentagonal house, sort of like a doghouse, out of discarded (insulated steel-skin plastic-foam sandwich panel!) garage-door segments, with a diesel generator, LED lights, a solar panel, etc. He adds a 20ℓ bucket toilet at some point. “Jim”, homeless six years, moved in, and was interviewed for the video. The YouTuber offers Jim to stay as long as he wants, but gets somewhat annoyed about “garbage everywhere”, and then Jim moved into a hotel.
on 02024-04-05sleeping in a war-style trench #stealth-camping #video #toread
on 02024-04-05#faircompanies building Quonset hut bunker villa #video #toread
on 02024-04-05#stealth-camping in a rather tiny, noisy traffic circle (“roundabout”) in Canada, but with bushes; too small for a tent or hammock. He enters camouflaged in a retroreflective safety vest with his gear backpack in a fluorescent orange garbage bag. Countersignaling FTW? After crawling into the bushes just before sunset (while apparently carrying a giant camera on a selfie stick), he hides the high-visibility stuff and lays out a gray ground sheet and bright turquoise sleeping bag, which he turns inside out to display the gray side instead. He gets a scare when one of the police cars and “community safety patrols” constantly passing parks nearby when he goes out to look around. He doesn’t wake up until after sunrise, despite a low of 6°, and he got lucky in that the sprinkler system didn’t go off. #video
on 02024-04-05“he lived 25 years in a train tunnel” #stealth-camping #video Walter Wengert, Jr., in the Freedom Tunnel in New York; he built himself a tiny but comfortably-decorated house high up in the wall of the tunnel, letting down a long ladder when necessary. Walter has poor taste in video player software, running Windows Media Player on his computer instead of something decent. He makes his money by rebuilding computers he finds out on the street and reselling them, selling used books, recycling aluminum cans (“going canning”), etc. This interview is maybe from 02008. He says that because his house is built into the superhighway, it’s under the authority of the Department of Transportation, not the railroad, so the railroad people haven’t been able to evict him because they have no authority over his house. He died in 02012.
on 02024-04-05salvaging old computer crap #hoarding #hardware #video #toread
on 02024-04-05#electroplating with gold after #3D-printing #video #manufacturing #toread
on 02024-04-05#manufacturing an LCD #hardware #video #bootstrapping #toread
on 02024-04-05DIY metal #3D-printing with a TIG welder bolted onto an Ender 3 by #Cranktown-City. He does successfully TIG-print a watertight vase after enough work. This worked much better than his previous MIG printing, but it’s still blobby, and he has layer shifts as if from missed motor steps. #video
on 02024-04-05#Primitive-Technology natural-draft iron smelt #materials #bushcraft #bootstrapping #video with a 1.5-meter-tall 250mm-inside-diameter mud furnace built over the course of a week with four or eight tuyeres; only got a few grams of iron
on 02024-04-05#Sanladerer Peopoly Magneto X printer #3D-printing #video It uses linear motors with closed-loop feedback (from a magnetic-strip DRO) for the X and Y axes, though still using leadscrews for Z (four of them, on steppers, moving the bed; the independent steppers allow it to do auto-bed-leveling using something like a load cell in the toolhead). It is large and heavy. The main controller is a Pi Zero2-1GB (which you can see booting Linux on the 7-inch micro-HDMI touchscreen), and then Klipper Adapter V1.0 I guess for the real-time electronics, and an ESP32 board that talks to the motor drivers over RS-485. The main motor control board is Bigtreetech Octopus Pro, which drives a couple of custom boards with big MOSFETs for the linear brushless motor drivers. He had to do some minor repairs with his lathe to get the bed leveling to complete. It did 64-point “mesh bed leveling” for bed height compensation, which found errors from -0.15mm to +0.11mm. The printhead has two fans blowing onto the workpiece through shrouds on opposite sides and another larger fan blowing air through the heatsink in the cold zone of the extruder. He crashed the extruder into the print bed, damaging the printer, wishing for “software endstops”. He had some problems with extruder flow control and underextrusion, while top solid surfaces were overextruded.
on 02024-04-05digging a Japanese #spider-hole and sleeping in it, 45' #video #stealth-camping Demonstrates how the right-angle mode of an entrenching tool is more effective than a traditional shovel for removing dirt from the bottom of a foxhole. They seem to have started (pre-filming) by clearing pine needles away from the whole area so they can cover up their digging with them when they’re done, using pitchforks. Apparently the actual Japanese term is 蛸壺, takotsubo, octopus pot; “spider hole” is from the US Civil War. Two people digging for the entire day were able to get the vertical 1.7-meter-deep shaft done, though I feel like they were being rather generous with its horizontal dimensions. To shore up the roof they’re using square-cut “2×4” and “4×4” hemlock (which I thought was pine) which they then sawed to length for “cribbing”, using very simple post-and-lintel construction, with the posts being the 2×4s. The mosquitoes chased them down the hole, and kept coming down the hole all night; a bug net for their heads would have been useful. The horizontal tunnel with its floor 1.7 meters deep is tall enough for the YouTuber to squat in; he knows how to squat even though he’s Canadian. Some fungal growth is visible on the timbers, which seems like it could be a problem. After four days of digging they were just about complete with their unsupported 1.7-meter vertical shaft and 2-meter horizontal shaft. They nailed 13 parallel 4×4s together into a square wooden manhole cover, then cut a recess into the dirt around the hole to support it. Square-cut 4×4s are really 4 inches, so this is 1.3 meters wide, and the hole maybe 0.9 meters wide. Then they cut a small “access hole” in the middle of the panel, three 4×4s wide (305mm) and a few times longer than that, dimensions he later wishes had been slightly larger. Once he’s holed up in his hole, he demonstrates using a flint and steel to strike sparks, and then demonstrates the use of a portable folding stove to heat up a can of beans. Later on they punched some holes in the manhole cover for ventilation. Full of military fantasies.
on 02024-04-05Reinforcing #3D-printed plastic parts (in this case a PETG axe handle) with stainless steel window screens, which have enough space between the wires to allow interlayer bonding. Probably around here fiberglass is the best option. He cut the screens to size but not shape with tin snips, then trimmed them after printing with the kind of small diagonal cutters used for trimming through-hole leads or zip ties. I thought maybe he would put them in between all the layers, but he seems to have stuck to just a single layer on the bottom, another on the top, and a totally useless one in the middle. For final trimming he resorted to dremeling off the wires with a cutoff disc, eventually deciding that’s just way too hard to make it safe to handle. #manufacturing #video
on 02024-04-05Fred Rash’s electric circle plane #flying #video #engineering using a 10mAh battery and a tiny propeller. It’s carbon-fiber rings, polyester film stretched over them, and balsa wood. No control surfaces, I think. The video has it flying around inside a roofed football field; the battery lasts a couple of minutes.
on 02024-04-05Japanese alcohol soldering blowtorch #video #toread #manufacturing
on 02024-04-05#Fraser building a lampwork blowtorch #bootstrapping #manufacturing #video shows different oil lamp designs. He’s going to use a bellows and a check valve with a balloon reservoir I guess? Sort of like a pneumatic buck converter. Probably doesn’t have a bladder to use. Before he gets into #glassworking he demonstrates soldering copper with it. He’s using a check valve explained by Faraday, using a latex diaphragm similar to a bicycle Dunlop valve, though Faraday used cloth. He decided to use an (99% isopropyl) alcohol lamp instead of an oil lamp to get higher power and less smoke. On the fifth attempt he succeeded at sealing a test tube into a Hermetically sealed ampoule.
on 02024-04-05salvaging things from an old computer detailed #electronics dissection of a CD-ROM drive, extracting the head, the plastic gears, the ground dowel rail, the stepper leadscrew, and the brushless spindle. He hooks the spindle up to a power supply and sticks a propeller on it. Without a propeller he gets it up to 16000 rpm according to his laser tachometer. From the computer he also recovers a CPU cooler, the ATX power supply, a piezo buzzer, a power LED, and a floppy drive. He removes the connectors from the power supply but fails to look up what some of the wires are for, although he does somehow look up the use of the “turn on” green wire. Amusingly, his test for the 12-volt line was the same as mine: a car headlamp bulb. He charges a couple of 1.5-volt rechargeable AA cells (1100mAh) with the 3.3 to 5 volt difference, which I guess is pretty safe for Ni-Cd or NiMH cells. But then he inadvisably charges some bare lithium-ion cells with the 5-volt line dropped down to 4.4 volts with a series diode. Then he hooks up a 22-amp 12-volt DC motor to the 12-volt lines with a larger propeller, and then a 24-volt brushless motor (maybe salvaged from a printer) across the ±12V lines. Then he runs a 36-volt ebike motor from the ±12V lines. Then he charges a 12-volt lead-acid battery from the -3.3V and +12V lines with a diode to drop the voltage a bit. From the floppy drive he salvages the #brushless motor but can’t figure out how to use its driver board, so he hooks it up to an external ESC, the same one he used to drive the CD-ROM spindle motor. In order to desolder its windings he turns down his old soldering iron tip on a lathe. (I don’t remember having previously seen someone heatshrink tubing with a soldering iron.) The floppy drive motor goes 6000 rpm at 17V and 14000 rpm at 19V. #hoarding product-shill #video #hardware
on 02024-04-05#Rinoa runs her 1920s Lenk Duplex Automatic Alcohol Blowtorch No.175 for the first time. #video #manufacturing
on 02024-04-05homebuilt spectrum analyzer #hardware #video #toread
on 02024-04-05megaphone amplifier #hardware #electronics. A grounded-emitter amp (with no emitter degeneration!) with an 0.1μF cap on its base to a microphone feeding an emitter follower. Lots of talking-head filler. Didn’t bother to finish. #video
on 02024-04-05dancing cactus #teardown #video showing the potentially salvageable microcontroller #hardware
on 02024-04-05#Electronoobs One axis PID encoded DC-motor leadscrew #control using triangular allthread or a decent leadscrew. But he doesn’t talk at all about PID tuning or backlash or preload, just super introductory stuff. #video
on 02024-04-05Hantek LCR meter #hardware #metrology #video
on 02024-04-05Mod-01 Lec-37 Battery-Driven System Design (probably low-power stuff) #hardware #video #toread
on 02024-04-05Schottky diode bench testing #hardware #video but he seems to be measuring the time for the junction capacitance to discharge through a 220Ω resistor into a microcontroller output and confusing that with reverse recovery time?
on 02024-04-05“Amazing” #hardware Projects From Old Scrap Circuit Boards. Fake, removing components from salvage boards with tweezers without desoldering them. First project is an uncredited, unexplained Joule Thief cellphone charger that produces too-high unregulated output voltage (one commenter said, “When I plugged this into my phone everything blew up.”). Second one is a shitty high-distortion class-A darlington amp for an 8Ω paper cone speaker consisting of two NPN power transistors from a compact fluorescent lightbulb, a 220μF cap, and a 330Ω resistor. Still, he’s doing some cool #ghettobotics stuff with almost no materials or tools. By “Creative Goutam.” #bootstrapping #hoarding #video
on 02024-04-05#EEVblog how to set up an electronics #hardware lab #video
on 02024-04-05#Bushcraft Filipino guy smelting iron into a fishhook #bootstrapping #video
on 02024-04-05Battery less power supply and battery life calculation for embedded devices #hardware #video. An hour-long NPTEL lecture on “Design for the Internet of Things” from the “Indian Institute of Science” (?) in Bangalore, by T. V. Prabhakar. Seems like it might have a lot of talking-head footage, but there’s also some handwritten notes, Khan-Academy style. He’s explaining how batteries have lower efficiency at higher current draws; how ZigBee, Wi-Fi, BLE, LoRa, SigFox, NB-IoT, LTE-M, increase power draw; etc. He thinks you should design your systems for “!10 Years!”, which implies up to about 4μA of sleep current (for your radio, I think). He suggests buffering your batteries with capacitors (just in parallel with the battery) to improve battery efficiency by reducing the current spikes the battery has to cope with. Discusses self-discharge/internal leakage: some batteries are 0.5% per month, and shelf life is defined as the time until it falls below 80% of nominal capacity. He seems to have a very narrow definition of “IoT” of just sensor nodes transmitting sensor data back to an “aggregator” gateway. He says that, in the IoT world, sleep power consumption is time and time again the most significant power consumption, but still smaller than battery self-discharge.
on 02024-04-05how to make a quill pin and draw with it, including tempering feathers etc. #bootstrapping #video
on 02024-04-05SciPy 02020 BoF on driving hardware for instrumentation (HPIB, stuff like that) #hardware #video #toread
on 02024-04-05#video from 02015 by "fullspectrumtechnician3798" on salvaging #microcontrollers for #hardware #electronics projects. Socketed DIPs are easiest to remove from the equipment. Old computer printer boards are one of his examples; he exhibits one with an UV-erasable 8748, which you can also “enable the external access” (I think this is pulling the EA pin high, maybe pin 7) to make it run a program from external ROM/RAM. He also exhibits what looks like a Packard Bell full-length ISA hard drive controller, saying, “normal Winchester drive controllers, pretty much all of them will have either an 8048 or 49 or 8051, usually...labeled, like, Winchester, something like WD1015.” He demonstrates one thus salvaged and hooked up to an external EPROM. Then he exhibits a full-height 5¼ IDE hard drive, saying they usually have an 8051, but this time he’s pointing to something like a PLCC. Then he exhibits an ISA modem card, which he says pretty much always has a microcontroller. He says the Winbond 78C31B on that modem is an 8051 (and therefore also has EA). “Some network cards like this old [ISA] LANTastic have a Zigalog Z80... luckily the serial chip, the RAM, and the CPU are all socketed.” Then he exhibits an old (01980s) UPS control board with a Philips 87C52E socketed DIP, which is another 8051. He says the MC6800 series is also useful even if preprogrammed, by using the “special functions” pins (?) to “tell them to boot off of an external ROM”. Though the one he shows is UV-erasable. Holding up a PLCC chip, he says hard drives, especially Western Digital, use the Intel 80C196 style, which is 16-bit but still has the “external access” pin. And he says keyboards often use the NEC D8048-8C, which is of course an 8048. #bootstrapping #hoarding #video #scouting
on 02024-04-05#video from 02015 by "fullspectrumtechnician3798" on salvaging #microcontrollers for #hardware #electronics projects. Socketed DIPs are easiest to remove from the equipment. Old computer printer boards are one of his examples; he exhibits one with an UV-erasable 8748, which you can also “enable the external access” (I think this is pulling the EA pin high, maybe pin 7) to make it run a program from external ROM/RAM. He also exhibits what looks like a Packard Bell full-length ISA hard drive controller, saying, “normal Winchester drive controllers, pretty much all of them will have either an 8048 or 49 or 8051, usually...labeled, like, Winchester, something like WD1015.” He demonstrates one thus salvaged and hooked up to an external EPROM. Then he exhibits a full-height 5¼ IDE hard drive, saying they usually have an 8051, but this time he’s pointing to something like a PLCC. Then he exhibits an ISA modem card, which he says pretty much always has a microcontroller. He says the Winbond 78C31B on that modem is an 8051 (and therefore also has EA). “Some network cards like this old [ISA] LANTastic have a Zigalog Z80... luckily the serial chip, the RAM, and the CPU are all socketed.” Then he exhibits an old (01980s) UPS control board with a Philips 87C52E socketed DIP, which is another 8051. He says the MC6800 series is also useful even if preprogrammed, by using the “special functions” pins (?) to “tell them to boot off of an external ROM”. Though the one he shows is UV-erasable. Holding up a PLCC chip, he says hard drives, especially Western Digital, use the Intel 80C196 style, which is 16-bit but still has the “external access” pin. And he says keyboards often use the NEC D8048-8C, which is of course an 8048. #bootstrapping #hoarding #video #scouting
on 02024-04-05David Greenberg’s "Hitchhiker Tree" data structure #algorithms #video
on 02024-04-05salvaging motors from floppy disk drives #hardware #bootstrapping #hoarding #video He doesn’t manage to nondestructively disassemble these NEC floppy drives; he suggests making a nut for their leadscrews by twisting some wire, which seems like it ought to work. Rather than trying to use the flat-flex cables, he solders directly to the motor pins. Demonstrates crimping Dupont pins onto the wires he soldered onto the motor. Then he wires them up to a couple of DRV8825 stepper driver chips and an #STM32 Blue Pill. Running them on 9 volts with a 100% duty cycle they got up to 90° (according to his thermocouple) and started to smell, for which he suggests using a different driver board called the “EasyDriver”. He uses Arduino’s LiquidCrystal_I2C.h to talk to his 16×2 LCD.
on 02024-04-05#Bushcraft Filipino guy #Primitive-Life smelting iron to make a knife from natural materials, and I think Roman cement too. Lashes members to live trees to make a hut, which greatly simplifies climbing (no tripod needed). Early footage was originally shot in an interlaced format (1080i?) before upload to YT. This guy seems like he might be the real deal; no steel saw marks or backhoe marks visible. Bamboo is a huge win for cutting difficulty vs. stiffness, especially for drilling with stone flakes and for splits. Makes a green bamboo chair and table; holes drilled in bamboo enable a sewing-like lashing technique to secure butt joints, but lacking diagonal braces results in undue stress on lashed joints. Uses ground-squatting technique. Grass hut permits indoor work in the rainy season. Tropical climate permits outdoor work in rain. Fishing lines provide food to cook on spits over fire to serve on leaf plates. Bamboo water vessel permits boiling water next to fire; requires towel to grip. Firestarting technique not shown. Bow and arrow demonstrated. All that was from 02017. In 02018, river rock path and brick masonry well shown. Bamboo latticework fencing is built to protect what looks like a chicken coop. A score sawn with a stone saw around green bamboo facilitates clean breakage. In addition to celt axe, lashed-head stone axe is shown to split bamboo. Bamboo caps fit tightly onto bamboo pipes or other vessels with appropriate choice of diameter, making a nearly watertight seal. A gourd-bucket dipper on a bamboo handle is used to draw water from brick well with protective cement roof supported on wood rafters. Ramrods are used to break out internal partitions in long bamboo to make a long vessel. Stone saw is wedged into split-wood handle which is lashed tight to provide better handling. Some yam harvest is on floor; perhaps more is in large wicker and lashed-bamboo baskets. Hand drill is used not for firestarting but for drilling a round hole in large bamboo (side or partition); stone point lashed into split end improves drilling action. Split bamboo vessel permits melting adhesive (pine pitch?) over fire with charcoal filler; poured over bamboo–bamboo joints of small bamboo fit into round hole drilled in larger bamboo, it yields watertight joint seals for automatic vacuum-controlled trough for watering chickens. Chicken coop seems to be adobe (or, more likely, wattle and daub) with narrow latticework bamboo doors and windows, perhaps to keep out varmints; the door hinge is a round vertical member of the door in a round hole. Bamboo trowel facilitates plastering with adobe to hold trough in place atop bricks inside chicken coop. All that was 02018. He’s got an awful lot of bricks that look awfully gray, including what may be a water tower, and this video doesn’t show making them; these may be cheating. Bamboo rake serves to gather dry forest litter. Roof thatching clamped into split bamboo is shown; a smelting shelter with thatch but no walls has large river rocks around the edge of a raised floor made from red clay brought in in wicker baskets, then tamped down by beating with poles. Fire pit in floor is built up with adobe; flexible paddle hand fan (a cut banan leaf?) fans fire. Adobe grille over fire (presumably to permit eventually moving the fire on top of it so it can get fed with air from below) is initially supported by bamboo rafters. Yes; charcoal fire on top of grille is shown later. Then he uses actual anthracite coal for a smelt, which is possibly also cheating, but smelts many grams of iron. He seems to mixing the iron ore with some kind of a flux as well as crushed charcoal. He has a gazebo made of masonry with river rocks with gray mortar that must be close to a tonne; it’s unlikely he’s made that from wood ash! Fresh banana leaves serve well to support clay discs as they are rotated and moved from place to place. A second smelting furnace of a similar design is built next to the first. Severe cracking in the first suggests no fiber was added to the adobe, and too much clay. A conical hole is drilled in a river rock with another rock; the appearance of the dust suggests that the drillee is marble or limestone. The clay discs are wood-fired in the second furnace. A drill bit is ground onto the end of a stone and lashed into a split bamboo rod. A centrifugal blower similar to the Primitive Technology design, but using a split bamboo shaft, is installed in the floor to blow both furnaces, using the conical hole as a bearing, resting on a ground stone point. The fired clay discs are used as blower cover and flywheel; the fan shaft is driven with a pullstring mechanism similar to a yo-yo, with a bamboo pull handle on the end of twine. A second smelt also produced iron. Later a horizontal chimney extension was built (not shown) supported on a river-rock masonry wall with adobe mortar, perhaps in order to be able to cover the top of the furnace. A skimmer apparently made from wicker or a tiny lashed bamboo lattice serves to remove floating debris from the water in a clay decantation pit; levigated clay is removed off the top with a pottery dipper, which seems to be fired from a white ball clay or kaolin, neither of which I’ve seen him dig. The dipped-out orange clay is decanted in a pot to get a smooth, pure, highly plastic clay (with a lot of contraction on drying). He seems to be firing it without any temper! But, miraculously, the pieces survive; these are his crucibles and molds for trying to cast what looks like hundreds of grams of iron prills into a knife, edge down, and a chisel. Unbelievably, this does succeed, and he grinds them sharp on a rock afterward, a huge upgrade for his woodworking. Further heating in an anthracite forge made of river rocks enables some forging, using split-bamboo tongs and rocks as hammer and anvil, forming a tang that permits the attachment of a handle to the iron knife with the pitch-like hot-melt adhesive; the iron knife edge can shave bamboo. All this was in 02019. In 02020 his grass hut had fallen down, but at some point he had built a masonry pool or cistern next to the well. He makes a straw-style broom from bamboo splits using the new knife. Finally at 54'35" he shows #firestarting, with a hand drill and pine needles; he’s using a sharpened wood stick. He removes two trees by building fires at their bases, then pushing them over with a long pole. At this point he’s removed the thatched roof over the smelting furnaces; he repairs their cracks a bit with more adobe. Two wicker carriers suspend wicker baskets from a pole over his shoulder, permitting him to carry a greater load of river rocks back from the river. He breaks up a lot of big limestone rocks and burns them to quicklime, which he uses in a heap of sand (brought in in baskets) to make mortar to build a stone house from river rocks, so maybe all that cement I saw before wasn’t cheating, but that mortar sure does look a lot more like portland cement than it does like lime mortar when wet; but it seems to set pretty white. He makes a third celt-like axe, this time with half a bamboo bent double around the head before lashing tight. Splitting a log with stone wedges and wood stakes is a lot of work. A ground-stone wood chisel (much wider than his iron chisel) is surprisingly precise at surfacing wood, raising quite a respectable shaving, and between the two chisels he cuts some quite respectable mortise and tenon joints for the stone house’s doorframe. Doorframes, plural. He builds a third furnace from the materials of the first two to burn still more lime; when the stone walls are finally done, they have peaks for a pitched roof and notches in them for rafters. Over a packed dirt layer for the floor he lays lime mortar, surfaced it with large river rocks. For troweling the mortar flat before adding the stones, he uses a stone trowel. Bamboo bars in the windows are evidently designed to keep large varmints out, held in place with lime mortar, stones, and lashing. He gashes several pine trees at the base with the bamboo “celt” to produce pine pitch, placing palm leaves to collect the pitch. Young hardwood logs are mortared in place atop the stone walls as rafters. He chisels a round hole in the doorway’s threshold, and a corresponding one in the lintel, for a hinge. After harvesting and splitting numerous three-meter bamboo poles, he pounds the splits flat, then weaves them into several three-meter-square mats. Combining the tapped resin, foraged resin, and pounded charcoal, he makes his glue again, this time in a ceramic pot on a three-stone stove, and paints it onto his bamboo roof panels to be installed in the lower layers of the roof before installing them on the roof, perhaps to stick the layers together. #video (99 minutes long)
on 02024-04-05#Tech-Ingredients high-emissivity paint for their #cooling panels. Yes, it’s barium sulfate. #video #toread
on 02024-04-05sharpening a knife with cigarette lighter wheels? #machining #video he basically nails two of the hardened file rings from the middle of the wheels onto a board and drags the knife between them, using them as non-rotating files. Then he demonstrates cutting paper with the burr.
on 02024-04-05sharpening a knife with spark plugs #machining #video #toread
on 02024-04-05sharpening a knife with a spark plug #machining #video demonstrates terrible knife technique on a tomato. Horrible elevator music. Then demonstrates obviously #fakenews #misinformation sharpening technique using the gap between two jam nuts on a bolt chucked up in a drill. Then demonstrates “sharpening” a different knife, evidently freshly sharpened on a grindstone, on the bottom of a ceramic mug, a technique which can work, though probably not with the movement demonstrated. ("Creative Hacker" gets killfiled!) Then a third knife, already evidently fairly sharp, finally demonstrates the supposed sparkplug technique: the plug is held in a vise to be hacksawed through the metal part, permitting the separation of the sintered sapphire insert, which apparently has an unglazed section where the metal covered it, which is used with the same ineffective movement to sharpen this third knife.
on 02024-04-05restoring and sharpening an antique file #machining #video #toread
on 02024-04-05restoring rusted files #machining #video starting with cleaning the teeth with an X-Acto knife, one tooth at a time, and steel wool, and denatured alcohol, and a file card. Then he uses electrolysis to remove the actual rust with sodium carbonate (half a cup in 5ℓ of water). He just used a 12-volt battery charger at about 3 amps for 4–8 hours. Then he had to clean the teeth again. Then he used acid etching to sharpen the teeth, because (he says) it works better than electrolysis, overnight in a bath of vinegar, a liter of 4% acetic acid, which he later neutralizes on the files with baking soda. Then he polishes with scotch-brite and protects with WD-40.
on 02024-04-05sharpening dull files in acid #machining #video apparently vinegar for 8 hours or sulfuric acid for 40 minutes sharpens dull files effectively
on 02024-04-05#Blondihacks on making filing buttons for hand filing #machining #video
on 02024-04-05hand filing for blacksmiths #machining #video recommends buying NOS (new old stock) files rather than new Nicholson ones that have been outsourced to Brazil or Mexico; thinks maybe new Grobet files from China or India might be okay but hasn’t tried them.
on 02024-04-05#Clickspring on hand cutting precision file teeth. Nothing especially precision about the teeth; they’re just eyeballed. #machining #video
on 02024-04-05how 19th-century files were made #manufacturing #video by #Ken-Hawley, MBE, died 02014
on 02024-04-05hand-forged file #machining #video #toread
on 02024-04-05basics of filing #machining #video quite good
on 02024-04-05Make magazine on hand filing #machining #video worthless, not worth watching at all
on 02024-04-05#Fireball-Tool whether hand filing backwards is bad or not #machining #video #toread #todelete
on 02024-04-05hand filing 101 #machining #video Lots of time-wasting video of text and 3-D animations with some dumbfuck reading a script very, very slowly over it, while astoundingly shitty music plays. Does contain some actual information, but no actual tutorial content, despite the misleading video title.
on 02024-04-05#Prelinger archive on “fundamentals of” hand filing from 01942 #machining #video #toread
on 02024-04-05#Clickspring 8 tips on hand filing #machining #video #toread
on 02024-04-05illusions (and optical tricks): astigmatic blur, barrier-grid animation, the Ponzo illusion, etc. #video
on 02024-04-05#bootstrapping a plasma cutting machine from scrap (if your scrap includes an old welder and a humongous full-bridge rectifier etc.) #video of this Italian guy kludging all kinds of crazy things together, building a giant high-current inductor, etc. Also he starts with a plasma torch.
on 02024-04-04switched reluctance motors #video of nearly just a talking head. Though #Akio does spin his motor by hand a bit
on 02024-04-04a magnet that attracts aluminum and copper #video #toread
on 02024-04-04absorption of water by hydrophane opal #video #toread
on 02024-04-04salvaging printers #hoarding #video #toread
on 02024-04-04#LudicScience #video on useful parts from an old printer, a Samsung laser. Kind of clueless. It makes me cringe seeing him poke the first-surface mirror with a screwdriver, and he erroneously claims the mirror-spinning motor is a stepper. #hoarding
on 02024-04-04#SunShine accidentally made an e-bike by #3D-printing; apparently he just drives the rear rim with a 3-D printed helical gear driven by a drone motor held in place with some T-slot aluminum extrusions. #bicycles #video
on 02024-04-04generating 100Vdc with a Cockcroft–Walton voltage multiplier. #Video has a very nice 3-D display of the schematic where voltage is represented as elevation! Unfortunately very introductory.
on 02024-04-04a video about cashconverters #video #toread
on 02024-04-04“this #RISC-V cyberdeck is not for you.” Sponsored product review #video on the Sipeed Lichee Console 4A which can play YouTube in 480p and has gigabit Ethernet, despite being ten times slower than tiny Intel netbooks. 1280×720. Clitmouse. 600 grams. Touchscreen. Webcam. You can type on it faster than an iPad. Quad-core #T-Head C910 processor (TH1520), underclocked to 1.5GHz. 4.4 gigaflops. GPU is Imagination PowerVR, with performance similar to the Raspberry Pi 4.
on 02024-04-04opal mining in Nevada at Royal Peacock #video #toread
on 02024-04-04salvaging printer parts #hoarding #video. No words, by Salvadore Tartaglia; full video on his Italian channel. He disassembles a Brother all-in-one scanner/printer, but doesn’t really explain what the parts are for. There’s an optical encoder wheel on the paper feed and a belt driving the carriage from a DC motor, which I think has an optical encoder tape that isn't shown clearly. He thoughtlessly rips off the optical encoder wheel and discards it, apparently unaware of its significance.
on 02024-04-04#EEVblog photocopier teardown #hardware #hoarding #video #toread
on 02024-04-045V regulator design #tutorial #hardware #toread #video
on 02024-04-04#EEVblog teardown of a CCD scanner array from a fax machine. He mentions at about 2’20" that people complain when he pronounces “LEDs” as [lɛdz]. Most of the video is microscope footage. There’s a massive array of tiny lenses which he describes as “kind of like an optical zebra strip”, which seems fair, but it turns out it’s called a “rod lens array”; the lenses are something like ten times as thick (5mm) as they are wide (0.5mm?), so presumably what they’re doing is putting a virtual image of the page very close to, or on, the CCD itself. The 25 or so transistors attached to each pixel of the sensor array makes me wonder if it’s maybe actually a CMOS sensor rather than a CCD, since a CCD can serve as its own shift register. #hardware #video #optics #electronics
on 02024-04-04introduction to contact image sensors like from scanners #hardware #video #toread
on 02024-04-04VitalFluid plasma activated water #video #toread
on 02024-04-04Alan Zhang’s DIY electric VTOL “flying car” #video looks like a small car, sure. 8 2-bladed propellers at the corners. Apparently #eVTOL is a thing now. Carbon-fiber-reinforced plastic tubes connect through FDM-printed joints to form an unnecessarily floppy frame. Doesn’t work yet, not enough structural integrity.
on 02024-04-04#GreatScott build an HV generator. His HV transformer has a low-voltage feedback winding on the primary side which he uses to turn on an NPN BJT to ground, via a 100Ω resistor and a UF4007 diode on the base, which turns on the other (113μH) primary coil; apparently this makes a 19kHz blocking oscillator like a Joule Thief, but this time with a high-voltage secondary. He burned up his first transistor pretty soon by dissipating 2.8 watts. An IRF740 N-MOSFET died even sooner. So he switched to a flyback converter built around an IRF840 driven by an external square wave and a DRC snubber. He reports that above 200kHz he could no longer feel the shock, but did burn his skin. But it still wasn’t as efficient as he wanted, so he drove it with the ZVS oscillator he’d built previously for induction heating. #electronics #hardware #video
on 02024-04-04#Angelito plasma thruster (ionic wind generator) #video #toread
on 02024-04-04“DIY” ozone generator #video but he bought the power supply for US$3 on eBay, eliminating the DIY aspect. That power supply burned itself up, so he bought another one. The DIY part is that he put some stainless window steel screen into some borosilicate glass tubes and 3-D-printed endcaps.
on 02024-04-04touch-responsive plasma-filled river table #video #toread
on 02024-04-04bushcraft camping with coyotes & hunting my dinner #bootstrapping #video #toread
on 02024-04-04peligro en liniers #video #toread
on 02024-04-04DIY plasma physics power source with a 20kV flyback transformer which looks like it came from a TV set (he recommends a miniature battery-powered TV from a thrift store). Looks like he’s using the flyback transistor and heatsink from the TV too; he says MX D363 / 2N3055 but the actual Fairchild part says MJE3055T on it. Then a couple of 2-watt resistors (220Ω and 20Ω) and that’s it. The 220-ohm resistor limits the current from the 12-volt source to the base, which also runs through a feedback coil on the transformer to turn it off, allowing the 20-ohm resistor to pull the base down to ground (or rather to keep the feedback coil from pulling it too far below ground). And then the primary coil is just connected through the collector to the grounded emitter with no resistance. He recommends using an ohmmeter to find a couple of sub-1Ω coils on the transformer to ID the primary and feedback coils. This is pretty similar to a Joule Thief. #hardware #video
on 02024-04-04spark gap radio #video #toread
on 02024-04-04airline #cold-plasma ozone generator #hardware teardown #video #toread
on 02024-04-04Kirlian photography #tutorial #video #toread
on 02024-04-04“EXO CARS: The Underground Cheap Supercar Slayers” seems to show a welded-tube frame? “semi-legal lightweight performance projects cost next to nothing” #video actually doesn’t contain much more info than that
on 02024-04-04#SteveMould applies a cast saw to his skin #video Apparently new casts use a water-activated synthetic resin? But can still be cut by the same cast saws.
on 02024-04-04#bitluni made an ASIC #video. 165 designs on the chip (eFabless Tiny Tapeout 2, in 02022, US$300, from Matt Venn’s Zero to ASIC course), and he can test any of them; his design is a file of a three-frame 32×32 rickroll (512 bytes, GIF89a). He got back the chip 9 months later. More recent Tiny Tapeout runs are using much faster buses than the serial bus his chip used. Instead of JLCPCB or PCBWay he’s advertising PCB fab house Aisler in this video, who supports LCSC.
on 02024-04-04#the-Line in Saudi Arabia is apparently fixed? Explores nomadic cities. Oh, it’s a Canadian architect marketing her ideas to the Saudis. Lots of nice eye-candy of architectural visualizations, though. Too bad half the #video is wasted on footage of her face.
on 02024-04-04why Wankel rotary engines bankrupt motorcycle manufacturers #mechanical #mechanisms #video. Very nice footage from “@Warped Perception” of a running Wankel engine, then a guy riding a 27hp Hercules W2000 from 01974 West Germany and posing sexily with it on the autumn leaves. Hmm, is it true that the Nazis fired Felix Wankel for being too militant and then he became SS? Yes, yes it is. 8½:1 compression ratio, which I guess is inherent to the geometry. And the Hercules mixed oil into the fuel like a two-stroke. Oh, and apparently insurance companies classified it has having three times the 294cc displacement it actually did, 882cc, presumably because it fires three times as often. That was the first Wankel motorcycle, but then Norton bought the assets and also went bankrupt. Suzuki didn’t go bankrupt but abandoned their Wankel cycle after 12 months, he says. Van Veen went bankrupt.
on 02024-04-04diamond in piranha. #video #materials another #The-Action-Lab video, but not full of misinformation as far as I can tell. Also includes demos of piranha on a cellulose sponge and a hot dog. Diamond results: inconclusive.
on 02024-04-04can #ultrasonic waves eat metal? #video demonstrating ultrasonic cleaning and giving an introduction to acoustics. Claims that sound pressure at a given “amplitude” is proportional to frequency, but the WP article on the absolute threshold of hearing says that 20μPa = 0.98pW/m² at 1 atm and 25°C without giving a frequency, so I’m not sure what definition of “amplitude” would make this true. Displacement, I guess? Immediately afterwards, though, he equates amplitude to loudness, so I guess he’s just wrong. Also the video has lots of worthless talking head footage. By “eat metal” apparently he means tear gold leaf apart. But he says it’s “brass foil”, thickness unspecified. I guess we can relegate "The Action Lab" to the #fakenews #misinformation category.
on 02024-04-04are Chinese motorcycles taking over? #video consisting apparently entirely of stock footage with a voiceover. #Plonk to "bart".
on 02024-04-04#bootstrapping a handheld metal smith’s forge (but you can’t hold it while you’re using it) #manufacturing #video #toread
on 02024-04-04DIY betavoltaics #bootstrapping #video Chinese Betavolt Corp. is using diamond semiconductors; their BV100 produces 100μW at 3V for 50 years from nickel-63, package size 15mm × 15mm × 5mm. So Robert Murray-Smith decided to make his own out of an americium smoke alarm (1 microcurie, 37kBq, 0.3μg, working out to 6 femtoamps, with half-life of 432 years, since it’s isotope 241) and a 2N3055 TO-3 power transistor. He measures 130mV of alphavoltaic production from his decapped 2N3055 but doesn’t measure the current, but presumably it would be on the order of half a femtowatt. NurdRage’s tritium-keychain-powered solar cells (being commercialized by Arkenlight as Betalight) are much more practical, but shorter-lived.
on 02024-04-04#SteadyCraftin on how to make and use toy wax #video
on 02024-04-04#VICE on Singapore’s remote-controlled cyborg insects: aerospace engineer Dr. Hirotaka Sato and his student Cao Feng at Nanjing Techncal University (in Singapore?) are controlling eight muscles of large live beetles with wires to make them walk, and his students Li Yao and Thang are working on controlling their flight. #video
on 02024-04-04#YiZhiZhu steampunk taxidermy hermit crab #video #toread
on 02024-04-04#YiZhiZhu steampunk taxidermy #video where he seems to be modifying a Spongebob doll? Wrapping copper wire around a steel rod? Epoxying watch parts in? Hot-gluing in a laser diode? Dremeling out most of the original plastic? Vacuum tubes with UV LEDs, other electronic parts, etc. Indeed looks very steampunky. Cyborg Patrick sculpture.
on 02024-04-04CNC-cutting a precision DIY cycloidal gearbox from steel. He bought dowel pins for the rollers. And had to start over. #mechanical #video #toread
on 02024-04-04#Mikhail-Varshavski “reaction” to “extreme cheapskates” #video #toread
on 02024-04-03#Styropyro testing 01933 formulary recipes (part 4) #video including self-lighting matches, a potassium-permanganate black wood stain, and absolutely beautiful iridescent coal, carbon tetrachloride artificial fog, silvering a skull, bright blue flames, patching holes in metal with aluminum sulfide flash powder, etc. #formina #materials #humor
on 02024-04-03#Posy on Dutch fireworks regulation #video
on 02024-04-03“reaction” to “cheapest woman ever” #video #toread
on 02024-04-03#Krasnow #Applied-Science photosynthesis photography on geranium leaves, boiled in ethanol (or, better, methanol) to remove chlorophyll and then stained with iodine to darken starch. #video
on 02024-04-03#Krasnow #Applied-Science DIYing and testing a nuclear quadrupole resonance for #materials identification #video #toread
on 02024-04-03From Newton’s method to Newton’s fractal #video #math #toread
on 02024-04-03“Did people used to look older?” #video #toread #todelete
on 02024-04-03space-filling curves filing with water #video #toread
on 02024-04-03animating flipbooks under a microscope. His previous one was 12mm×5.6mm. In this video, he makes two flipbooks that are even smaller. To film them, he attaches a “microscope” (compound macro lens) to a medium-format camera. He uses “onion-skinning” in his capture software to give him a reference to the previous animation frame as he draws under the microscope. The flipbooks end up being 7.68mm×2.85mm and 5.02mm×2.35mm. #video
on 02024-04-03tutorials that went wrong #humor #video #vapid
on 02024-04-03encephalitis lethargica paralyzed 5 million people into living statues #video #toread #history
on 02024-04-03#Mikhail-Varshavski laughs at funny medical memes #video #vapid #humor
on 02024-04-03#StuffMadeHere world’s fastest wrist disc (frisbee) launcher #engineering #video. Strangely he’s using a rotary joint instead of a linear one for the disc launching, and has all kinds of trouble. 9.7 million views!
on 02024-04-03#Thought-Emporium aluminum foil and highlighter ink to make #lasers with a TEA pump #engineering #video
on 02024-04-03putting a giant propeller on #bicycles #video #toread
on 02024-04-03Fibonacci turbines. A 3-blade spiral turbine reached 48% efficiency at low water speed, much higher than a conventional propeller. The Liam F1 Archimedes turbine along these lines provides wind #energy at low wind speeds. Author “Ziroth” includes lots of talking-head filler footage. #engineering #video
on 02024-04-03Voith-Schneider and ABB Dynafin cycloidal propellers #flight #engineering #video #toread
on 02024-04-03what if Formula 1 had no rules? #video rather dull, didn’t finish it
on 02024-04-03a bear trap that can cut you in half, or cinder blocks, ballistic-gelatin dummies, cow bones, etc. #video #Backyard-Scientist
on 02024-04-03#Destin #manufacturing by progressive stamping #video at T&C Stamping in Athens, Alabama, distinguishing progressive stamping (which is of a continuous strip, and is what they do) from transfer stamping, showing hemmed edges to protect spark-plug wires from abrasion. They made 35–40 million blender blades for a company they don’t want to talk about last year, among other things. “We process, I think it’s 10 million pounds [of sheet metal] a year. (...) We’re a mid-size stamper.” I think that refers to the size of presses they operate.
on 02024-04-03#CNC-Kitchen #3D-printing with hot glue #video apparently it is possible with a filament oiler to use a regular 3-D printer hotend with EVA glue sticks ground up in a blender (after freezing) and extruded into a very floppy filament. It prints crystal clear but of course has lots of stringing. It’s very soft, like a very soft TPU.
on 02024-04-03#Andy-Ward on how to “make” clay. #ceramics #video #toread #bootstrapping
on 02024-04-03“I bought 1-star tools on Amazon.” A Wen track saw, a bad palm router, a Deko cordless drill, a Deko “random orbit” sander, a Neu Master cordless tacker, a Kimo impact wrench, mostly pretty okay. The sander came with sandpaper that couldn’t take pencil off maple, and he hated the tacker. #video
on 02024-04-03#Nighthawk making opals from tetraethyl orthosilicate in ethanol with an ammonia catalyst for “free air conditioning”? Really he means wavelength-selective coatings, but he’s confused about the physics. Gorgeous though. #cooling #video
on 02024-04-03#Andy-Ward #manufacturing an earthen oil lamp #bootstrapping #ceramics #video #toread
on 02024-04-035 more excellent ways to die arc welding at home #video #toread
on 02024-04-03top 5 ways to die arc welding at home #video: chlorinated brake cleaner (tetrachloroethylene) forming phosgene, electrocution, melanoma, catching a can of WD-40 on fire, and welding galvanized steel.
on 02024-04-03using carbide inserts in a homemade dovetail cutter #machining #video #toread
on 02024-04-03Leinen E-125 German toolmaker’s vise jaws open backwards and therefore open to 250mm. He cleans it up and restores it with NaOH soak, electrolytic rust removal, disassembly with hammers, wire brushes, a sandblaster, etc. Then he TIG-welded on what turned out to be a cast-iron casting! A grinder and a CNC milling machine with a carbide-insert face mill mostly repair the resulting damage but chip the crap out of the inserts. He repairs some casting errors in the original vise, adds copper soft jaws and case-hardened steel jaws (using charcoal and barium carbonate, botched using an oxidizing-flame furnace), fills holes with Bondo, and airbrushes glossy paint onto it. At some point he removes zinc from galvanized bolts and replace it with a black finish by soaking them overnight in vinegar. Cleans sprayed paint from screw holes with a tap. A guy from new Zealand in Vienna, I guess. #hardware #video
on 02024-04-03shiny aluminum foil ball #video by Adam Savage. He couldn’t figure out how to cut it in half. (Later he resorted to a waterjet cutter.)
on 02024-04-03squishing shiny aluminum foil ball in hydraulic press #video #toread
on 02024-04-03#dorodango #video by #emmymade, who spends nearly all of the video talking to the camera; without that filler it could have been two minutes. One part clay, one part sand, some chopped grass fibers. Sphericizes them by rotating them in the neck of a jar. She then burnishes it with more jar necks. But then she pollutes her dorodango with paste wax!
on 02024-04-03cutting shiny aluminum foil ball in half with a waterjet #video #toread
on 02024-04-03shiny aluminum foil ball #video #toread
on 02024-04-03graphite #dorodango #video #toread
on 02024-04-03#dorodango #tutorial #video #toread
on 02024-04-03#dorodango #clickbait #video #toread
on 02024-04-03spider silk guitar strings #video #toread
on 02024-04-03mythbusters were wrong about falling coins killing people? #video #toread #vapid #clickbait
on 02024-04-03#manufacturing an unnecessarily complex geared mechanical pencil #video #toread #machining
on 02024-04-03#manufacturing a springless air-powered graver #video #toread #machining
on 02024-04-03reinventing calipers with tiny sculpted brass hands and human foot and a micrometer thread with a half-nut, a quick-release micrometer #video #machining #metrology
on 02024-04-03hand-engraved metal computer mouse #video #toread #machining
on 02024-04-03#Inheritance-Machining “trying to save my busted lathe” #video #toread #machining
on 02024-04-03pemmican #cooking #video #toread
on 02024-04-03best fails of the year #video #toread #vapid
on 02024-04-03#video of a failed attempt at making a fire pit stop smoking. by feeding air preheated in a metal liner into the top of the fire (based on the Solo Stove smokeless fire pit design) to provide “secondary combustion”. He ends up trying to chink his dry-stacked brick fire pit with mortar and use a wadded aluminum foil gasket. He finally gets some smoke reduction by using drier wood.
on 02024-04-03#Mikhail-Varshavski “reaction” to true ER stories #video explaining things like anaphylaxis and thoracotomies
on 02024-04-03woodworking injuries in slow motion (40kfps) #video #toread
on 02024-04-03#TKOR cryotempering a knife #video #toread
on 02024-04-03#Ze-Frank on shrimp #humor #video #toread
on 02024-04-03the power of time #video super boring
on 02024-04-03#Mikhail-Varshavski “reaction” surprisingly accurate medical memes #video #vapid #humor
on 02024-04-03#machining a crazy (helical) part on the lathe from brass by moving a jaw on a 3-jaw chuck #video #manufacturing
on 02024-04-03dumb criminal, terrible liar #true-crime #video #toread
on 02024-04-03Jeffrey Scullin murder interrogation and confession #true-crime #video #toread #todelete
on 02024-04-03Randy Herman murder interrogation #true-crime #video #toread
on 02024-04-03Joshua Young murder interrogation #true-crime #video #toread
on 02024-04-03Jeff benefited from the interrogation #true-crime #video #toread
on 02024-04-03the witness is actually the murderer #true-crime #video #toread
on 02024-04-03motorcycle-club president Mark: why was I arrested if I’m not under arrest? #true-crime #video
on 02024-04-03carving a landscaping rock into something beautiful #video. He uses a dremel (actually a US$60 Harbor Freight “rotary carver”) and a variety of diamond grinding tools (US$10 or US$15), and clowns around a lot.
on 02024-04-03#alchemy from a 1200-year-old Islamic (Rhazes) manuscript (the Book of Secrets) saved his #ceramics? Mostly a how-to on digging, levigating, drying, and tempering clay to make a workable clay body, although at first he’s leaving out the temper in order to get a handle on shrinkage, then uses a charcoal temper; his clay is very brittle and not very plastic. So he adds water from cooking rice to it, opaque with suspended/dissolved rice starch, to improve its workability. As you’d expect, it also seems to add significant elasticity to the clay, although not as much as I would have feared. Then he mixes in ground rice flour and finely chopped hair (as #Rhazes recommends) and charcoal as tempers. But he doesn’t try actually firing it! Dammit. By #Fraser-Builds. #video
on 02024-04-03#Andy-Ward #bootstrapping #ceramics into #manufacturing a mug #video #toread
on 02024-04-03#manufacturing soap from wood ash and fat #bootstrapping #video #toread
on 02024-04-03#manufacturing a very nice basket from pine needles and thread #bootstrapping #video #toread
on 02024-04-03a US$100 backyard raku gas kiln from ceramic fiber, not counting the cost of the weed-burner torch or the zirconia kiln shelf (discarded by a pottery studio). Interesting note, he sewed the ceramic-fiber roll onto the oil-drum walls with stainless steel wire, but suggests that nichrome would last longer. #ceramics #bootstrapping #video
on 02024-04-03#Fraser builds an 800-year-old blowtorch or "blow lamp" design: a terracotta #ceramics oil lamp, sealed by being cooked in milk and then coated in linseed oil, blown with a copper mouth blowpipe. It works to solder copper wire. He built two separate wicks onto his oil lamp so he can light the larger wick when he wants more power, and eventually used a 3-D printer hotend for the blowing aperture. He recommends T.P. Danger’s 19th-century book “Art of Glassblowing” for lampwork and scientific glassblowing information. And of course one way to make a blowpipe is by glassblowing. #bootstrapping #video #manufacturing
on 02024-04-03using the Kitab Al-Asrar by Al-Razi (Rhazes) #Fraser-Builds fixes his clay for #ceramics. #alchemy #video #toread
on 02024-04-03#Andy-Ward #tutorial on pit-firing greenware #ceramics. He tempers his pots with 20% sand and shoots for 800°–850° for about half an hour, though he maybe was a little short this time. #video
on 02024-04-03#Mikhail-Varshavski on first-aid hacks that should be illegal #video #vapid
on 02024-04-03distilling H₂SO₄. #materials #manufacturing #video recommends taping joints with teflon which can withstand the stuff at its 336° boiling point, using a stirring hotplate to eliminate bumping (boiling chips weren’t enough), using a short-path distillation apparatus, and putting the whole apparatus in a polypropylene bin (which will melt from the heat if there's a spill, but give you a few seconds to get away). He suggests sand or cat litter in the bin would contain it better. He uses differences in refractive index to detect when the new distillate is the same density as the stuff in the receiving vial. #bootstrapping
on 02024-04-03copper chloride synthesis with a spirit lamp. #Fraser just reacts muriate of lime with blue vitriol is all, why do you even need a lamp for that? Oh, he wants the copper chloride for a spirit lamp, so he can make green fire. #materials #video
on 02024-04-03#Mikhail-Varshavski reacts to medical TikTok controversy #video. Basically he wants to get more doctors and nurses on social media to counter misinformation.
on 02024-04-03against microwave kilns #video about #manufacturing #ceramics. The dude has been firing “copper clay”, previously with I guess a blowtorch? And melting parts of a lot of his pieces instead of just sintering them. He thinks the susceptor on the one he bought is carborundum. It’s black, anyway. He’s using an 850W microwave, set for 8 minutes, and some “kiln paper” to prevent sticking. He also puts kiln paper under the kiln to keep it from heating up the glass turntable, which he says was getting “worryingly hot”. The inside of the kiln glows orange. He quenches the copper in water, which seems like it would be a bad idea with ceramics, but he says is required with “metal clay” (presumably copper and silver but not gold). He says the kiln stays hot for 5–6' after opening. But you shouldn’t buy it because it’s inherently dangerous and the manufacturer is anonymous, and speculates it might explode if overfired (it won’t).
on 02024-04-03making simple pendants from scrap glass in a microwave kiln #video #toread
on 02024-04-03how to render and purify tallow #toread #bootstrapping #video
on 02024-04-03#Andy-Ward on three ways to make #ceramics without a kiln: open above-ground wood firing, wood smothered pit firing, and Tony Soares’s method of charcoal firing in a makeshift brick kiln with an inverted steel bucket. #video
on 02024-04-03#Andy-Ward sealing and cooking in unglazed earthenware #ceramics #bootstrapping #toread #video
on 02024-04-03making a #ceramics kiln out of an old oven, but he could only get it to 820°. #video #hoarding #toread
on 02024-04-03recycling thrift-store jewelry by melting it down #hoarding #video #toread
on 02024-04-03#Andy-Ward demolished his primitive #ceramics kiln because he likes firing in an open fire better #video
on 02024-04-03#TKOR firing #ceramics on a barbecue grill #bootstrapping #toread #video
on 02024-04-03#Andy-Ward on wet-processing “wild” clay for #ceramics #video #toread
on 02024-04-03#Andy-Ward on four types of “wild” clay for #ceramics #video #toread
on 02024-04-03#mechanical chainless string-drive #bicycles #video
on 02024-04-03#Andy-Ward warns of dangers of caliche for #ceramics #video #toread
on 02024-04-03DIY vapor-compression #cooling as the first stage in a two-stage cascade cryocooler using 49 grams of propane (R290), initially using a US$80 reciprocating refrigerant compressor off eBay, which he had to add new “ester oil” to. He built his 5.5-meter-long interstage heat exchanger as a coaxial heat exchanger by soldering together copper elbows and other tubing. He recommends silicone caulk rather than teflon taper or plumber’s putty for threaded pressure fittings, but of course most of the connections in the refrigerant circuit are soldered. He immersed the propane-charged apparatus in a bathtub of water to check for leaks, finding one in a pressure gauge. He achieved -32° with his initial reciprocating compressor (ambient temperature a few days later 23.7°), then replaced it with a rotary compressor, which overloaded his homemade condenser coil, so he obtained a better condenser from #hoarding a used air conditioner. This enables him to cool water above freezing at 116 watts (0.83°/minute for 2ℓ), a disappointing CoP of 0.17, probably because he designed his capillary tube for a larger ΔT. #video
on 02024-04-03#Eater Dickson charge pump voltage multiplier #hardware #video
on 02024-04-03debunking an EMP gun #video #toread
on 02024-04-03Tungsten, Periodic Table of Videos #video mentions that phone vibrator motors use tungsten weights!
on 02024-04-03producing #cooling from my pee by reacting with Birkeland–Eyde nitric acid #video #bootstrapping #materials
on 02024-04-03#History-channel acid dangers #video #toread
on 02024-04-03do people use electromagnetic pulses maliciously? #video of almost entirely talking-head and stock-photo filler
on 02024-04-03#ElectroBOOM on electromagnetic pulses #video #toread
on 02024-04-03why doctors hate trampolines #video (basically injuries)
on 02024-04-03#3D-printing flexible living hinges #video Doesn’t credit Snijlab, but then Snijlab deleted their web page on the subject, so they don’t even credit themselves. There’s an interesting sheet-cutting design for a half-dodecahedral bowl using five fasteners (“this little retaining clip”) with split-pin clips on them at 10'10", a connector somewhat similar to a certain construction set I had as a kid. Somewhat perversely they’re using FDM for designs that are basically sheet-cutting designs. Another interesting thing is that apparently current popular slicers (like Bambu Lab’s) support CSG operations, so you can “Add negative part” on the right-click menu and cut holes in things.
on 02024-04-03#CNC-Kitchen Joe Larso’s #PrintABlok #construction-set with square studs on multiple sides of the bricks. The square studs are actually spring snap fasteners! Printed as separate pieces! #video
on 02024-04-03#CNC-Kitchen #video about calibrating #3D-printing devices (especially DIY 3-D printers) for #manufacturing #precision, discussing elephant-foot, corner over-extrusion, over- and under-extrusion, and skew (non-perpendicular X and Y axes). He recommends Vector3D’s £5 CaliFlower calibration STL file, which offers inside and outside measurements in X and Y over 50 and 100 mm, and then diagonal measurements of 100mm. With chamfers on the top and bottom to prevent elephant foot.
on 02024-04-03#3D-printing bores #video #toread
on 02024-04-03driveshafts #mechanical #video by #New-Mind; how driveshafts, universal joints (pot, Cardan, double Cardan, ball-and-trunnion, Tracta, Rzeppa, tripod, Bendix Weiss, and Thompson types), slip-yokes with splined shafts, and differential #mechanisms found their way into automobiles in #history. Lots of low-value filler footage with a somewhat inept voiceover.
on 02024-04-03testing viral #airfryer recipes #video #toread
on 02024-04-03“toxic limestone kilns poisoning workers” in #Pakistan. #video doesn’t seem to justify the #clickbait claims of poisoning (they’re just talking about SO₂ and CO), but it does say the limestone burners suffer damage to vision from the fire, and they get quicklime on their skin (and presumably lungs).
on 02024-04-03see-through suppressor in slow-motion #video #toread
on 02024-04-03#Primitive-Technology #bootstrapping fired-brick hut #materials #video #bushcraft
on 02024-04-03#HTME #bootstrapping Roman concrete #materials #video; he’s using pumice from the Black Rock Desert volcanic field and pumicite (?) from a mine in California for his pozzolan. He clearly doesn’t know how to make concrete; he’s using smooth river rocks and no sand for his aggregate. Although he does use sand in his lime mortar, his cob, and presumably his modern concrete mix! Also somehow his fired clay bricks were only barely stronger in compression than his cob bricks.
on 02024-04-03building a Farnsworth #fusor #video #toread
on 02024-04-03#Nighthawk fireproof expanding graphite #video #toread
on 02024-04-03#Tech-Ingredients DIY thermal paste #video advertising “Glasswire” app for gamers to visualizing their network load and figure out what causes lag. Mentions that Intel processors have the chip in the middle of the package, while AMD processors are spread around the package in multiple chips, so it’s more important to spread your thermal paste well. The result was that, on a Noctua CPU cooler, the Tech Ingredients paste was equivalent to the Noctua NT-H2 thermal paste. Maybe slightly more consistent, but not detectably better or worse.
on 02024-04-03#Tech-Ingredients “nearly free air conditioning” by blackbody radiation into the sky with aluminum tape. Ingenious design for their thermal radiator/heat exchanger/passive low temperature solar collector panel: aluminum channels bonded with epoxy, plus foam blocks to reduce the water volume, and aluminum sheets for the faces. Polyethylene Glad film prevents convective cooling, and he airbrushes a white high-emissivity coating (barium sulfate as specified in a later video, probably nanoparticles of varied sizes with a bit of binder) onto the aluminum. Propylene glycol prevents his water coolant from freezing. He got cooling to -7.6° in an 0.5° environment. #cooling #energy #video
on 02024-04-03#Nighthawk DIY solar thermal panels #bootstrapping #energy #video #toread
on 02024-04-03terrifying nerf pistol #video #toread
on 02024-04-03#bootstrapping foxhole radio #hardware #video sucks, clueless, not worth watching
on 02024-04-03decarbonating bicarbonate into carbonate #materials and then recrystallizing them. #bootstrapping #video
on 02024-04-03extracting sulfur from pyrite #materials #bootstrapping #video #toread. Ugh, now the video’s been taken private! #censorship
on 02024-04-03recrystallizing sulfur #materials bought as agricultural pesticide which are too white to be pure, using toluene as the solvent, bought from a nearby paint store. 97 grams of sulfur dissolved in 350 grams of boiling toluene, yielding 79.6 grams of purified sulfur. #video
on 02024-04-03glacial acetic acid #materials #video. Incomplete, he just purifies sodium acetate and sulfuric acid.
on 02024-04-03how to purify acetone #materials #bootstrapping #video #toread
on 02024-04-03high-entropy metals as alternative alloys to steel #materials #video
on 02024-04-03problems with contaminated acetone #materials #bootstrapping #video. Explains the systematic nomenclature with butanone, dimethylketone, aldehydes, etc. Then he does a fractional distillation to compare Spanish brands. Leroy Merlin acetone, which he describes as “caca de la vaca”, has at least 4% contaminants. Brico Depot had reasonably good quality. Also the paint store next to his house. Misogynist jokes.
on 02024-04-03extracting iodine from povidone iodine #materials #bootstrapping #video #toread
on 02024-04-03piranha solution recipe #materials #video. fairly spectacular demonstration of how it annihilates cotton, sugar, latex, nitrile, old T-shirts, etc.
on 02024-04-03why is sulfuric acid the king? #materials #video
on 02024-04-03self-propelling ionic wind #flying wing #video (well, not quite self-propelling if we require lift; it rotates a mobile containing itself)
on 02024-04-03“things you eat that are a lie” #video about DQ soft-serve (only 5% butterfat), McDonald’s “shakes” (without enough butterfat), etc. Mostly just a bunch of shitty stock footage. #clickbait
on 02024-04-03#manufacturing the world’s largest ridable hexapod, Megahex. Built out of six bargain-basement hydraulic excavators. At least two hydraulic-fluid ruptures in the video. Gradually they got the mean time to failure from one step, to two steps, to six steps... and then gave up. #video #hacksmith
on 02024-04-03Yi Zhi Zhu is making robots from taxidermy; this #video is full of bullshit text though
on 02024-04-03#3D-printing a fractal ball vise. #manufacturing #bootstrapping #video He fills the ball with scrap steel as aggregate in concrete to make it heavier and I guess more massive for hammering. Basically it’s a weighted concrete near-sphere with a PLA skin resting on a rubber O-ring on a concrete base.
on 02024-04-03adding metal parts to #3D-printing plastic with FDM. This seems to be a Stratasys ad. His first example is 3-D printing toothed-belt pulleys for a metal roller-chain sprocket; he pauses the print in the middle to insert the sprockets, which the rest of the plastic captures. Also mentions cartridge bearings, captured hex nuts (cheaper than brass inserts, more resistant to rotation and pullout), and a captured bronze bushing, also inserted during a printing pause. Another technique he shows is inserting 3-D printed parts into a 3-D-printed assembly during a printing pause in order to get the same fully-captured benefit without needing support material for overhangs. Then he demonstrates inserting roller chain and metal-screen filters during printing pauses, and inserting carbon-fiber-reinforced plastic rods during printing pauses to stiffen quadcopter arms. #manufacturing #video
on 02024-04-03#3D-printing and #electroplating #tutorial with graphite. He’s using an LCD SLA printer to get nice smooth prints and graphite spray paint, but shows that some graphite paints are not compatible with some automotive body work putties, because the paint cracks. He’s measuring 12.5kΩ between points a few centimeters apart, which is similar to what I get with a pencil on paper, but after he burnishes it with a towel, he gets only 5kΩ. To burnish his Benchy he tumbles it in walnut shells for four hours. He uses an unspecified commercial bright acid copper electrolyte for the initial plating, using coffee filters for the anode bags on his copper anodes. He recommends using a constant-current power supply with 1A/dm² while rotating the workpiece, but he suggests also using the voltage (0.6–1.0V) to tell if your current setting is right! He gets a lovely mirror finish with his trade-secret electrolyte composition, but then sands and buffs it. Before plating gold, nickel, or silver over the copper, he suggests galvanic degreasing, using a stainless steel anode and 6V; he applies gold with a galvanic brush (electrolyte not disclosed) and 6 volts. #manufacturing #bootstrapping #video #electrolysis
on 02024-04-03#Alpha-Phoenix first-surface mirrors. #optics #video he’s using the silvering process from the Tollens #materials test (silver nitrate, lye, ammonia, and a reducing sugar). Probably this process would be useful for #electroplating non-conductive objects as an alternative to graphite paint. He prints some things in an unspecified plastic with FDM #3D-printing, sands them, applies a two-part epoxy filler (“XTC-3D”) to smooth the surface, and silvers it by spraying precursors from a commercially-bought silvering kit onto it. To keep the resin from dripping off before it cures, he rotates a part slowly on a slanted axis so that it drips back to where it started. This introduced errors far too large for #optics. To try to silver the surface evenly he added a surfactant. In one batch, his epoxy reacted with one or more of the sprayed precursors, getting silver but with a terrible surface finish. In fact, that kept happening afterwards; he found that he had to cure the resin indoors (heat? humidity?) and needed to have the resin component ratio skewed toward component “A”.
on 02024-04-03#Breaking-Taps ultralight metallic microlattices. #video Somewhat disappointing because he didn’t manage to do the self-propagating lightguides thing or the electroless plating thing.
on 02024-04-03#3D-printing a casting pattern, the quick and dirty way, using a Prusa I3 MK3S FDM printer, using a plastic called PVB, brand #Polycast, “designed to burn out very cleanly”. Dude is wearing my slogan. Lots of time-wasting talking-head footage. He also mentions you can smooth the prints with isopropanol, and that he was able to glue it that way too. He brushed plaster on the surface of his print so he wouldn’t have to degas his plaster. He recommends casting in Zamak, which he melts in a soup can, rather than aluminum, and using hardware store ductwork sealed with aluminum HVAC tape to hold the plaster. To my surprise he claims Zamak is cheaper than aluminum, and that most plumbing fixtures and towel racks are Zamak, both of which I think are wrong. #manufacturing #bootstrapping #video
on 02024-04-03#Integza DIY metal #3D-printing by strapping a MIG welder to his FDM printer. He did, surprisingly, get it to work to some extent. #bootstrapping #video
on 02024-04-03DIY metal #3D-printing (SLM of 316 stainless) #bootstrapping with a 155-watt #laser coupled in through a fiber running at up to 300mm/s, getting better results at higher speeds and higher powers. Wow, I had no idea that surface tension gradient with temperature was a thing, but apparently you can reverse it by adding sulfur to stainless, resulting in a reversal of Marangoni convection! Eventually his 3-D printed ASA lens housing overheated and hazed his lens and fiber. #materials #video
on 02024-04-03#Prusa-3D #electroplating after #3D-printing, with some simple instructions but no electrolyte recipes. #video
on 02024-04-03#3D-printing 12 tools: a parallelogram center finder (in which M3 bolts for use as pivots cut their own threads) for boards or square tubing; a square-corner center finder for circles or squares; a center finder for a drill press for centering the drill over round stock with a sort of indicator needle, also with a non-self-tapping screw tapping its own hole; a metric screw measuring gauge with both length and diameter, bas-relief labels colored with a sharpie; a similar fillet gauge; a lockable angle gauge for transferring angles; a lockable contour gauge (like a one-dimensional bed of nails, or a pack of cards, as one commenter suggests), with more self-threading bolts, M4 this time, and a cam lever for locking; a sanding block; tiny “paint cones” for supporting objects being spray-painted on points; the THWACK plastic hammer; a flexure-based tube cutter into which you screw a box-cutter blade, which makes “extremely nice flat cuts” on the ends of silicone tubes; a machine vises with a screw clamping mechanism; a Kant-Twist-style clamp. He also calls out things he didn't print, like a Dremel table-saw/disc-sander/shaper mounting, a hand-held drill guide for guaranteeing perpendicular drill movement, etc. #video #manufacturing #mechanisms #teaching-tech
on 02024-04-03#3D-printing 28 useful tools. #video Toothed glue spreader, screwdriver bit holder, sanding block, collet-style drillbit depth stop, bench dogs for a work table (that fit in its holes), speed square, screw measurer, fillet gauge, stepped keychain hole diameter gauge, Makita battery/charger/tool wallmount holders, corner templates for drawing radiused corners to cut off things (and there are router templates too), C-clamps, pocket hole drilling jigs for carpentry joints, 45° and 60° drill guides, bed scraper to avoid damaging 3-D printer beds, Dremel drillbit sharpening jig, hand trowel, 3D-printer nozzle wrench (using a piece of steel I guess), vacuum cleaner hose adaptors, deburring tools (or more accurately deburring-tool handles), cable soldering jigs, etc. Video begins with a couple of minutes of worthless filler and has annoying music throughout and frequently talking heads.
on 02024-04-03top-10 must-have #3D-printing tools: crème brulée torch (for removing hairspray residue, stringing, stress whitening), isopropanol spray bottle, microfiber cloths, deburring tool, PVA glue stick, an assortment of pliers, a set of files, a silicone lubricant, needles for nozzle cleaning, hex screwdrivers. Mostly talking-head filler; #LoyalMoses is plonked. #video
on 02024-04-03#Clough42 #electroplating with nickel to prevent rust. He’s using 2ℓ vinegar and 1 tbsp salt, strips of nickel he bought off Amazon, using 3A through about 8000mm² of nickel strip to make his nickel acetate bath, without anode bags. He got 26 volts at 3A and 18 volts at 2A so I guess there’s a lot of ohmic losses in his bath, which dropped over time. Eventually he dropped the current to 2A because he was worried about melting his plastic tub. After a couple of hours he got noticeable uneven nickel deposits on the cathode. His nickel deposits on his nickel cathode were not very smooth and easily came off. On copper they did adhere. He made the mistake of trying to use vinyl gloves with acetone to clean his workpieces. In the saturated bath he got 6.3 volts at 3 amps when he was plating his first (steel) workpiece, which dropped to 5.5 volts when he moved the anodes closer. Half an hour gave him a coating that survived motorized buffing. Top comment by the current president of the National Association of Surface Finishing trade association explaining why you shouldn’t do this. #manufacturing #video #plating
on 02024-04-03#3D-printing without layer lines using “fuzz”. He gave up on #manufacturing with a resin 3-D printer because he kept getting warped parts. Lots of timewasting talking-head footage, which is aggravated by the shitty background elevator music (#Jake-Grim). He tried texturing the surface with Blender first, but didn’t know how to use it, so ended up using the “Fuzzy skin” feature in Bambu Studio; with 0.3mm "fuzz distance" and 0.3mm fuzz thickness, the texture is similar to the texture of his heated bed. A commenter suggests using variable layer height. #video
on 02024-04-03#Proper-Printing #3D-printing gel of UV-curable resin, as if with FDM, maybe filled with silica fume to thicken it. He was able to do vase-mode printing but not bridging. #manufacturing #mechanical #video
on 02024-04-03recycling auto parts #hoarding #bootstrapping. Basically just explaining what a junkyard is with stock junkyard footage. Suggests using the junkyard to practice removing parts from vehicles. Worthless #video but at least it’s short?
on 02024-04-03salvaging parts from old computers. #hoarding #bootstrapping #video disassembles DVD drive, rescues motors, etc. He doesn’t like brushless. Does like the ground rods, the magnets in the laser head, some parts of the power supply (heatsinks, power electronics attached to them (mostly diodes but some power transistors), inductors, and large or weird caps, AC sockets, fans), etc.
on 02024-04-03DIY a laser projector from a hard drive to display messages 30 meters away. #hoarding #bootstrapping #video It looks like he mounted 12 mirrors at different angles around the outside of the platters, then used them to deflect a largish green laser diode, but had a lot of trouble with timing jitter anyway, maybe because he's using optointerruptors to directly generate the timing signal and interrupt his Arduino and the optointerruptors have some jitter, or maybe because he’s doing serial port communications at the same time. His first version using a 5mW red laser diode was not as bright as he wanted and only had 8 lines of vertical resolution, so he upped it to 12 and switched to a 120mW 532nm DPSS green laser from eBay. He suffered a lot from PLA creeping under stress, which kept throwing his mirrors out of alignment. Also DPSS turns out to be bad for rapid modulation, so he switched to a 700mW 520nm laser diode, and he added a bleeder resistor to keep the laser from ever turning all the way off so it would be faster. He doesn’t know the AVR video generation tricks that let you use the SPI interface to pump out 8 million pixels a second, so he’s suffering from only being able to do 1 million.
on 02024-04-03cheap pyrolytic stove #hoarding #Cesar #video. He takes two paint cans of different sizes, installing one tightly into a circular hole cut in the bottom of the other with a Dremel, leaving an airspace between the two. The outer can is upside down during operation, so it’s open at the bottom, but since it’s normally sitting on a flat surface, he cuts holes around its base (which would normally be its top) for air ingress. He also drills numerous holes around the bottom of the smaller can, plus a ring of larger ones near its top to let preheated air come into the flame from the sides to ensure a clean burn. He suggests running it on shavings or pellets, or even wax-soaked cardboard cylinders, but not briquettes of shavings or solid wood. His IR sensor says the inner can reaches about 500°.
on 02024-04-03#Madman salvaging a washing machine motor for a belt sander, using mostly a MIG welder, a vise, a hand file, a drill (without a drill press, but with a redoubtable selection of holesaws), a hydraulic press, and an angle grinder. As an anvil he has a section of railroad track. It took him a month and a half. #bootstrapping #hoarding #video
on 02024-04-03#EEVblog salvaging parts from #inkjet printers (HP Officejet Pro 8710) to reuse; specifically the power supply (32V at 1095mA or, in sleep mode, 12V at 170mA), four conveniently mounted infrared photosensors, ferrite beads, coin cells, through-hole inductors, a relay, high-voltage suppression caps, a surface-mount pulse transformer for power supply feedback, an LCD screen with flat-flex cable and IR LEDs around it for the IR touchscreen, linear scanning array (CCD?), dc motor with relative optical encoder, linear rod for the carriage, lots of T10 Torx screws, four more dc motors (the head drive motor being a large 20-watt Mabuchi RS-645VA-24135, the third being in the ink sump pump, and the fourth being the paper advance motor with a 600-count optical encoder disc), optical encoder grating tape, speaker, springs. Says there’s nothing of value in the paper tray and that the plastic is nonreusable, so in summary it’s “not worth your time”. #hoarding #bootstrapping #video
on 02024-04-03#TPAI salvaging parts from printers and scanners to reuse. #hoarding #bootstrapping #video very slow paced. From an HP inkjet/scanner combo he salvages a paper cone speaker, a switchmode power supply, the paper feed photointerruptor optical encoder (with a bit of abuse to the transparent plastic disc), the paper feed dc motor, the carriage dc motor (including its wiring harness), the precision ground carriage rails, the carriage drive toothed belt, the photointerruptor tape from the carriage encoder, numerous springs, the sump pump dc motor with its photointerruptor encoder, lots of plastic gears, the paper feed platen axle and another paper feed roller axle, the scanner bed glass, the scanner drive stepper motor, the CCFL power supply, the cold-cathode fluorescent lamp itself, three mirror-glass strips, and the scanner lens. It looks like he was going to make a followup video but never did (this was ten years ago).
on 02024-04-03#TPAI salvaging parts from dishwashers to reuse. The interior is stainless! And he salvages thermal cutouts, water heating elements, a 16-amp 240-volt relay, a capacitor, the power switch, a pressure switch, a shaded-pole induction fan, a 30-watt “extrusion pump” to move water, some smaller relays, a bunch of power electronics (including seven triacs), a rotary switch, an EEPROM, some opamps, some darlington array drivers, a thermistor encapsulated in stainless steel, an electromechanical valve (“Aquastop”), a styrofoam float microswitch, the giant induction-motor-driven dishwasher circulating pump (the single-phase type with a start capacitor), and a Mitsubishi M38027M8 8-bit microcontroller. #hoarding #bootstrapping #video #scouting
on 02024-04-03#StuffMadeHere fixing a little mess with a big mess #video #toread
on 02024-04-03coppiced willow for living fences, weaving baskets, feeding goats, etc. #bootstrapping #video
on 02024-04-03bringing home cooking gas in big polyethylene bags in Pakistan #video apparently it’s propane though because it’s not floating up into the air and it’s not coming out of the tank (?) as a mist. Often they have a several-meter-long rope to the other end of the bag to hold it up vertically. At home they hang the bag outside with a transparent hose running inside, using a small electric water pump to suck it out of the bag. A brass valve is taped into one end of the bag to hose-clamp the hose to. The very long flames coming out of the burner also look like propane. Later they demonstrate a Kia car (license plate obscured!) up on a scissors jack using a temporarily removed passenger-side front wheel as a power takeoff to grind wheat into flour, driving the flour mill via a couple of U-joints. Not sure if this is related other than also happening in Pakistan. Then there’s a third apparently unrelated video about sawing wet concrete (?) into large blocks by hand, then carving them to the desired shape with an axe and a series of other steel implements, possibly not even in Pakistan. Ingenious #manufacturing technique but apparently nothing to do with the first two. Then there’s a segment about making mochi in Japan.
on 02024-04-03making #music on a saw that can cut you in half. #video of a guy first learning to play the musical saw, taught by Natalia Paruz (sawlady.com) who explains the basic techniques, with both bow and mallet. Includes some lovely improvisation, then a bit of Nothing Else Matters, then some Chladni figures with talcum powder.
on 02024-04-03Pawn Stars Aztec #death-whistle #video appraised at US$5000
on 02024-04-03#jimmydiresta on #manufacturing with the bandsaw (9 beginner mistakes) #video: using the blade that came with the machine or using a stamped blade, with the consequence that it begins “drifting” (he likes 14tpi Timber Wolf blades from Suffolk machinery for wood, MDF, brass, and aluminum); trying to cut into a round object or a natural shape like a tree branch on the bandsaw, without fixturing them down first with for example a screw clamp flat against the table; “high-siding”, cutting things that are not well supported on the table (you can support them by sticking another piece of wood through the blade below them); using the shitty plastic table support that comes with the saw; cutting relief cuts for a curve cut to prevent making concave pieces of wood; not cutting relief cuts (tangent to the curve) when making a curve cut with a wide blade; flicking away small pieces of waste with your fingers or not at all, rather than with a fat pencil with a rubber eraser; pulling the blade off the bandsaw trying to get out of a deep curved cut (“just turn it off”, he advises). He also recommends rotating material 180° after a test cut to see if your table is square to the blade. This guy is fucking incredible on the bandsaw.
on 02024-04-036 #materials processes that “changed the world”: #video of apparently 100% talking-head and stock footage garbage by "Breaking Vlad"
on 02024-04-03the world’s 8 most produced #materials by #BreakingVlad: H₃PO₄ (83 million tonnes per year), Cl₂ (97 million tonnes per year), NaOH (100 million tonnes per year), N₂ (120 million tonnes per year), C₃H₆ (150 million tonnes per year), NH₃ (176 million tonnes per year), C₂H₄ (223 million tonnes per year), and H₂SO₄ (233 million tonnes per year). Shitty talking-head #video repeating bullshit with stock footage.
on 02024-04-03#manufacturing acetone #materials from eggs by eating the shell with vinegar to make INS 263 and then dry-distilling it. He says he got 20% yield. He started by cooking the shells to burn up the organics, but not really enough, so he only succeeded in charring them, which he regrets and doesn’t recommend; it made the whole process smell unbelievably terrible until he removed the waste products. After weeks of digestion in vinegar, he added activated charcoal from a water filter in the middle, decanted it, strained it through a screen, filtered it through a cotton ball, and got a brownish transparent solution. After a second decantation step he let it dry for a few more weeks to crystallize acetate crystals in bizarre hollow cauliflower shapes. I think he probably could have purified it a bit at this stage by only doing a partial crystallization, but he let it dry completely. Then it rehydrated from the air and became soft, no longer stinking of burnt corpse. He says it requires about 400° to decompose, not 160° as Wikipedia says, so he had to switch from his hotplate to a heating mantle he made from plaster and a hair dryer heating element, which burned out immediately, so he made another one. The distillation then produced a flammable orange liquid, probably mostly acetone. Naturally his shitty plaster heating mantle started crumbling. Perhaps he wasn’t cooling his distillation enough, because he lost a lot of white vapor, though he says it was side products. Because the heating mantle reached red heat, his borosilicate round-bottom flask melted somewhat, cracked from the temperature gradient, and melted some holes in the bottom. As a replacement distillation vessel, he drilled an empty butane cylinder (underwater to keep the drillbit cool and prevent air from contacting any potential sparks), filled it with water to drive out the butane, then drilled bigger holes and used it as his dry distillation flask. To purify the orange acetone, he started with fractional distillation, getting a light yellow acetone. Cleaning the distillation flask was very difficult, requiring not just a base bath but sanding. For a second fractional distillation of the yellow stuff he used a hotplate oil bath and 500mm of distillation column, wrapped in aluminum foil, obtaining almost colorless acetone. A third fractional distillation removed the remaining color, but it still smelled burnt. So naturally he refluxed the acetone with a giant quantity of KMnO₄ for 15–20 hours, then did another fractional distillation to get the acetone back out, at long last eliminating the burnt stench. Then he tried another purification with aqueous silver nitrate and sodium hydroxide as recommended in Vogel’s “Text-Book of Practical Organic Chemistry”, third edition, leaving a black gunk in his flask which had to be cleaned with nitric acid. Another fractional distillation removed most of the water, and finally calcium sulfate hemihydrate removed the remaining water, though not before he broke his hotplate and his camping stove trying to dry the sulfate. An additional distillation separates the dry acetone from the plaster. Then to try to get the yield above 20% he tried re-purifying some of the fractions discarded during the various distillations with the silver-oxide method mentioned earlier, followed by KMnO₄, at which point he regretted adding so much at once, because the acetone started boiling from the reaction before he could dunk the erlenmeyer in a water bath, at which point he gave up. #bootstrapping #video
on 02024-04-03#AvE on #manufacturing tools for engines, etc. He’s trying to recycle aluminum (and having trouble with oxide), fixing a minor crash on his Haas CNC mill which bent the sheet metal covering one side of the Z-axis accordion (no replacement part listed), and cremating a dead mouse. After pounding the bent part into shape on his vise with a hammer, he welds it back into the cover. Aluminum HVAC tape covers a multitude of welding sins. Aluminum chunks on top of the aluminum turnings enabled all the aluminum to melt together rather than remaining separated by their oxides. #video
on 02024-04-03#Nighthawk solar-powered noodles in #flight (#flying?) Mentions Bovine Aerospace’s painter’s-plastic balloon (plástico para pintores, 8μm), which he throws a handful of fine charcoal powder into to get sunlight absorption. Due to not having a giant sealing machine he lays a board across some sawhorses, masking-tapes the plastic to it, and tried sealing it with a clothes iron! Which didn’t work, so he used adhesives, specifically doublestick tape from a craft dispenser. He suggests soot from a fatwood fire might be a better alternative to the charcoal powder. He incorrectly states that water vapor is heavier than air. #video
on 02024-04-03#Nighthawk #thermoacoustics introduction. Cringe-inducing scientific errors as usual; first forehead slap is at about 2:40 into the 18-minute #video. More cringe-inducing errors at 3:55. And, as usual, he doesn’t measure any results such as frequency, amplitude, voltage, or current. Still, he deserves a lot of credit for providing an easy-to-follow tutorial for building a basic thermoacoustic Stirling engine.
on 02024-04-03#HTME #bootstrapping H₂SO₄. There’s a natural source in Yellowstone which he didn’t use; instead he used sulfur collected from an old sulfur mine in Death Valley which exploded in 01953. He planted red cabbage in raised beds earlier to make anthocyanin as an indicator (but also used commercially made four-dye pH test strips). He tried dry distillation of blue vitriol and green vitriol to get H₂SO₃ (pH 5–6) and then waits (the dry distillation took weeks). For the dry distillation he cheated by making a still out of steel pipe, because this was shortly after the workshop fire. Then he boiled it down to get a pH of 2. But even at a pH of 0.5, industrially produced H₂SO₄ doesn’t dissolve chicken wings, though it does at pH -1.27. Heating pyrite in water to oxidize it reached a pH of 3 after several years. #materials #video
on 02024-04-03#HTME on #bootstrapping batteries and generators, with reference to Dr. Stone. He doesn’t know about current or that the homopolar generator he built can supply a massive current. #video
on 02024-04-03#HTME on #bootstrapping #hardware. #video
on 02024-04-03#Clickspring on #manufacturing carbon steel hairsprings for #mechanical watches #video
on 02024-04-03solid-state dehumidifier for #3D-printing #video. It uses electrolysis to pump hydrogen through an ion-selective membrane out of your dry box.
on 02024-04-03conical slicing for FDM #3D-printing without support material #video
on 02024-04-03#manufacturing DDNP poof-powder #materials (01969 Army field manual procedure) #video
on 02024-04-03#manufacturing ethane (R170) #materials for refrigerant (for the second stage of a cascade). His R600a tabletop icemaker compressor was able to condense CO₂ and N₂O despite only reaching 10 bar, but only barely handled ethylene, which he had made by running ethanol through Al₂O₃ at 450°. So he’s making ethane by Kolbe #electrolysis of sodium acetate on a platinum anode, liberating CO₂, which he has to remove with a Ca(OH)₂ scrubber. To avoid producing lye and thus oxygen, he includes an excess of acetate, in the form of vinegar; he got a weird oil making the sodium acetate. He uses ABS putty dissolved in acetone to seal his electrolysis electrode junctions inside an ABS sleeve he 3-D printed. He switched to using a float switch because his conductivity probe made of two stainless-steel screws was failing, maybe because of the oil. Includes Faraday calculations from first principles. Demonstrates burning soap bubbles of C₂H₆/CO₂ squeezed out of a syringe. He didn’t use enough vinegar, so his pH rose to 9.6, meaning that this process is an effective way to make alkali (probably Na₂CO₃, as evidenced by CO₂ bubbles when he adds more vinegar), since the anion turns into gas. With the pH at 5.6 he got 1.08ℓ/hour of gas from 700mA, close to the theoretical 0.94. His scrubber and gas drier are two packed-bed jam jars with pipes and hoses glued onto their lids and bases, sitting on 3-D-printed supports. By spraying liquid ethane all over the place after precooling it to -12° with his first refrigeration stage, he gets to -90°. He thinks a PbO₂ anode would work too. #video #Hyperspace-Pirate
on 02024-04-03#Steve-Mould on the “portal illusion” with helices #video
on 02024-04-03#Xyla-Foxlin #manufacturing an Adirondack chair with solar power #video advertising Anker’s 6kW “portable” rollaround battery, which lets her charge up to run high-power tools like her Tormach CNC mill over a long period of time. And actually it turns out her house doesn’t have enough power for the CNC router. She’s CNC-routing all the chair parts out of emerald birch plywood, a pure sheet-cutting design, but then runs all the pieces over her router table with a roundover bit to round the corners. The chairs look amazing.
on 02024-04-03150kV stun-gun #hardware (but with some components blurred out? This “Nicolas Salenc” is carefully blurring out his resistor color codes and his transistor part numbers for some reason) Lots of sloppy schematics of different circuits. #video #pseudoscience
on 02024-04-03#Andy-Ward on #bootstrapping clay for #ceramics from dirt, part 2. Recommends looking for “crackle texture” on the surface to locate dirt with a high clay content, then feeling for hard lumps. Later screen the clay to remove large particles, then paint strainer bags for removing silt, and levigation if that’s insufficient. #scouting #video
on 02024-04-03#manufacturing #ceramics in a 01978 Amana RadaRange microwave oven he got for US$15 #video (kind of stupid, this guy Erik Gellert has no idea how to make this actually work, and just ends up drying out his plastic clay and getting some steam explosions)
on 02024-04-03sterilizing your hands with ozone from a 200kV corona discharge portable Kirlian photography setup (not explained) #video
on 02024-04-03#manufacturing a #cold-plasma torch for bio lab sterilization. You stick a needle or a thin nichrome wire in a quartz capillary tube and, some distance down the tube, a metal washer (or piece of brass tubing with no sharp edges) around it. Then you power them with a ZVS driver and flyback transformer, and blow argon through the RF spark between them. After 17 attempts over a year, he finally built a practical version. A delrin spacer kept the high-voltage electrode from directly touching his outer acrylic tube; a similar teflon spacer kept the “washer” from touching the acrylic. This was because the acrylic was becoming charged and attracting the plasma, keeping it from escaping the torch. He plans to publish a paper on how to do it. #Thought-Emporium #video
on 02024-04-03#Backyard-Scientist gallium versus a high-pressure compressed gas bottle: gallium wins #materials #video
on 02024-04-03#manufacturing #ceramics by pit-firing in your back yard #video full of bullshit about pores in pottery opening with heat and closing when cooling, confusing grog with tempers in general, how “mineral vapors” produce different colors, etc., plus lots of useless footage of some guy talking to the camera #pseudoscience #misinformation
on 02024-04-03#Andy-Ward on #manufacturing #ceramics from store-bought materials in the city. Some talking-head filler. But mostly he buys clay at Hobby Lobby and makes pottery from it with pottery tools from Michaels (another craft store) and fires it in his yard. It’s probably a ball clay body, Hobby Lobby Moist Pottery Clay X-15. He tempers the clay with a bunch of sand from a nearby dry wash riddled through a screen from his house window. He coils the pot in a thrift-store bowl, protected with a wet handkerchief; the bowl allows him to rotate it. Before firing he stone-burnishes it with petrified wood. To protect his driveway from burn marks, he dumps another bucket of sand on it. He preheats the pot in the kitchen oven to dry it, then uses three bricks on the sand to make a sort of three-stone stove to hold up the greenware pot, then fills up the rest of the fire pit with charcoal briquets. He builds the fire pit three bricks tall, without mortar, puts an upside-down metal bucket (US$19) over the pot to prevent the charcoal above it from damaging it, and covers the top of the charcoal with a barbecue grill supporting large pot shards to keep the heat in. His thermocouple registers 700°, and the pot did sinter properly despite the clay being labeled for cone 5 (about 1100°). In total he spent US$97. He calls the three-brick technique “urban Anasazi”, crediting Tony Soares. #video
on 02024-04-03#manufacturing a carved chain out of a fossil rock #video. He starts by squaring up the rock into a square prism with wet cutting on a diamond table saw. Then he built a jig above the rock saw to allow him to cut it into a 36mm-across plus-sign-shaped prism, with 12mm-thick strokes in the +, with the top 12mm edge of the diamond blade. Then he marked chain link outlines along sides of the arms of the + with a cardboard template and a white paint marker. More table-sawing roughs out the links. A dremel flex shaft with a cutoff wheel allows him to slit the insides of the links. A diamond core drill in a drill press cuts the center of the first and last links out, underwater in tupperware. More table-sawing removes some more waste stone. Links in the middle are separated with a smaller diamond core drill underwater in the drill press, drilling in from both sides to meet in the middle; then a tiny 1mm drillbit in the Dremel, drilling underwater, removes some more thin slices, but several such drillbits broke. Finally a better one worked, but he was dipping it in water rather than drilling underwater. Drilling in with the tiny drill at an angle from all sides allowed the chain links to separate. A Kingsley North diamond drum grinder, similar to a common bench grinder, permitted freehand rounding of the still fairly square chain links; a Dremel diamond drum worked similarly to fillet and round the inside surfaces. For surface finish he wet-sanded it by hand with 220-grit sandpaper, followed by something else with a name like “Zam” or “Zeum”. A beautiful, shining black oil-shale chain full of fossils.
on 02024-04-03#Mikhail-Varshavski “reaction” video to “Osmosis Jones” #video about I guess a kid’s movie?
on 02024-04-03#manufacturing stone spheres cheaply #video on using diamond hole saws to grind down a rock with an electric drill while it’s mounted on an unpowered spindle (via a superglued dowel in a hole made with a smaller hole saw), allowing you to slowly rotate it around a second axis as you spherify it with the large hole saw under a faucet during an hour and a half. Then the dude sands it down in his hand, also under the faucet, with a velcro cup sanding attachment for his drill and a series of carborundum grits for a couple minutes ach: 400, 600, 800, 1000, 5000, 10000. Pretty beautiful. Still seems like a lot of manual work for something that looks easy to automate.
on 02024-04-03#Mikhail-Varshavski reacting to “Bear Grylls” questionable tips. #video
on 02024-04-03#Mikhail-Varshavski correcting mistakes in his medical videos. #video
on 02024-04-03#manufacturing nose-picking brass automata with pewter-casting in silicone, among other things #video
on 02024-04-03making a wax seal #video by #Uri-Tuchman. Lots of #manufacturing brass and wood parts on a lathe, pantograph, handsaw, bandsaw, router table, hand file, etc. He tried making a form for the pantograph with an Elegoo LCD SLA printer, modeling it in Blender, but gave up. #3D-printing
on 02024-04-03incorporating metal turnings into fired-clay #ceramics makes blurry red and black spots in the glaze; further reduction firing in gas produced blotches of iron and copper on the surface. Later he has to Dremel the bases a bit because his glaze stuck to the “wadding” feet he had stuck on there. #materials #video
on 02024-04-03“incredibly cool” "freevalve" #Koenigsegg #internal-combustion #mechanical design; uses solenoids and position-sensor feedback to control pneumatically-actuated poppet valves, but has taken many years to come to market. #video
on 02024-04-03did Cilantro always taste like soap? #video
on 02024-04-03rotary #internal-combustion #mechanical engine valves rather than poppet type. It’s a very nice idea, but it doesn’t seal as well, so it’s not used much, though there is a racecar in New Zealand by Ralph Watson called the BSA Racer or BSA Special. Vaztec in the USA is trying to commercialize a rotary-valve design. #video #mechanisms
on 02024-04-03thermite #materials powered hotdog heater by #Thought-Emporium #video #liststart
on 02024-04-03the Udacity #video that explains #particle-filters with pseudocode and a one-dimensional simulated robot
on 02023-10-01another Udacity introductory #video on #particle-filters, with a guy whose accent sounds like Sebastian Thrun’s, with a table of filter types and the video of the robot wandering around a simulated office building
on 02023-10-01Udacity introductory #video on #particle-filters: “Particle Filters Basic Idea”
on 02023-10-01a prototype #video #codec implementation for videoconferencing
on 02023-08-09#Video of ken thompson interviewed by Brian Kernighan at VCF East. Lists the users of PDP-7 Unix (himself, Dennis Ritchie, [Doug] McIlroy, and [Robert] Morris) and mentions that TMG went proprietary because Robert McClure wanted to take it with him when he left Bell Labs. #history
on 02023-07-06#video of a talk by #Facebook people about how they built Fecebutt Messenger with #Erlang
on 02023-07-04Stonebraker’s 02013 talk about how everything you know about #databases is wrong (because it's obsolete); instead he argues that star-schema data warehouses should use #column-stores like MonetDB and Vertica (because they’re 50–100× faster when you have 50–100 columns but only look at 4–5 attributes and always do SQL aggregates), while for OLTP databases “NewSQL” systems are “wildly faster”, about 100×. Explains column stores using Vertica as an example, explaining that segments of rows get buffered in main memory and then written out as “slabs” of compressed column “chunklets” which are later merged into larger segments (LSM-tree style, I suppose). Explains that #OLTP databases are almost never over a terabyte, which was US$30k of RAM at the time (64 gigs in each of 16 servers). “Data warehouses are measured in petabytes, but not OLTP,” but conventional databases waste a lot of time encoding and decoding it, maintaining LRU lists, doing record-level dynamic locking, latching B-tree pages, latching the lock table, and logging transaction recovery records. So H-Store and VoltDB statically partition main memory among cores and run one thread on each core to eliminate latching and locking. This makes it seem like maybe software transactional memory might be an interesting way to implement an in-memory OLTP database. Unsurprisingly #Stonebraker is very much not a fan of #eventual-consistency. He argues that replication via log shipping will inevitably result in a 3–6× slowdown over the optimal case because it commits you to writing a write-ahead log so you can ship it, so it's better to just duplicate the computation of the transaction on each replica, and similarly use "command logging" for durability. He says this requires you to use timestamp ordering (or some other deterministic scheme) rather than MVCC. #Video is loaded from YouTube misleadingly: it's 1h12m33s, not 12m33s. I guess Stonebraker must really hate Postgres for some reason because he never mentioned it once, while mentioning almost every other SQL database!
on 02023-07-02#video from 01987 about the #Acorn #Archimedes and the origin of the #ARM, including an #interview with Sophie Wilson featuring the term “order codes”, and some machine specs for the 305, 310, 410, and 440. It comes with optional built-in “Econet”, which turns out to be 800kbps RS-422. Features footage of PCB rework, pick-and-place machines, and “flow soldering”, which I think is not quite wave soldering. Inspiring examples of what you can do with 4 MIPS, 1 MiB RAM, and I guess a TrueColor display, including real-time 3-D with hundreds of flat-shaded polygons. #manufacturing #history #retrocomputing
on 02023-07-02discussion of #MP3 and #MP4 and #video #codec stuff
on 02022-12-28"AngelPotion" was a #video #codec that was a slight hack of #DivX
on 02022-12-28#video of Gravity jetpack #flight test for paramedics
on 02022-01-11#video of paragliding #flight to McDonald’s
on 02022-01-11powered paragliding #flight #video
on 02022-01-11Stephen Hawes’s The Index Pick and Place Can Build Itself, #self-replicating #hardware using “Open Pick and Place” (?) and doublestick tape #video
on 02021-12-08#video of an ARM engineer who does like #RISC-V in 02019, says it’s state of the art
on 02021-02-09#video of "SDFDiff" #Differentiable #Rendering of #Signed-Distance-Fields for #3D Shape #Optimization (CVPR2020 Oral), using a multiresolution strategy. #graphics
on 02021-02-09#Video of the #DIST #differentiable #graphics #rendering software #3D scanning a couple of chairs with #optimization
on 02021-02-09#video of #QiskitBlocks #game where you escape from escape rooms by designing quantum computing circuits #QC
on 02021-02-09#video #toread of CNC-making a cigarette lighter from an old Soviet camera
on 02021-01-20#Video on “glasshouse vegetable production in the #Netherlands” #greenhouse #agriculture #vertical-farming
on 02021-01-20#video on Sandland, where they dig underground tunnels through sandstone in #Wisconsin. #bootstrapping #mining
on 02021-01-18#video: boy solves three Rubik's cubes in just over five minutes while juggling them; Guinness Record
on 02020-09-27#Video of #OpenAI using #neural-networks to autogenerate Python code.
on 02020-06-17postmortem #video about industrial accident investigations
on 02019-02-25#video of #Portland #USA police allied with white-supremacist groups Patriot Prayer and Proud Boys
on 02019-02-19#throatsinging #music #video by The HU
on 02019-02-01Criadero, a #video about a family raising and slaughtering a pig
on 02018-11-12#video on simplified #electroplating (copper, nickel, or zinc) with vinegar and salt. Comes strongly recommended. #materials
on 02018-11-04"Slaughterbots" #video on #drones. Shortened URL <https://is.gd/slaughterbots>.
on 02018-10-19#video about how music videos are made
on 02018-10-18#video of the #Clarendon-Dry-Pile, whose battery appears to be about 30mm in diameter.
on 02018-09-24#video of a Zamboni-pile-driven torsion pendulum.
on 02018-09-24#Bret-Victor "Stop Drawing Dead Fish" #video is nearly an hour; it demonstrates some novel #UX techniques, including some quasimodal #multitouch stuff using multiple tablets, at 4’53”–5’12”, 6’41”–7’50”, 8’42”–8’58”, 9’35”–9’56”, 10’40”–12’15”, 12’48”–14’56”, 16’14”–18’13”, 19’30”–20’52” (multitouch puppeteering); 25’51”–33’53”, 36’00”–39’20”, 41’21”–45’47” (geometric programming by demonstration of puppeteerable animations); 50'03"–53'20" (improvisational multitouch multimedia puppeteering).
on 02017-12-31#Bret-Victor #multitouch #UX excerpt from the “Inventing on Principle” #video showing his animation program prototype, using quasimodes and “performing with my hands”. The whole talk is about an hour; this is 2'13" of one particular impressive demo. (Taken private within the next year, so the link is broken.)
on 02017-12-31"FingerGlass" 2011 #multitouch #UX #video by Käser, Agrawala, and Pauly. FingerGlass uses two fingers to define a focus area that pops up magnified, permitting a third finger to do precise manipulation within the zoomed-in region.
on 02017-12-31#Michael-McGuffin #multitouch #UX #video using pop-up pie or radial menus: “First step, I put my finger down on the object I want to manipulate. Second step, I select the command [from the pie menu]. Third step, my two fingers provide the [continuous] arguments to control that command. I can do all that with a single hand, just by positioning my fingers appropriately to grab the command in the menu.” Presented at AVI 2016. The rather ponderous name is “Multitouch radial menu integrating command selection.”
on 02017-12-31#Daniel-Vogel #video of evaluation of #multitouch #UX for mode-switching, comparing chording, long-pressing, a quasimode button for the nondominant hand, hard-pressing, a thumb-on-finger sensor, and a knuckle sensor, all on a large tablet.
on 02017-12-31#Daniel-Vogel #multitouch "Pinch-to-Zoom-Plus" #UX #video improving pinch-to-zoom
on 02017-12-31#Daniel-Vogel #multitouch "Pin-and-Cross" #UX #video for rapid contextual commands with two simultaneous touches from the same hand
on 02017-12-31#Haijun-Xia #multitouch "Object-Oriented Drawing" #video on #UX for alternatives to WIMP form-filling for handling (in this case graphical) objects with many (continuous) attributes
on 02017-12-31#Haijun-Xia #multitouch "Collection Objects" #video on #UX for working flexibly with collections of (in this case graphical) objects
on 02017-12-31#video of 2016 installation of #Chernobyl “New Safe Confinement” installation, a sort of giant Quonset hut slid into place over the plant.
on 02017-11-25#video on why to study #music theory on a music-theory channel
on 02017-08-22#video on fictional computer #UX (“#FUI”, fictional user interfaces) by the dude who wrote the “Make It So” book
on 02017-08-22#video series for learning Mandarin #Chinese
on 02017-07-08#video on the #Laplace-transform
on 02017-07-01#video of Robin Hanson debating Mencius #Moldbug, posted by Monica Anderson
on 02017-07-01Jeri Ellsworth #video on #magnetic-logic #hardware with some oscilloscope demos. Cites 1961 book “Square-loop ferrite circuitry”, by C. J. Quarterly (? Maybe Quartly 1962?), which I can’t find.
on 02017-05-30#video of a #demoscene production on #AVR #microcontroller #hardware generating color VGA signals on three ATTiny85 chips run off a common clock, driven from a 9600 baud serial signal, "OctaPentaVeega" cc-by-sa
on 02017-05-29flamethrower #drones #video #China #weaponry
on 02017-05-28annotated #video segments from the #USA attack on Kurdish protestors by #Turkey during #Erdoǧan’s visit. #human-rights #politics
on 02017-05-26#video of the RICM #PDP-8 processing a paper tape
on 02017-04-30highly recommended #video series on linear algebra by 3Blue1Brown
on 02017-04-30#video of testing selenium rectifiers and copper oxide rectifiers, including I-V curves. #hardware #history
on 02017-04-16#video where Dave Jones tests PAL 63.8μs ultrasonic delay line #hardware and gets a fairly flat response from 2MHz up to 20MHz, almost no secondary reflections, and about 20dB attenuation from input to output
on 02017-04-13this #video on buck converter #hardware is really excellent, starting with Arduino PWM
on 02017-04-02#video explaining #hardware phase-locked loops with Bil Herd and #Jeri-Ellsworth
on 02017-03-31at 23 minutes into this #video, we see the #Contiki web browser displaying amiga.org on a #Commodore-64. #6502
on 02017-03-22Sergey Baldenkov #video of #machining stone with extremely primitive vibrating bits (chunks of pipe tied to rocks, bent copper sheets, wires, other rocks) and wet abrasive, driven by a loudspeaker driving a metal diaphragm. Most of the sonic energy sounds like it’s in the 100Hz–1kHz band — the method would likely be faster and way less annoying if it were at a higher frequency, though getting vibrations big enough to use coarse abrasive would require higher power densities. Associated with all kinds of free-energy #pseudoscience nonsense (“technology of the ancients”, John Keely, Ed Leedskalnin’s Coral Castle, UFOs, etc.)
on 02017-03-22#video by clkindred of a homemade coffee can forge with about 10cm of homemade castable refractory (perlite, plaster of paris, and sodium silicate #materials) and a homemade stainless steel gas-fueled (propane?) burner modeled after the one in his camp stove. The gas orifice is an 0.016" hole drilled in a ⅛" NPT plug coupled to a ⅛" hose barb with a standard pipe coupler. The stainless-steel burner tube is from an apple corer. He seems to be getting to 1100°, guessing from the incandescence color. He seals the surface of the perlite with a cement of sodium silicate, talc, and corundum abrasive, with a slight amount of plaster of paris as an accelerant, to have a kind of hot face. (I’m sort of surprised the perlite isn’t melting.)
on 02017-03-22a multi-terabyte torrent of the UC #Berkeley #video lectures that UCB pulled off YouTube.
on 02017-03-22#video of the presentation of Digimind’s 256-byte intro “Immediate Railways” at Function 2015 with the audience reaction. An interesting 3-D rendered animation in MS-DOS in 256 bytes: mindboggling. #demoscene #smallisbeautiful
on 02017-03-22Jove is a web site with #video instruction in all kinds of things; this video covers plating methods for bacterial cultures on agar.
on 02017-03-15#video of #3D-printing houses from adobe with the Big Delta WASP
on 02017-03-10the best #video to demonstrate #powder-bed #3D-printing, of the “Plan B” open-source printer.
on 02017-03-09#video of Aaron Hsu talking about #compilers for two hours. #Co-dfns #GPGPU #APL
on 02017-03-07#video demos of CalculiX, a free #FEA app
on 02017-01-16#video of ForcePad, a GPL free #FEA and #topology-optimization app with real-time feedback on a 2-D design; I think it uses CalculiX. Abandoned since 2008
on 02017-01-16#video of the non-free #topology-optimization app published by DTU with real-time feedback on a 2-D design
on 02017-01-16Cody Reeder (“Cody’sLab”) successfully mining a gram or so of #aluminum from aluminum silicate clay: he pulverizes by beating on a plastic bag, allows a water slurry to settle to separate out the clay, adds hydrochloric acid to solubilize the aluminum as aluminum chloride, allows the silicates to settle, neutralizes the liquor from the top using sodium hydroxide drain cleaner to get insoluble aluminum hydroxide, washes it to remove iron hydroxides, calcines it at 1000° to get alumina, dissolves it in a graphite crucible in store-bought cryolite, electrolyzes the solution with a plug-in 200-amp car starter connected to a preheated carbon electrode, and then breaks up the hardened poured mass to find native aluminum particles, in the Utah snow. #materials #materials #video
on 02016-12-23National Geographic documentary #video about Adani’s new #solar #photovoltaic #energy plant that was built in 8 months in #India. Seems like they graded the site but didn’t concrete it, and use a dry robotic brushing system to clean the panels.
on 02016-12-21#mechanical #video playlist showing lots of renders, including many of thang010146’s.
on 02016-12-21#video of how to repair a #mechanical #cycloidal drive, unfortunately with horrible elevator music
on 02016-12-21#video of M. Oskar van Deventer’s “Extreme Reduction” gear #mechanical #hardware, which gears the input motion down by about 11.3 million to 1 by way of a differential between two sets of what he calls “grinder gears”, which are themselves differential #cycloidal drives made of about three moving parts. The mechanism is quite compact. Later he made a billion-to-one version.
on 02016-12-21#video of the #Maslow #CNC #2d-cutting router for 4×8 plywood, basically a #hanging-plotter using #25 roller chain on a 200:1-reduced DC motor with a relatively coarse shaft encoder on the motor side of the gearbox, with a couple of bricks weighting down the router. 8148 steps/rev encoder, ± 1/64th inch (.4 mm) or better, 48 inches/minute. Not all open source, but all at least cc-by-nc-sa. By BarSmith, aka BarbourSmith. US$350, not including the router or bricks.
on 02016-10-14#video of #weaponry dropped from (teleoperated?) #drones in #Syria
on 02016-10-11#CodysLab #video where he oxidizes aluminum with lye with a teakettle and fishtank to separate hydrogen and distills it out. #materials #bootstrapping
on 02016-10-10#CodysLab #video with beekeeping, chokecherries, and flame-cutting and #welding steel with an oxyhydrogen torch. And MELTING TUNGSTEN. And a crude version of the Birkeland-Eyde process, assayed with calcium carbonate. #bootstrapping #materials
on 02016-10-10jokey #Video of mining and timber-framing a mine by Cody, the #CodysLab guy from Logan, Utah, who refined diamonds and platinum from the street. Demonstrates assaying efflorescence for nitrate with charcoal and a modern Geiger counter, showing that the radioactivity inside the mine is four times lower than outside, 0.02 μSv/h. #bootstrapping
on 02016-10-10Raph #Levien #video on writing a modern editor in #Rust. #toread
on 02016-10-07#video by Micah Elizabeth Scott on #reverse-engineering a Wacom tablet by glitching its power rail to get its firmware
on 02016-10-03#Excel #finance #video of Martin Shkreli analyzing eBay
on 02016-10-02You Suck at #Excel, by Joel Spolsky: tip #video, from which I learned #Gnumeric tips including double-clicking on the bottom of a range to autofill down to the end of the current table (including by-example numeric sequences and date sequences), Paste Values (part of Paste Special in Gnumeric), Paste Special Add, Paste Special Transpose, F4 for point-and-click absolute cell references, & for string concatenation, ^` to toggle formula display, R1C1 mode (under Format → Sheet in Gnumeric), Format Cells Text to avoid numeric interpretation on input, conveniently naming cells and ranges, MATCH/INDEX/VLOOKUP/HLOOKUP,, ^$ and ^% to format as dollars or percent, ^; to insert today’s date, and Tools → Goal Seek (which I didn’t know about, but which can numerically solve equations). Also it looks like the ribbon interface, the updated autofilter interface, and Excel’s new tables feature are super convenient. Spolsky’s Excel style is a lot more mouse-driven than Shkreli’s, and he seems to be missing some basic stuff like TAB to move to the cell to the right and not trying to enter dates as formulas. A really great user demo of data-first, structure-later systems.
on 02016-10-02#screencasting #video of writing a version of Pong in #JS with <canvas> in 5’30" #video-games
Some people in #Portland, #Oregon flew #drones over hobo encampments (nascent #slums) in the river delta and posted #video
on 02016-08-02A compiler from shapes to patterns for industrial #knitting machines. Notable that the #paper is actually larger, at >16MB, than the (640×360 version of the) #video, at 11MB. (There’s a larger video that’s 1280×720, though.) They’re able to directly knit fairly impressive plushies.
on 02016-07-24Soapstone (#talc) “evaporator” humidifier, plus a soapstone trivet and soapstone-topped stove #video #materials
on 02016-06-30#video of Esteban Quispe, Bolivian robot inventor, and his robots made from trash. #hardware
on 02016-06-30#video about the Chairigami store, originally intended as “Legos for #cardboard #furniture #design”.
on 02016-06-29#cardboard #furniture #design #video of Adrian Candela’s glueless DIY “Nit” nightstand and a couple of other simple designs.
on 02016-06-29Holy shit, you can smelt silicon out of sand by reducing it with aluminum, ignited with an aluminum-sulfur reaction and magnesium strips. #materials #video
on 02016-06-29#video of nerdear.la in #Buenos-Aires. Wait, there’s a Museo de Informática here?
on 02016-06-29#video on #kinematics based #generative design of animatronic characters by #optimization of #linkages, research from #Disney
on 02016-06-27J1a SwapForth #video by jamesb beckman101, demonstrating synthesizing the CPU from #Verilog with #IceStorm. Looks like an IceStick. Demonstrates programming it interactively in a tiny #Forth with only 227 words (and a filesystem!) and generating a nice stable 1MHz square wave in software, displayed on his digital oscilloscope. #J1 #hardware
on 02016-06-22#video of the “no contact jacket”, which is a high-voltage stun gun built into a jacket so that you can escape people who try to grab you
on 02016-06-21A 15-hour #video #MOOC on #machine-learning from 2014 with an #ebook
on 02016-06-21Vinay Gupta #video on the #DAO #Ethereum catastrophe
on 02016-06-21sped-up #video of injecting (331 bytes of) code into a Super Mario Brothers game on the SNES to morph it into a Flappy Bird game.
on 02016-05-24#video of tactile rendering of 3D features by vibrating the screen according to where your finger is in order to vary the friction
on 02016-05-02An interview #video with Richard Bartle, part of the materials recorded for Jason Scott’s documentary GET LAMP about #interactive-fiction #video-games, talking about the history of #MUD software, which was multiuser interactive fiction.
on 02016-04-29Juice Jam gameplay #video
on 02016-04-29a Peugeot 406 advertisement #video from 2008 that makes my hair stand on end
on 02016-03-03Generative lyrics #video #art for the song “Stickup”, by Raven Kwok
on 02016-02-18Kathryn Myronuk’s #video explaining exponential technologies.
on 02016-02-11Aliaksei Zholner’s working V8 engine powered by compressed air made entirely of paper and Scotch Tape is the most adorable engine I’ve ever seen. It even has the characteristic sound of a V8 ICE. #video
on 02016-01-12#video about #Sesame-Credit social engineering gamification system in #China #politics
on 02015-12-23Michael Hansmeyer designing fractal columns through some kind of computational origami, then constructing them by #laser-cutter. He’s written a couple of papers on the topic but none of them seem to be online. #video
on 02015-12-14#video on the ARL’s Very Affordable Precision Projectile (VAPP) #weaponry, which turns mortar and cannon shells into cheap precision-guided munitions using a single GPS sensor and a single linear voice coil actuator to control canards mounted near the nose of a spinning shell, which is stabilized with tailfins.
on 02015-12-10Adam Kumpf #video of Teague Labs’s one-handed chording keyboard #UX on an Android multitouch tablet screen.
on 02015-12-03#video for CHI 2015 (#UX) best paper on proprioceptive interaction by electrical stimulation of muscles, called “Pose-IO”. It moves your body by electrically shocking you.
on 02015-12-03Business Insider #video claiming #Daesh has a (probably nonworking) ballistic missile. #weaponry
on 02015-12-01#video describing “FlatFab”, proprietary (but CC-BY licensed!) research software for design for #planar #3D #manufacturing. Doesn’t seem to incorporate flexures, but does do some physical modeling.
on 02015-11-30#screencasting #video of a guy trying to #reverse-engineer the electronics in my LG KP110 #phone using “miracle box by Gsmcampus Team”, which apparently has an auto-scan feature for finding pinouts.
on 02015-11-30#video of #machining a bronze part for an eccentric drive mechanism on a manual #lathe and milling machine. He spends 20+ minutes getting it set up in the right position. Lots of time spent on workholding, dimension transfer with adjustable parallels, centering, indicating, deburring, that kind of thing. The author, Tom Lipton, talks slowly and clearly enough that you can play the videos at 2× with no problem.
on 02015-11-22short #video of diving into a diving bell made of a net and plastic membrane.
on 02015-11-22Gorgeous #video of non-circular #gears made on a #laser-cutter. #2d-cutting
on 02015-11-22#slow-motion #video of #agriculture weeding #robots running #ROS.
on 02015-11-22an hour-long #video lecture on the #history of #China with very good Mandarin pronunciation (by 羅振宇) and SUBTITLES! This covers Qin Shi Huang.
on 02015-11-19#video of fastest by-hand #piano #music is about 12 to 19Hz.
on 02015-11-11Martin Benitez from #Maciel. Mostly #video-games #video stuff.
on 02015-10-30Vint Cerf on his "digital vellum" #archival project and how it’s related to the OLIVE project led by Mahadev Satyanarayanan at CMU. #video
on 02015-09-29A 2009 #video lecture series on #mecheng manufacturing processes by “nptelhrd”, Prof. Inderdeep Singh at IIT Roorkee. Some problems with the audio, seems to be a bit clipped. However, the video is entirely a talking head and a bunch of PowerPoint slides, so the only way you would watch this video to learn about powder metallurgy instead of reading a book is if you are dyslexic or have a beard fetish. At least it doesn’t have shitty elevator music.
on 02015-08-28#video on how “oldschool” #hardware #graphics worked, like the Commodore 64 and the Nintendo NES. Doesn’t really cover character-generator displays.
on 02015-08-19"Applied Science" is Google employee Ben Krasnow, who does awesome science #video demos: bending wood with ammonia, using his home electron microscope to take stop-motion videos of a record being played by a pickup, an experimental rocket motor using acrylic and gaseous oxygen, the perennial favorite of homemade silica #aerogel, supercritical CO₂ caffeine extraction, etc.
on 02015-08-1610MB catalog of Đức thắng Nguyễn’s #mechanical mechanism #video illustrations, in three PDF files, organized by topic. Including, say, a dozen or so designs for continuously variable transmissions (#cvt), a bunch of negative #stiffness mechanisms, and so on. Entirely rigid bodies as far as I can tell except for the occasional coil or leaf spring.
on 02015-08-15Đức thắng Nguyễn has made #video illustrations of 1700 #mechanical mechanisms over the last 13 years.
on 02015-08-15A #video of a mechanical demonstration of #Braess’s paradox using the #stiffness of springs.
on 02015-08-14Another #news #video montage of the #Tianjin #explosion. You can see blast shrapnel from a wall on its way to obliterate the first cameraperson.
on 02015-08-13#news cellphone #video of a large #explosion in #Tianjin yesterday
on 02015-08-13#Polar-3D is a #CNC #3D-printer using polar coordinates to get multiple print heads, which don’t have to move, and avoid linear actuators and linear bearings entirely, except for a Z-axis which raises and lowers the whole table, including the motors. Also, the platters provide precisely known movement for a laser #3D scanner, thus avoiding #photometric-stereo and the like. #video #manufacturing
on 02015-08-13#Video of Dan #Gelbart's uniflow #steam-engine #engineering #hardware
on 02015-08-13another cheap #CNC machine made with drawer slides for the linear translation, and mostly lots of plywood with some square tube stock to stiffen it. Big NEMA steppers though. Hose-clamp U-joints made with fuel line. Noisy as hell. He’s got a Black-and-Decker clone of a Dremel tied down with hose clamps in the middle. More Allthread for the linear actuators. Powering the motors off cat-5 cable. #video
on 02015-08-13#video demonstrating and explaining the construction of what surely must be the world’s most frugal large homemade #CNC #machining #hardware. Roughly 100μm repeatability over 50×50 cm. He uses threaded bars (Allthread) lubricated with used motor oil for the linear actuator, bare cartridge bearings as wheels. He uses low-power and therefore very slow (2mm/s) DC motors with an optical quadrature encoder (perhaps salvaged from a printer) for feedback, controlled by H-bridges from Arduino. Plastic tube couplings for U-joints on the threaded rods. A goofy little C program on his Linux box to control the Arduino. Calibrated against an inkjet printer. Engraves glass with a diamond milling cutter mounted in a flexible coupling to void breaking things. Cuts a Styrofoam wing cross-section with a soldering iron. Cuts gears from acrylic or aluminum with a milling cutter (like a Dremel mounted with hose clamps). Superb how-to video. By Norbert Heinz.
on 02015-08-13