“Webinar - Analog schematic capture & simulation with Stefan Schippers”, who wrote Xschem. #Efabless #Tiny-tapeout #video #toread #electronics
#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
#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.
#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.
#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).
#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
#video #toread about how insurance prohibits diving boards at most swimming pools in #USA now #collapse
#video of #AOC speaking to criticize Charlie #Kirk in the House. #politics #USA
#video #Chinese about hipper alternatives to “ni hao”, such as “chī le ma” and “zao” and “ha luo”.
"Claytronics" was CMU’s smart-dust system from 02007.
#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.
#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.
#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.
“The Prehistoric Bone Tool Assemblage from Grivac (Central Serbia)”, January 2013, by Selena Vitezović, Archaeological Institute of Serbia, including an antler retoucheur (“retouching tool”). #archaeology #scouting
“Retouch is the act of producing scars on a stone flake after the ventral surface has been created.[1] It can be done to the edge of an implement in order to make it into a functional tool, or to reshape a used tool.” #archaeology #scouting
“the last known Native manufacturer of stone arrowheads (...) Ishi, which means “man” in the Yana language, is an adopted name. The anthropologist Alfred Kroeber gave him this name because in the Yahi culture, tradition demanded that he not speak his own name until formally introduced by another Yahi.[2] When asked his name, he said: “I have none, because there were no people to name me”, meaning that there was no other Yahi to speak his name on his behalf.” #archaeology #genocide #human-rights #history
#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.
29' #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
#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.
Press release about Thierry Besson’s "Wildebeest" FPGA HDL synthesis tool for designing #electronics #hardware, released under an Apache 2.0 license. “Zero ASIC, a U.S. semiconductor startup on a mission to democratize silicon, today announced the release of WildebeestTM, the world’s highest performance FPGA synthesis tool.”
#USA #politics #ICE beating up US citizens and legal immigrants, apparently because they’re brown. #human-rights #racism