thermite #materials powered hotdog heater by #Thought-Emporium #video #liststart
some kind of weird #mechanical car contraption by Tom Stanton; he’s using an E-Z Spin motor (#lasersaber style, reed-switch commutator with a permanent-magnet rotor) to charge up a cap which then spins the motor. Then he runs it off a Peltier thermoelectric generator.
rotary #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
did Cilantro always taste like soap? #video
“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
incorporating 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
making 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
#manufacturing nose-picking brass automata with pewter-casting in silicone, among other things #video
#Mikhail-Varshavski correcting mistakes in his medical videos. #video
#Mikhail-Varshavski reacting to “Bear Grylls” questionable tips. #video
#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.
#Mikhail-Varshavski “reaction” video to “Osmosis Jones” #video about I guess a kid’s movie?
#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.
#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
#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
#Backyard-Scientist gallium versus a high-pressure compressed gas bottle: gallium wins #materials #video
#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
sterilizing your hands with ozone from a 200kV corona discharge portable Kirlian photography setup (not explained) #video
#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)
#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
150kV 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
#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.
#Steve-Mould on the “portal illusion” with helices #video
#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
#manufacturing DDNP poof-powder #materials (01969 Army field manual procedure) #video
conical slicing for FDM #3D-printing without support material #video
solid-state dehumidifier for #3D-printing #video. It uses electrolysis to pump hydrogen through an ion-selective membrane out of your dry box.
#Clickspring on #manufacturing carbon steel hairsprings for #mechanical watches #video
#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
#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
#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.
#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
#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
#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
the 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.
6 #materials processes that “changed the world”: #video of apparently 100% talking-head and stock footage garbage by "Breaking Vlad"
#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.
Pawn Stars Aztec #death-whistle #video appraised at US$5000
making #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.
bringing 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.
coppiced willow for living fences, weaving baskets, feeding goats, etc. #bootstrapping #video
#StuffMadeHere fixing a little mess with a big mess #video #toread
#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
#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).
#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
#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
cheap 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°.
DIY 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.
salvaging 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.
recycling 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?
#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
#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
#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
top-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
#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.
#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
#Prusa-3D #electroplating after #3D-printing, with some simple instructions but no electrolyte recipes. #video
DIY 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
#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
#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
#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.
#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”.
#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
adding 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
#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.
Yi Zhi Zhu is making robots from taxidermy; this #video is full of bullshit text though
#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
“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
self-propelling ionic wind #flying wing #video (well, not quite self-propelling if we require lift; it rotates a mobile containing itself)
why is sulfuric acid the king? #materials #video
piranha solution recipe #materials #video. fairly spectacular demonstration of how it annihilates cotton, sugar, latex, nitrile, old T-shirts, etc.
extracting iodine from povidone iodine #materials #bootstrapping #video #toread
problems 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.
high-entropy metals as alternative alloys to steel #materials #video
how to purify acetone #materials #bootstrapping #video #toread
glacial acetic acid #materials #video. Incomplete, he just purifies sodium acetate and sulfuric acid.
recrystallizing 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
extracting sulfur from pyrite #materials #bootstrapping #video #toread. Ugh, now the video’s been taken private! #censorship
decarbonating bicarbonate into carbonate #materials and then recrystallizing them. #bootstrapping #video
#bootstrapping foxhole radio #hardware #video sucks, clueless, not worth watching
#Nighthawk DIY solar thermal panels #bootstrapping #energy #video #toread
#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
#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.
#Nighthawk fireproof expanding graphite #video #toread
#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.
#Primitive-Technology #bootstrapping fired-brick hut #materials #video #bushcraft
“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).
driveshafts #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.
#3D-printing bores #video #toread
#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.
#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
#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.
why doctors hate trampolines #video (basically injuries)
#ElectroBOOM on electromagnetic pulses #video #toread
do people use electromagnetic pulses maliciously? #video of almost entirely talking-head and stock-photo filler
#History-channel acid dangers #video #toread
producing #cooling from my pee by reacting with Birkeland–Eyde nitric acid #video #bootstrapping #materials
Tungsten, Periodic Table of Videos #video mentions that phone vibrator motors use tungsten weights!
#Eater Dickson charge pump voltage multiplier #hardware #video
DIY 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
#Andy-Ward warns of dangers of caliche for #ceramics #video #toread
#mechanical chainless string-drive #bicycles #video
#Andy-Ward on four types of “wild” clay for #ceramics #video #toread
#Andy-Ward on wet-processing “wild” clay for #ceramics #video #toread
#Nighthawk 6 uses for a 90% medical oxygen concentrator, mostly fireworks like senko hanabi, but also using steel brake lines for poor thermic lances and an oxypropane torch, and finally a macaroni rocket/thermic lance. #hoarding #bootstrapping
#TKOR firing #ceramics on a barbecue grill #bootstrapping #toread #video
#Andy-Ward demolished his primitive #ceramics kiln because he likes firing in an open fire better #video
recycling thrift-store jewelry by melting it down #hoarding #video #toread
making a #ceramics kiln out of an old oven, but he could only get it to 820°. #video #hoarding #toread
#Andy-Ward sealing and cooking in unglazed earthenware #ceramics #bootstrapping #toread #video
#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
how to render and purify tallow #toread #bootstrapping #video
making simple pendants from scrap glass in a microwave kiln #video #toread
against 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).
#Mikhail-Varshavski reacts to medical TikTok controversy #video. Basically he wants to get more doctors and nurses on social media to counter misinformation.
copper 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
distilling 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
#Mikhail-Varshavski on first-aid hacks that should be illegal #video #vapid
#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
using the Kitab Al-Asrar by Al-Razi (Rhazes) #Fraser-Builds fixes his clay for #ceramics. #alchemy #video #toread
#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
a 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
#manufacturing a very nice basket from pine needles and thread #bootstrapping #video #toread
#manufacturing soap from wood ash and fat #bootstrapping #video #toread
#Andy-Ward #bootstrapping #ceramics into #manufacturing a mug #video #toread
#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
carving 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.
motorcycle-club president Mark: why was I arrested if I’m not under arrest? #true-crime #video
the witness is actually the murderer #true-crime #video #toread
Jeff benefited from the interrogation #true-crime #video #toread
Joshua Young murder interrogation #true-crime #video #toread
Randy Herman murder interrogation #true-crime #video #toread
Jeffrey Scullin murder interrogation and confession #true-crime #video #toread #todelete
dumb criminal, terrible liar #true-crime #video #toread
#machining a crazy (helical) part on the lathe from brass by moving a jaw on a 3-jaw chuck #video #manufacturing
#Mikhail-Varshavski “reaction” surprisingly accurate medical memes #video #vapid #humor
the power of time #video super boring
#Mikhail-Varshavski “reaction” to true ER stories #video explaining things like anaphylaxis and thoracotomies
#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.
#Inheritance-Machining “trying to save my busted lathe” #video #toread #machining
hand-engraved metal computer mouse #video #toread #machining
reinventing calipers with tiny sculpted brass hands and human foot and a micrometer thread with a half-nut, a quick-release micrometer #video #machining #metrology
#manufacturing a springless air-powered graver #video #toread #machining
#manufacturing an unnecessarily complex geared mechanical pencil #video #toread #machining
mythbusters were wrong about falling coins killing people? #video #toread #vapid #clickbait
graphite #dorodango #video #toread
cutting shiny aluminum foil ball in half with a waterjet #video #toread
#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!
squishing shiny aluminum foil ball in hydraulic press #video #toread
shiny 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.)
Leinen 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
using carbide inserts in a homemade dovetail cutter #machining #video #toread
top 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.
5 more excellent ways to die arc welding at home #video #toread
#Andy-Ward #manufacturing an earthen oil lamp #bootstrapping #ceramics #video #toread
#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
“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
#Andy-Ward on how to “make” clay. #ceramics #video #toread #bootstrapping
#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.
#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.
a bear trap that can cut you in half, or cinder blocks, ballistic-gelatin dummies, cow bones, etc. #video #Backyard-Scientist
what if Formula 1 had no rules? #video rather dull, didn’t finish it
Voith-Schneider and ABB Dynafin cycloidal propellers #flight #engineering #video #toread
Fibonacci 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
#Thought-Emporium aluminum foil and highlighter ink to make #lasers with a TEA pump #engineering #video
#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!
#Mikhail-Varshavski laughs at funny medical memes #video #vapid #humor
encephalitis lethargica paralyzed 5 million people into living statues #video #toread #history
animating 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
From Newton’s method to Newton’s fractal #video #math #toread
#Krasnow #Applied-Science DIYing and testing a nuclear quadrupole resonance for #materials identification #video #toread
#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
#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
#Mikhail-Varshavski “reaction” to “extreme cheapskates” #video #toread