#video on desoldering #electronics #toread
#video #toread on #manufacturing a #cold-plasma torch
#video on the hazards of #3D-printing with carbon-fiber reinforced filament #toread
#video on lithium hydride reducing agent #materials #toread
#video on square nuts for #3D-printing inserts #toread
#video on graphite #weaponry against power lines. Low-quality animation.
John #Carmack on a style of programming where you inline all your code and do not use any subroutines. “As an additional confirmation of the point of the article, a couple years later when I was working on the Doom 3 BFG edition release, the exactly predicted off-by-one-frame-of-latency input sampling happened, and very nearly shipped. That was a cold-sweat moment for me: after all of my harping about latency and responsiveness, I almost shipped a title with a completely unnecessary frame of latency.” #latency #real-time #responsivity #games #video-games #software-design
#video #toread on #manufacturing #ethylene #materials automatically by #Hyperspace-Pirate
another #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.
#video #toread on #manufacturing a water-cooled bed
"Visidata" is a spreadsheety GPL3 data visualization #TUI program that looks pretty impressive. #infovis in #Python, supporting #TSV, #JSON, #CSV, #SQLite, #Pandas, and #HDF5
#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.
#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
#video on #manufacturing a 2-stroke engine from mostly raw materials but also a piston and connecting rod
#video on bending #wire with a wire bending jig for #manufacturing fishing lures #toread
#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.
#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.
#video #toread on #manufacturing a #wire bender
#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".
#video #toread on #3D-printing a #wire bending machine
#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.
#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
#Shake-the-Future #video on his “print-wave casting” #manufacturing technique with #3D-printing
#ebook of the Tiangong Kaiwu, the famous 16th-century Chinese book on technology