#video on #jugaad #aluminum-air #batteries #toread
on 02026-08-24#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 channel on YouTube about #hoarding and #DIY/#jugaad
on 02026-05-15#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#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 02026-04-14a #jugaad macro photography lens made by #3D-printing an adaptor for a (US?)$20 4× microscope objective lens to take pictures of aphids and other tiny insects on leaves using focus stacking. #photography
on 02026-04-14#video of a man-powered #jugaad forklift from scrap #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 02026-04-11#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 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#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#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#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 02025-10-18#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#Tech-Ingredients #video about #jugaad #laser directed-energy #weaponry against #drones #toread
on 02025-10-18#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 02025-09-27Cromemco used a 1-kilobit DRAM chip for their first digital camera sensor! #electronics #hardware #history #jugaad
on 02025-09-15#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 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 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#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