#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#lab #tutorial #video on #vacuum filtration by #Waikato #toread
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#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#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#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#ebook #toread Procedures In Experimental Physics, by John Strong. “Many procedures for the #physics lab, including: glass-blowing, high #vacuum, electrometers, Geiger counters, optics, heat and high temperature, and [#manufacturing] techniques. Profusely illustrated by Roger Hayward.” #CC #public-domain because 01938 copyright not renewed
on 02024-06-24#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 02024-04-28list of all 27 (new) Bell Jar issues on #vacuum #DIY
on 02024-01-25why #STM #microscopy is usually done at ultra-high #vacuum (picotorrs). Handy chart: roughly XHV = attotorrs, UHV = picotorrs, HV = nanotorrs, MV = microtorrs, rough vacuum = millitorrs. “At a pressure of 1×10⁻⁶ Torr the crystal surface will be contaminated with a monolayer of gas in 1 second.”
on 02021-11-11#FIB #vacuum #machining #paper from 01999, “A review of focused ion beam milling techniques for TEM specimen preparation”, Giannuzzi and Stevie
on 02021-11-11#vacuum levels
on 02021-11-11#SEM #microscopy #introduction, covering issues like critical-point drying, field emission vs. thermionic, magnetic astigmatism, secondary electron noise, #vacuum, etc.
on 02021-11-11#PDF #history of #vacuum devices
on 02021-05-29Michael D. Wheeler talks a bit about his glass #vacuum oil diffusion pump, ‘presented at the American Scientific Glassblowers Society symposium in Seattle, WA, in June 1995. The “Proceedings of the A.S.G.S. 1995 Sumposium”, “4" Glass Oil Diffusion Pump”, by Michael D. Wheeler, pages 24-30, carries the full publication.’
on 02015-12-27Michael D. Wheeler talks a bit about his glass #vacuum oil diffusion pump, ‘presented at the American Scientific Glassblowers Society symposium in Seattle, WA, in June 1995. The “Proceedings of the A.S.G.S. 1995 Sumposium”, “4" Glass Oil Diffusion Pump”, by Michael D. Wheeler, pages 24-30, carries the full publication.
on 02015-12-27#PDF overview of #vacuum technology for the amateur, explicitly intended for #bootstrapping.
on 02015-12-27the #history of #vacuum technology, covering the development of pumping and the otherinventions that depended on it, designed for #bootstrapping a vacuum-capable lab.
on 02015-12-27