Definitely NOT cat dryer. The glass is rather thick and will hold a lot of stress.After drilling, put it back to oven for 20min. As it is temporary, and we needed it immediately, we reused the existing gasket, and made a new lid out of a 1" X 16" acrylic plate. Making a box a lot bigger as needed and then experimenting whether it’s up to the pressure would have been more usefull, and maybe even a bit spectacular.Hello I am trying to achieve a near perfect vacuum in a small (12 x 10 x 6 in) aluminium box and was wondering if anyone had recommendations on what pump will achieve this. At -29.9" Hg gauge, there is about 1/16" lid deflection in the middle, so a thicker plate would be better to reduce high cyclic fatigue.
You can always go another route, though – Helpful hint – don’t forget when you build these things that there’s a *lot* of air pressure trying to make this into something that looks more like a pizza box.For example, if you pull a modest 5psi vacuum inside a one-foot-cube chamber there’s more than 4000 lbs of “squish” from the outside trying to undo your work.That is so true, but I never would believe it, Because you dont think the air pressures there because your perfectly safe in it.
It’s much better for cases where there might be a failure mode.I’ve found that the glass plate from old microwave ovens will make a good vacuum plate – the top surface is flat, turn it upside down and use it as a lid. It can be used for all manner of purposes, from science experiments to degassing paints and epoxies.
Should help with stress buildup recovery.Those cheap vacuum gauges can be tuned if you take them apart, down to the point of exposing the “clockwork” or the units, bend the needle up so it cannot hit the peg and then do some careful subtle bending to the main curved “tube” (usually copper) until the relaxed state of the needle is to rest at zero then straighten out the needle so it rests gently on the peg. Insert pipe into fitting and apply heat. This great video by Black Beard Projects shows you a very inexpensive way how to build/diy vacuum pump & chamber with a fridge compressor.The refrigeration compressor in an old or broken refrigerator/freezer or air conditioner may be used as a low cost vacuum pump for low vacuum applications.When used as a vacuum pump, the compressor no longer receives the lubrication or cooling that was provided by the refrigerant.With my particular compressor I’m able to pull -27.5 inHg.The ball valve between the chamber and the compressor was not needed at the end, the compressor must have some kind of one way valve so even when it’s turned off it does not let air in.// This website uses cookies to improve your experience on this website,by using our site, you agree to these terms. A trick to put some desired hysteresis in the circuit is to allow a bit of current to bleed off the switched circuit and into the control input through a high resistance resistor.DC12V Auto Circuit Modifications Voltage Comparator LM393N Remote Control ( ~$7 ) Details about Pressure Transducer, Vacuum Pressure -14.5 to 30psi, Can Work for Boost Vaccume (~$15.50)As it is it’s just a presentation that it is possible to suck some air out of a wooden box.Calculations are … a bit difficult because reliable numbers of the strength of plywood are hard to come by.
(Other than the chamber, silicone sheet & vacuum pump, the things on this list are more for reference.
This affordable DIY vacuum chamber kit includes all machined brass fittings, including a pet cock exhaust valve, a plastic hose and hose barb to connect your vacuum pump, a vacuum gauge, a pair of matched rubber gaskets, and a set of ½-inch clear acrylic plates.
Or if the one in the video is enough then a link.
Combined with an electric pump, the vacuum chamber passes its tests with flying colors, completely ruining some marshmallows in the process. This helps to make the box airtight, as well as improving the aesthetics.