The Shop > Composites & Plastics
DIY Vacuum & Heat Chamber
Bluechip:
Ant
Thanks for the info, although the Vacinnovation site seems a bit sparse :scratch: . I will have to try my pump. I have a vacuum guage, but it's calibrated in Ins. Water rather than Mercury.
My compressor gives up to 110 PSI, 8 CFM FAD .. is at big enough ?
Dave BC
usn ret:
Ant, when I was in the Navy more years ago than I care to reveal, we tested barometricly release mechanisms from aircraft ejection seats using a vacuum box. I recall we used a vacuum pump from a refrigeration service kit. We run it to a simulated altitude and do a release to complete the test. The box {6" x 6" x 18"} was aluminum welded together to form an open top container with a rubber seal on the upper lip. We then laid either a very thick piece of glass or plexiglass against the seal, as the vacuum increased the seal became tighter. There was also a manual valve to release the vacuum after the test. Our indicater was an aircraft altimeter so I don't know how much vacuum we actually pulled. I hope this helps with future designs. :smart:
Cliff :beer:
ant...:
Dave - 110psi is more than enough. The vacinovations site is very sparce but their stocks are large and prices are low, thats why I always go there.
Cliff - That was the first idea i came up with but with a perspex box. Finding the rubber seals always lets me down.
usn ret:
Ant,
Something to think about for a seal. A release agent on the glass/plexiglass top . Next a bead of silicon sealant on the top/mating edge of the box. Place the glass on the box until the sealant is cured, them maybe a good seal?? :smart:
Cliff :beer:
ant...:
Cliff
Thats clever, i hadnt thought of that. Silicone does need air to dry though, so it would need to be a thin layer, and I think i would use a good layer of grease as the release agent.
As it happens i used silicone on the rim of the pressure cooker but even after 12 hours of drying, when I put the lid on and did a test the silicone stuck to the rubber seal.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version