The o rings have probably been cleaned and baked, a stopper could have enough residual material inside it (like a sponge holding water) that it would outgas so much that it looks like a leak -- i.e. virtual leak. You could find some vacuum-friendly epoxy (vacseal) and fill a narrow hole in a flange but everyone I know who tried to roll their own UHV parts gave up or regretted it. It's so picky that there is a reason stuff is expensive. Surplus is a great option as long as you can get the parts super clean.
Andy On Aug 29, 2014, at 1:04 PM, "Jerry Biehler" <[email protected]<mailto:[email protected]>> wrote: It will leak. I guarantee it. If not you will have a virtual leak. Vacuum design is not easy, especially at this level. I have a couple small 3 pin feedthroughs you can have. What kind of voltage are you working with? Current? -Jerry On Friday, August 29, 2014, Nathan McCorkle <[email protected]<mailto:[email protected]>> wrote: On Fri, Aug 29, 2014 at 12:48 PM, Jerry Biehler <[email protected]<javascript:;>> wrote: > If you are trying to get to 10^-8 right now forget the stopper. It is never > going to happen with a seal like that. How many connections do you need? What > kind of pump are you using to get that low? What kind of chamber? Oh, why not? I mean, the seal on the blocking plate is just a Viton o-ring... The setup is an FEI 200 xP, it's got a roughing pump, a turbo, and a ion trap. I need at least 3 wires to begin, I might be able to get away with 2 if I use the feed-through metal for the ground. _______________________________________________ dorkbotpdx-blabber mailing list [email protected]<javascript:;> http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber _______________________________________________ dorkbotpdx-blabber mailing list [email protected]<mailto:[email protected]> http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
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