I worked on a project like this once. No screws at all. Rather then a 0.1 PSI over pressure. the interior was flush with dry gas then pumped out with to a crude vacuum with a hand pump. Air pressure alone force the cover plate on. OK a couple screws where there just to aid in assembly but the cheap $12 hand pump was good enough.
"high vacuum" requires expensive equipment and is a black art but "crude vacuum" is easy, easier then holding a pressure because the forces are pushing the seal together for you. On Thu, May 18, 2017 at 2:46 PM, jimlux <jim...@earthlink.net> wrote: > On 5/18/17 1:34 PM, cdel...@juno.com wrote: > >> Well that generated a lot of advice and thanks for it! >> I think I might do it myself and go with a 1/2" hole depth and 1/4" >> threaded depth. >> I'll get some of that Aluminum Tap magic, some new taps and new drill >> bits. >> Good idea about drilling the end plates first and drilling thru to match. >> Between the end plate and the tube is a gasket that needs to seal >> pressure and moisture tight. That's why I used 5 per side. >> > > I would make the end plate "real thick",with a machined groove for the > o-ring, and use some sort of latches to hold it in place, rather than "lots > 'o screws". Unless you've got a real tight space constraint. How much > pressure do you have to hold? That will determine the clamping force needed > on your gasket (and potentially, on your fasteners). Do you need the full > 4.5x4.5" inside clear space? A 1/4-20 bolt in the corner might be a good > way to go. > > There's also inexpensive surplus vacuum equipment around, as well as run > of the mill plumbing. Unless Steel (stainless or not) isn't an option. > > > > > > >> Will let you know how it turns out. >> >> Cheers, >> >> Corby >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.