|
Hey Brent. Keep thinking, dreamers are good.
Still, you're beating a dead horse. I can see where the welded ring thing
may be cheaper/easier on a big square door for a hyperbaric chamber but for a
round sub hatch.....the $300 machinist's bill was a no brainer.
Another note about the hatch groove as mentioned by Hugh, the bottom of the
groove needs a little radius there so that when the pressure gets really high
and the "O" ring is deformed into a slightly rectangular shape, a sharp corner
at the groove bottom will damage the "O" ring. I got this from the salesman at
Parker when I was getting all the info to do my hatch.
The surface of the groove and matching land needs to be as smooth as
possible too. The Parker book has a LOT of good info there. Well worth a
read.
On the "purchase" of the "O" ring......I was directed to an authorized
dealer and ended up paying $75 for 2 "O" rings. They really wanted me to buy 200
of them. Much better to get them from Mcmaster-Carr.
I will possibly get a dove tail added to the groove later and get new "O"
rigs just slightly smaller so they stretch into place. As several guys have
said, there's a "stretch" factor to be considered and a "squeeze" factor too.
All that info is in the Parker book. Frank D.
|