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Parker's O ring catalog has the exact dimensions of the O ring
grooves.
Brian
----- Original Message -----
Sent: Sunday, August 26, 2007 14:49
Subject: RE: [PSUBS-MAILIST] viewport
groove
Frank,
I'd recommend
you look up specifics in publications like Machinerys Handbook, but when
you do you should find the recommended groove to be rectangular, with
width and depth about 1.5 and 0.8 times the diameter of the ring section. On a
sub, it's common to make the inside diameter of the groove slanted, so
that it will retain the o-ring. You don't want the o-ring sticking to the
hatch land and dropping out of the groove when you open the
hatch.
rgds,
Alec
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I'm looking for a local machine shop to gouge the ''O'' ring groove for
my hatch. The designs I've seen look like a square groove accepting a round
''O'' ring. Is that what the accepted style is, or is there any advantage to
making it half round? The groove and associated ''O'' ring are to be 22 inch
diameter. I can get the ring locally.
Wouldn't a square groove leave too much unfilled space in the corners so
that the ring when forced down by the hatch under pressure would be squashed
into the square and not provide enough of a seal?
My son-in-law , who owns a machine shop, told me that most ''O'' ring
grooves on a flat flange type connection are hollow ground so a small collar
at the top keeps the ring in place. I'll be using a 1/2 inch cross section
diameter ''O'' ring and he recommended a depth of 5/32 inch, and again,
slightly smaller at the top. Frank D.
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