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Frank, No half round. O- ring
should have space to deform. The wall on the smaller diameter can be tapered to
keep the o-ring in. Better but more difficult to make. You are using a bit large
diameter; I think the rubber should be softer than the normal 70 Shore quality.
Otherwise it will be difficult to tighten the hatch. Regards, Emile Van:
owner- 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 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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