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Brian,
As I recall you got a Parker O-Ring Manual, correct? In
it, or any other manuals on O-ring applications, you will find either
tables or recommendations for O-ring squeeze. It's the difference
between the O-ring thickness and the thickness of the remaining groove when the
two mated surfaces are put together. Follow the guide for a "Static
Application." They usually give the example of a flange seal where two
pipes are joined together with bolted pipe flanges. Your hatch is the same
thing.
There is one alteration to the standard groove that is
helpful in a hatch seal. When machining the inner diameter of the groove
for the O-ring, it helps to put a bit of an angle on it sloping into the
groove to better retain the O-ring when the hatch is opened. Put about a
10 degree angle on the inner diameter wall and size the ring so it is a bit
smaller then the diameter of the groove so it snaps in similar to an elastic
band around a rolled up bunch of papers. Not so much stretch as to reduce
the cross section of the O-ring but enough to hold it in the groove.
How are you going to machine this on a table? Either
chuck it in a lathe, or a rotary table on a miller or a machining
center.
Brian, I don't want to sound critical, but are you sure your
ready for welding parts together? It's real easy to work yourself
into an expensive corner if your assembling before you have the design details
worked out.
Good luck, Dan H.
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