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Hi All, Been working on my hatch, had the ring welded on
to the hemisphere by my neighbor ( who did the most professional weld job I've
ever seen ! ) . Anyway, spent the afternoon fitting up a support table so
I can machine the hatch cover true and flat. As it is it's only 30
thousandths off. Then I will need to machine the hatch seat.
Since I have never actually seen a hatch, other than in
pictures, I feel at a bit of a loss as to certain aspects
of the hatch. Like I need some type of "o" ring right? Or will the
hatch seal if self if both mated pieces are perfectly
true? I'm having a little trouble with physics of the
hatch seal. With an "o" ring , like in a thru hull fitting, the sealing
action of the "o" ring works because water pressure is pushing the rubber "o"
ring tight against the surrounding wall, But with the hatch you have the
large area of the hatch pushing the whole hatch against the hatch seat - the "o"
ring or gasket is not acting the way it would be in a thru hull fitting.
Would the specs for the squeeze on "o" ring be different than on a thru hull
fitting? Any comments would be greatly appreciated.
Brian Cox
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