[PSUBS-MAILIST] hatch pin

[hank pronk via Personal_Submersibles]

Sean yes it is conical, but when I close it with the o-ring, it does not close tight metal to metal and with the play in the hinge I feel like it is not closing evenly when I do the vacuum test.  I am probably worrying about nothing, likely the hatch is not completely seated metal to metal under vacuum.  I am talking 

   

 On Tuesday, March 22, 2016 10:18 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 What type of misalignment exists? Aren't you using a conical bearing face on your hatch? That should be self-centering.Sean


On March 22, 2016 9:03:59 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi All,When I built my hatch system, I built it so the hinge pin has moment in it so the o-ring would have full contact before the hatch was fully closed metal to metal.When I vacuum test it, the hatch is not perfectly even in the seat, or at least it seems like it.  I am wondering if I should close the hatch with the o-ring out and the hatch perfectly positioned and then weld bushings to the hinge so the pin has no movement.   Or should I leave it alone and expect that the external pressure will push the hatch into place?  Hank
Scott, did you notice if your hatch hinge has play?
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