[PSUBS-MAILIST] hatch pin

Wed Mar 23 15:33:57 EDT 2016

James,  

I would be betting a penny to a pound that it is the contraction of the metal when you welded it and it will be pulling a bit.  Easiest way to check is to take the pins out of the hinges and put the hatch in the closed position and see what the pin alignment looks like.  You may be able to clamp in place and then put a reamer through and an oversize pin.  Probably by this time you will have checked all that anyway.  Regards,  Hugh  

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of James Frankland via Personal_Submersibles
Sent: Wednesday, 23 March 2016 5:21 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] hatch pin

Hank.

I did exactly that.  Locked the hatch shut dead tight and welded the hinges and brackets etc on with no leeway in the pin.  When it was done, the hatch didn't close properly.  I don't know why.  I filed about 1mm off the hinge holes and then it closed.  I don't seem to notice any play with the springs on and the hatch doesn't leak.

Regards

James

On 22 March 2016 at 15:03, 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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