[PSUBS-MAILIST] conical hatch seat troubles

[hank pronk via Personal_Submersibles]

Carsten,I can turn it but it is very heavy and wants to wobble in the seat or climb out because it is conical.  It is a solution though!   Is it necessary though?Hank 

    On Thursday, December 1, 2016 4:56 AM, "MerlinSub at t-online.de via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
 

  Hank can you turn the hatch in the seat ? 
 3 Peace of sandpater all 120 degree and turning and water dripping from a hose or later Piston Paste between hatch and seat ? Making a leaver on the hatch and running the hole day around the submarine?30 Turns clockwise and 30 turns anticclock. Than again. Do you have friends liking hard walking? Its a good evening with two friends and some sixpacks of beer It was exact that way Emile and I making the final seat of a dome seat.  vbr Carsten     -----Original-Nachricht-----Betreff: [PSUBS-MAILIST] conical hatch seat troublesDatum: 2016-12-01T12:00:56+0100Von: "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org>An: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>   Hi All,I have a problem with my conical  hatch seat.  I have discovered that I have a .005 in gap between the hatch and seat in two spots.  It seems the seat is oval with a gap at each end.  I have no way of measuring this other than placing video cassette tape ribbon strips between the hatch and seat.  What I do is, I cut the ribbon into 3 inch strips, then tape them in place so they are hanging over the seat.  I put one every two inches, then close the hatch.  The ribbons are then trapped tight in the gap.  if the ribbons can pull out then there is a gap.  Sure enough, I can remove one at the front, so I put two ribbons on top of each other in that spot and it still pulls out.  I add another making 3 ribbons thick and it is tight.  Then I tried doubling one ribbon in the front and one opposite in the back and they were tight.  The conclusion is that the seat is oval by .005 in at each end.  I put the hatch back in the lathe and re-faced it, to be sure it is not the hatch.  It is the seat, it seems my flange facing machine is not perfect-not a big surprise.  This is still very good for a portable home made tool.I don't know if this a problem or not, how accurate does this have to be?  Will the assembly simply bend?  My feeling is the hatch and seat will deform to match under pressure.  To put it into perspective, I just measured a hair and that is .01 in. the same as the total gap combined.Hank
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