[PSUBS-MAILIST] conical hatch seat troubles

[MerlinSub@t-online.de via Personal_Submersibles]

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 troubles
Datum: 2016-12-01T12:00:56+0100
Von: "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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