[PSUBS-MAILIST] Hatch/Hatch Ring Flatness Evaluation

[hank pronk via Personal_Submersibles]

Hi Steve,
Been there, you can use feeler gauges to identify the high spots.  Depending how much it is, I think your best to leave it alone.  I have deep tested with .002in distortion with no issues.
Hank--------------------------------------------
On Sat, 4/26/14, Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] Hatch/Hatch Ring Flatness Evaluation
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Saturday, April 26, 2014, 5:08 PM
 
 All, I am
 evaluating my K-250 hard hatch/tower ring mating. This hard
 hatch was custom made for this K-250 by the previous
 owner.  
 
 When the hatch is closed (w/o-ring removed) and the interior
 of the sub is brightly lit I notice I can see light between
 the hatch and hatch ring in places. The "gaps" are
 not huge and I believe with the o-ring installed no light
 would be seen.
 
 
 However I believe it tells me there are some flatness
 issues in this interface. In a perfect world I should see no
 light.
 
 My questions are, what is a precise way to
 identify the "high points" and is grinding the
 hatch surface vs. the tower ring the right surface to
 modify?
 
 
 Steve
  
 
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