[PSUBS-MAILIST] Distortion when cutting in shell

[hank pronk via Personal_Submersibles]

Andre,
I don't know what type of ring you are using, I assume a T ring.  I would think if the T ring is under load it could tip and loose shape.  That is why I suggested to tack them in place.  I can see that is a problem for you.  You idea sounds good to me, maybe four good tacks in spots that are easy to grind off. 
Hank--------------------------------------------
On Sat, 5/9/15, André Eriksen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Distortion when cutting in shell
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Saturday, May 9, 2015, 9:55 AM
 
 Thanks for
 the input guys.Mine is a cylinder. 
 
 Problem
 is the rings are placed similar like the k-boats. If I place
 them at the excact place I would cut into them. And I can`t
 finish the weld on the tower-insert with the rings in
 place.So maybe I can tack them in a little bit
 offset, cut the hole, tack in the tower-insert, remove the
 rings, finish welding the tower insert, then weld in the
 rings.Does this sound like a good
 procedure?
 Thanks,André
 2015-05-09 3:49 GMT+02:00
 hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>:
 
 
 Andre
 
 I would defiantly place the two rings in and I would put
 them exactly where they go and tack them.  There is a good
 chance that the opening will create a weak spot so to speak
 and the shell will bend up at the center of the hole. 
 Brian is right if it is a sphere, no worries.  The cylinder
 can go egg shape.
 
 Hank --------------------------------------------
 
 On Fri, 5/8/15, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 
 
 
  Subject: Re: [PSUBS-MAILIST] Distortion when cutting in
 shell
 
  To: "Personal
 Submersibles General Discussion" <personal_submersibles at psubs.org>
 
  Received: Friday, May 8, 2015, 7:05 PM
 
 
 
  That's 1/2"  if
 
  it's A516 70 grade it should be no problem, 
 
   My Sphere thickness is 3/8" and
 
  I could not detect any distortion.
 
   Brian
 
 
 
  --- personal_submersibles at psubs.org
 wrote:
 
 
 
  From: André Eriksen via
 
  Personal_Submersibles
 
  <personal_submersibles at psubs.org>
 
  To:
 
  Personal Submersibles General Discussion
 
  <personal_submersibles at psubs.org>
 
  Subject: [PSUBS-MAILIST] Distortion when
 
  cutting in shell
 
  Date: Fri, 8 May 2015
 
  23:10:03 +0200
 
 
 
  Hi all,
 
  When you cut out the hole for the
 
  conningtower, is distortion of the shell an
 
  issue?
 
  My shell is
 
  12mm in thickness. Wondering if I should place a
 
  reinforcement ring on either side of the hole to be cut
 -Not
 
  welding them so I can remove them after I have tacked
 the
 
  tower in place.
 
 
 
 
 
  ThanksAndré
 
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 -- 
 Med
 Vennlig Hilsen / RegardsAndré
 Eriksen
 
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