[PSUBS-MAILIST] Distortion when cutting in shell

[hank pronk via Personal_Submersibles]

Andre,
It is my experience that the  shell wants to unroll so to speak.  This is not always true, I would play it safe and put two rings in.  You will know if it was a good idea when you have the piece cut out, if the piece is flatter that means it went out of shape.  Place the piece back in the hole and I bet the curve will be less.
Hank--------------------------------------------
On Sun, 5/10/15, 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: Sunday, May 10, 2015, 2:40 PM
 
 I`m
 using plasma.
 Was
 thinking if there were any stress in the shell after the
 rolling, it would tend to distort due to weakening after
 cutting out the hole.
 RegardsAndré
 2015-05-10 16:50 GMT+02:00
 Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org>:
 
 
 
 
 
 Hi André
  
 Not such a issue wit a plasma cutter.
 
 The full penetration welds will cause
 more 
 distortion.
 Temporery reinforfment
 okay.
  
 Emile
 
 
 
 Van:
 Personal_Submersibles 
 [mailto:personal_submersibles-bounces at psubs.org]
 Namens André Eriksen via 
 Personal_Submersibles
 Verzonden:
 vrijdag 8 mei 2015 
 23:10
 Aan: Personal Submersibles
 General 
 Discussion
 Onderwerp: [PSUBS-MAILIST]
 Distortion when cutting in 
 shell
 
 
 
 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.
 
 
 
 
 Thanks
 André
 
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 -- 
 Med
 Vennlig Hilsen / RegardsAndré
 Eriksen
 
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