[PSUBS-MAILIST] Distortion when cutting in shell

[hank pronk via Personal_Submersibles]

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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