[PSUBS-MAILIST] Distortion when cutting in shell

[André Eriksen via Personal_Submersibles]

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 / Regards
*André Eriksen*
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