[PSUBS-MAILIST] Distortion when cutting in shell

Sat May 9 15:56:14 EDT 2015

Hank, yes the rings are T-shaped.

Brian, I haven`t designed any reinforcement pad. You mean like the Pilot
fish?
I can see that is a good way to strenghten the area. From my FEA analysis I
had to beef up the thickness quite a bit in the tower reinforcement.

Regards
André

2015-05-09 21:37 GMT+02:00 Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org>:

> Andre,
>              Do you have a reinforcement pad which would be integral to
> the hull surrounding the area next to where the nozzle (conning tower) will
> be ?
>
> Brian
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Distortion when cutting in shell
> Date: Sat, 9 May 2015 07:40:23 -0700
>
>
> 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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-- 
Med Vennlig Hilsen / Regards
*André Eriksen*
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