[PSUBS-MAILIST] Gamma hatch

Sun Nov 30 18:09:45 EST 2014

Seems like if you had the welds in the center the pressure would be distributed evenly across the 1 1/2" land and hatch ring.

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] Gamma hatch
Date: Sun, 30 Nov 2014 10:55:45 -0800

And that point is generally at the outer edge of the land.
Hank--------------------------------------------
On Sun, 11/30/14, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Gamma hatch
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Sunday, November 30, 2014, 1:54 PM

 You would think the weld
 point should be directly below the weld point where the
 hatch dome meets the ring.  This would transfer the load
 straight down.
 Hank
 --------------------------------------------
 On Sun, 11/30/14, Brian Cox via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] Gamma hatch
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Sunday, November 30, 2014, 1:51
 PM

  Good information Alec,
 thanks ! 
  I'll have it turned
 afterward of course but no need to take
  off
 more metal than necessary.

  Brian 

  ---
 personal_submersibles at psubs.org
  wrote:

 From: Private via Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal Submersibles General Discussion
 <personal_submersibles at psubs.org>
  Subject: Re: [PSUBS-MAILIST] Gamma hatch
  Date: Sun, 30 Nov 2014 13:30:18 -0500

  Careful! If you weld a ring
 on the way you describe with the
  weld in
 the middle, the weld shrinkage on either side of the
  head wall can bend the SS, leaving you with a
 curved SS
  ring. I can tell you from painful
 experience the amount of
  deflection can be
 amazing, we're not talking a few

 hundredths... In my case it was about a quarter inch.
 I'd
  recommend cutting the head so it
 meets the ring at the
  outside corner.

  Best,

  Alec

  > On Nov 30, 2014, at
 11:36 AM, Brian Cox via

 Personal_Submersibles <personal_submersibles at psubs.org>
  wrote:
  > 

 > Hank,
  >      I think I'm
 going to have a shop
  down the road turn
 that elliptical head so that the edge
  comes
 right in the middle of the bottom of the ring, still
  need to talk to the welder to see what kind of
 edge he
  wants.  With the hatch I'm
 thinking of welding a large
  pipe segment on
 there because there's nothing to grab onto
  for the lathe.
  > 
  > 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] Gamma
 hatch
  > Date: Sun, 30 Nov 2014 07:57:38
 -0800
  > 
  > Brian,
  > I will look forward to a picture of your
 CT and
  hatch.  In particular I would like
 to see how you
  transition from the
 elliptical portion to the 1 1/2in wide

 ring.
  > Hank
  >
 --------------------------------------------
  > On Sun, 11/30/14, Brian Cox via
 Personal_Submersibles
  <personal_submersibles at psubs.org>
  wrote:
  > 

 > Subject: Re: [PSUBS-MAILIST] Gamma hatch
  > To: "Personal Submersibles General
 Discussion" <personal_submersibles at psubs.org>
  > Received: Sunday, November 30, 2014,
 10:44 AM
  > 
  > Hi
 Hank,
  >            I bought two
  > stainless rings 1/2" thick by 1
 1/2" wide (18" id).
  Which
  > will be welded on to the conning tower
 and the hatch,
  then a
  >
 o ring groove put in the hatch side.  With the
  drop I
  > was able to get
 6  - 6" disks which I'm going to

 make
  > into electrical inserts that will
 go into two of my
  > viewports.  
  >   Conning tower getting welded today (
 8
  viewports) and
  > also
 working on the other viewports on the sphere, got
  two
  > welder friends that
 I have working on them, both 30+
  years
  > of commercial welding experience !
  > 
  > 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] Gamma
 hatch
  > Date: Sun, 30 Nov 2014 05:39:19
 -0800
  > 
  > Brian,
  > What did you do for the hatch seat on the
 conning
  > tower.  Is it stainless or
 did you do like Gamma
  has, a
  > layer of stainless welded on.  
  > Hank 
  >
 --------------------------------------------
  > On Sat, 11/29/14, Brian Cox via
 Personal_Submersibles
  <personal_submersibles at psubs.org>
  > wrote:
  > 
  >  Subject: [PSUBS-MAILIST] Gamma hatch
  >  To: "PSubs" <personal_submersibles at psubs.org>
  >  Received: Saturday, November 29, 2014,
 8:30 PM
  > 
  > 
 Hank,       

 >  Do you know how big the shaft is that goes
  through the top
  >  of
 your hatch?  Have you every had to

 disassemble it
  >  ?  My hatch is
 pretty much identical to
  Gamma's,
  >  I'm in the process of cutting in a
 little
  viewport in
  > 
 and also that rotating hatch closure shaft /
  thru  hull
  > 
 deal.   Seems like at least a 3/4"

 shaft
  >  would be in

 >  order. Brian
  > 

 >  -----Inline Attachment Follows-----

 > 
  > 
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