[PSUBS-MAILIST] Gamma hatch

Sun Nov 30 23:32:07 EST 2014

Hank,
       I'm sort of leaning back towards putting everything in the middle again.  For some reason the wider the hatch ring the better it makes me feel, not sure why that is, maybe just more surface area to be in contact.  Theoretically if your two mating pieces are perfectly flat you wouldn't even need an o ring !  Also, my welder wants me to put it in the middle.

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 17:51:28 -0800

Brian,
If the hatch dome ends in the center it would.  Did you notice how narrow the land is on Gamma, it is like 3/4 inch.  The hatch ring is the same, I was surprised to see that.
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, 6:09 PM

 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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