[PSUBS-MAILIST] Gamma hatch

Sun Nov 30 13:54:42 EST 2014

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
 > 
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