[PSUBS-MAILIST] Gamma hatch

Mon Dec 1 08:04:04 EST 2014

Brian,
I have to agree about feeling better with the ring in the middle.  At the same time, I feel better if the CT is also in the middle and the hatch dome is in the middle.  This way all the force from the hatch is in a strait line down to the hull.  When I welded my K350  ring (not ss) it warped just under 1/8in.  I have to assume the designer allowed for that and started with a heavier ring than required.  I never use a ss ring, so can't say how it will react.  I would assume it will warp at least 1/8 inch maybe more.  Your starting with 1/2 inch material, what will you end up with?  Will it be enough?  I would consider making a steel ring, then bolt the ss ring to it.  I am assuming the ss ring is simply for corrosion resistance.  I would run that idea by an engineer of coarse.  
Maybe your welders have a technique to reduce warp age.
Do you have a lathe big enough to machine this?
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, 11:32 PM

 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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