[PSUBS-MAILIST] Gamma hatch

Tue Dec 2 16:47:47 EST 2014

Does anyone know if a durometer of 70 would suffice for a hatch o 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: Mon, 1 Dec 2014 13:18:17 -0800

Brian,
I know that piece is pricy, yikes, that is why I use 516-70 then laminate 1/16 ss to that.  I am to cheap to buy the ss ring. :-) Yes the ss tube is for my cue ball arm.
Hank
--------------------------------------------
On Mon, 12/1/14, 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: Monday, December 1, 2014, 2:23 PM

 The stainless seems to do all kinds
 of crazy stuff when welded, Hopefully there's enough meat on
 there to deal with any warp-age, clamping or tacking to a
 flat piece of plate may also be an option.  I'll have
 to take it to a shop that has a big enough lathe to handle
 it, I've already talked to them about it. That ring was
 quite costly !

 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: Mon, 1 Dec 2014 05:04:04 -0800

 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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