[PSUBS-MAILIST] Gamma hatch

[Brian Cox via Personal_Submersibles]

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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