[PSUBS-MAILIST] Gamma hatch

[John Kammerer via Personal_Submersibles]

Brian:

I am using 70 durometer by 1/4" O-ring material. 80 might be to hard to compress properly. 

John K.
(203) 414-1000

Sent from my iPhone

> On Dec 2, 2014, at 4:47 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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