<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Alan,</DIV><DIV> The outfit that I go through were out of the 80 durometer ( 19" in dia), but they had the 70.</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR>Date: Wed, 3 Dec 2014 01:19:46 +0000 (UTC)<BR><BR></DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><DIV dir="ltr"><SPAN>Brian,</SPAN></DIV><DIV dir="ltr"><SPAN>the "Deep Worker" uses 80 duromer.</SPAN></DIV><DIV dir="ltr"><SPAN>Here is the Parker o-ring selector pdf link.</SPAN></DIV><DIV dir="ltr"><SPAN><A href="http://www.parker.com/literature/ORD%205700%20Parker_O-Ring_Handbook.pdf">www.parker.com/literature/ORD%205700%20Parker_O-Ring_Handbook.pdf</A><BR></SPAN></DIV><DIV dir="ltr">Alan</DIV><BR> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <DIV dir="ltr"> <HR size="1"> <FONT face="Arial" size="2"> <B><SPAN style="font-weight: bold;">From:</SPAN></B> Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><BR> <B><SPAN style="font-weight: bold;">To:</SPAN></B> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <BR> <B><SPAN style="font-weight: bold;">Sent:</SPAN></B> Wednesday, December 3, 2014 10:47 AM<BR> <B><SPAN style="font-weight: bold;">Subject:</SPAN></B> Re: [PSUBS-MAILIST] Gamma hatch<BR> </FONT> </DIV> <DIV><BR>Does anyone know if a durometer of 70 would suffice for a hatch o ring?<BR><BR>Brian <BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR>Date: Mon, 1 Dec 2014 13:18:17 -0800<BR><BR>Brian,<BR>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.<BR>Hank<BR>--------------------------------------------<BR>On Mon, 12/1/14, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> To: "Personal Submersibles General Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Received: Monday, December 1, 2014, 2:23 PM<BR> <BR> The stainless seems to do all kinds<BR> of crazy stuff when welded, Hopefully there's enough meat on<BR> there to deal with any warp-age, clamping or tacking to a<BR> flat piece of plate may also be an option. I'll have<BR> to take it to a shop that has a big enough lathe to handle<BR> it, I've already talked to them about it. That ring was<BR> quite costly !<BR> <BR> Brian<BR> <BR> <BR> <BR> --- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A><BR> wrote:-<BR> <BR> From: hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> Date: Mon, 1 Dec 2014 05:04:04 -0800<BR> <BR> Brian,<BR> I have to agree about feeling better with the ring in the<BR> middle. At the same time, I feel better if the CT is<BR> also in the middle and the hatch dome is in the<BR> middle. This way all the force from the hatch is in a<BR> strait line down to the hull. When I welded my<BR> K350 ring (not ss) it warped just under 1/8in. I<BR> have to assume the designer allowed for that and started<BR> with a heavier ring than required. I never use a ss<BR> ring, so can't say how it will react. I would assume<BR> it will warp at least 1/8 inch maybe more. Your<BR> starting with 1/2 inch material, what will you end up<BR> with? Will it be enough? I would consider making<BR> a steel ring, then bolt the ss ring to it. I am<BR> assuming the ss ring is simply for corrosion<BR> resistance. I would run that idea by an engineer of<BR> coarse. <BR> Maybe your welders have a technique to reduce warp age.<BR> Do you have a lathe big enough to machine this?<BR> Hank <BR> --------------------------------------------<BR> On Sun, 11/30/14, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> wrote:<BR> <BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> To: "Personal Submersibles General Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Received: Sunday, November 30, 2014, 11:32 PM<BR> <BR> Hank,<BR> I'm sort of leaning back<BR> towards putting everything in the middle again. For<BR> some reason the wider the hatch ring the better it makes<BR> me<BR> feel, not sure why that is, maybe just more surface area<BR> to<BR> be in contact. Theoretically if your two mating pieces<BR> are perfectly flat you wouldn't even need an o ring ! <BR> Also, my welder wants me to put it in the middle.<BR> <BR> Brian<BR> <BR> --- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A><BR> wrote:<BR> <BR> From: hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> Date: Sun, 30 Nov 2014 17:51:28 -0800<BR> <BR> <BR> Brian,<BR> If the hatch dome ends in the center it would. Did you<BR> notice how narrow the land is on Gamma, it is like 3/4<BR> inch. The hatch ring is the same, I was surprised to<BR> see that.<BR> Hank--------------------------------------------<BR> On Sun, 11/30/14, Brian Cox via Personal_Submersibles<BR> <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> wrote:<BR> <BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> To: "Personal Submersibles General Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Received: Sunday, November 30, 2014, 6:09 PM<BR> <BR> Seems like if you had the welds in<BR> the center the pressure would be distributed evenly<BR> across<BR> the 1 1/2" land and hatch ring.<BR> <BR> Brian<BR> <BR> --- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A><BR> wrote:<BR> <BR> From: hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> Date: Sun, 30 Nov 2014 10:55:45 -0800<BR> <BR> <BR> And that point is generally at the outer edge of the<BR> land.<BR> Hank--------------------------------------------<BR> On Sun, 11/30/14, hank pronk via<BR> Personal_Submersibles<BR> <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> wrote:<BR> <BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> To: "Personal Submersibles General Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Received: Sunday, November 30, 2014, 1:54 PM<BR> <BR> You would think the weld<BR> point should be directly below the weld point where<BR> the<BR> hatch dome meets the ring. This would transfer the<BR> load<BR> straight down.<BR> Hank<BR> --------------------------------------------<BR> On Sun, 11/30/14, Brian Cox via<BR> Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> wrote:<BR> <BR> Subject: Re:<BR> [PSUBS-MAILIST] Gamma hatch<BR> To:<BR> "Personal Submersibles General Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Received: Sunday, November 30, 2014, 1:51<BR> PM<BR> <BR> Good information Alec,<BR> thanks ! <BR> I'll have it turned<BR> afterward of course but no need to take<BR> off<BR> more metal than necessary.<BR> <BR> Brian <BR> <BR> ---<BR> <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A><BR> wrote:<BR> <BR> <BR> From: Private via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> To: Personal Submersibles General Discussion<BR> <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> Date: Sun, 30 Nov 2014 13:30:18 -0500<BR> <BR> Careful! If you weld a ring<BR> on the way you describe with the<BR> weld in<BR> the middle, the weld shrinkage on either side of the<BR> head wall can bend the SS, leaving you with a<BR> curved SS<BR> ring. I can tell you from painful<BR> experience the amount of<BR> deflection can be<BR> amazing, we're not talking a few<BR> <BR> hundredths... In my case it was about a quarter<BR> inch.<BR> I'd<BR> recommend cutting the head so it<BR> meets the ring at the<BR> outside corner.<BR> <BR> Best,<BR> <BR> Alec<BR> <BR> <BR> <BR> > On Nov 30, 2014, at<BR> 11:36 AM, Brian Cox via<BR> <BR> Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> wrote:<BR> > <BR> <BR> > Hank,<BR> > I think I'm<BR> going to have a shop<BR> down the road turn<BR> that elliptical head so that the edge<BR> comes<BR> right in the middle of the bottom of the ring, still<BR> need to talk to the welder to see what kind of<BR> edge he<BR> wants. With the hatch I'm<BR> thinking of welding a large<BR> pipe segment on<BR> there because there's nothing to grab onto<BR> for the lathe.<BR> > <BR> > Brian <BR> > <BR> > --- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A><BR> wrote:<BR> > <BR> <BR> > From: hank pronk via Personal_Submersibles<BR> <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > To: Personal Submersibles General<BR> Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > Subject: Re: [PSUBS-MAILIST] Gamma<BR> hatch<BR> > Date: Sun, 30 Nov 2014 07:57:38<BR> -0800<BR> > <BR> > Brian,<BR> > I will look forward to a picture of your<BR> CT and<BR> hatch. In particular I would like<BR> to see how you<BR> transition from the<BR> elliptical portion to the 1 1/2in wide<BR> <BR> ring.<BR> > Hank<BR> ><BR> --------------------------------------------<BR> > On Sun, 11/30/14, Brian Cox via<BR> Personal_Submersibles<BR> <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> wrote:<BR> > <BR> <BR> > Subject: Re: [PSUBS-MAILIST] Gamma hatch<BR> > To: "Personal Submersibles General<BR> Discussion" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > Received: Sunday, November 30, 2014,<BR> 10:44 AM<BR> > <BR> > Hi<BR> Hank,<BR> > I bought two<BR> > stainless rings 1/2" thick by 1<BR> 1/2" wide (18" id).<BR> Which<BR> > will be welded on to the conning tower<BR> and the hatch,<BR> then a<BR> ><BR> o ring groove put in the hatch side. With the<BR> drop I<BR> > was able to get<BR> 6 - 6" disks which I'm going to<BR> <BR> make<BR> > into electrical inserts that will<BR> go into two of my<BR> > viewports. <BR> > Conning tower getting welded today (<BR> 8<BR> viewports) and<BR> > also<BR> working on the other viewports on the sphere, got<BR> two<BR> > welder friends that<BR> I have working on them, both 30+<BR> years<BR> > of commercial welding experience !<BR> > <BR> > Brian <BR> > <BR> > --- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A><BR> > wrote:<BR> > <BR> > From: hank pronk via<BR> Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > To: Personal Submersibles General<BR> Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > Subject: Re: [PSUBS-MAILIST] Gamma<BR> hatch<BR> > Date: Sun, 30 Nov 2014 05:39:19<BR> -0800<BR> > <BR> > Brian,<BR> > What did you do for the hatch seat on the<BR> conning<BR> > tower. Is it stainless or<BR> did you do like Gamma<BR> has, a<BR> > layer of stainless welded on. <BR> > Hank <BR> ><BR> --------------------------------------------<BR> > On Sat, 11/29/14, Brian Cox via<BR> Personal_Submersibles<BR> <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > wrote:<BR> > <BR> > Subject: [PSUBS-MAILIST] Gamma hatch<BR> > To: "PSubs" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> > Received: Saturday, November 29, 2014,<BR> 8:30 PM<BR> > <BR> > <BR> Hank, <BR> <BR> <BR> > Do you know how big the shaft is that goes<BR> through the top<BR> > of<BR> your hatch? Have you every had to<BR> <BR> disassemble it<BR> > ? My hatch is<BR> pretty much identical to<BR> Gamma's,<BR> > I'm in the process of cutting in a<BR> little<BR> viewport in<BR> > <BR> and also that rotating hatch closure shaft /<BR> thru hull<BR> > <BR> deal. Seems like at least a 3/4"<BR> <BR> shaft<BR> > would be in<BR> <BR> > order. 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