<div dir="ltr"><div>Hi Hank,</div><div>You could have made a hatch arrangement so you could remove the dome from inside. Mine is like that and I think Emile's as well. I like the idea of having 2 ways out! But then you have security against overpressure. "Swings and Roundabouts" as they say.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 23 April 2015 at 13:01, hank pronk via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi James,<br>
The Alu ring is bolted to the steel ring with 8, 3/8 fine thread bolts. More bolts may have prevented the distortion. The studs cured the problem perfectly. Also the dome is secured better in the case of an over pressure. I will change the studs to grade 8.<br>
Hank--------------------------------------------<br>
<span>On Thu, 4/23/15, James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
Subject: Re: [PSUBS-MAILIST] dome mount<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
</span> Received: Thursday, April 23, 2015, 4:51 AM<br>
<br>
Hi<br>
Hank,How was the alu ring attached to the 2"<br>
<div><div class="h5"> reinforcing ring before you added the studs? I think its<br>
time for some picture updates on your page...<br>
:) Kind<br>
RegardsJames<br>
On 22 April 2015 at 18:07,<br>
hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
<br>
Emile,<br>
<br>
I am pulling pretty hard on the straps because the dome is<br>
150 lbs on its own. Also I am relying on the EPDM to seal<br>
at the surface. I could have put more bolts in the AL ring<br>
also but this way I don't have to worry about pulling<br>
the treads out of the AL. I used the AL you suggested when<br>
I asked James.<br>
<br>
Hank--------------------------------------------<br>
<br>
On Wed, 4/22/15, Emile van Essen via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
<br>
<br>
<br>
Subject: Re: [PSUBS-MAILIST] dome mount<br>
<br>
To: "'Personal Submersibles General<br>
Discussion'" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
<br>
Received: Wednesday, April 22, 2015, 9:26 AM<br>
<br>
<br>
<br>
Which Alu? Yield varies<br>
<br>
from 100 to 450 N/mm2<br>
<br>
AW 5083 or Anodised<br>
<br>
AW6082 is the best for domerings in my opinion.<br>
<br>
<br>
<br>
Emile<br>
<br>
<br>
<br>
-----Oorspronkelijk bericht-----<br>
<br>
Van: Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>]<br>
<br>
Namens hank pronk via Personal_Submersibles<br>
<br>
Verzonden: woensdag 22 april 2015 13:50<br>
<br>
Aan: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
<br>
Onderwerp: [PSUBS-MAILIST] dome mount<br>
<br>
<br>
<br>
I had a design problem with my<br>
<br>
AL dome seat. I had the strap assembly<br>
<br>
bolted to the AL seat only, and that was a<br>
<br>
mistake. After installing the<br>
<br>
dome<br>
<br>
assembly on the sub I double checked the fit and found<br>
that<br>
<br>
when I<br>
<br>
tighten the straps the Al seat was<br>
<br>
distorting. I am not very experienced<br>
<br>
working with large AL material and did not<br>
<br>
realize how Whimpy it is. I<br>
<br>
corrected this<br>
<br>
by drilling through the AL and into the 2in thick<br>
<br>
reinforcing<br>
<br>
ring and installing studs. Now<br>
<br>
the strap assembly pulls from the steel<br>
<br>
ring. I simply tighten the strap assembly<br>
<br>
until I see an even impression in<br>
<br>
the EPDM<br>
<br>
gasket. I am now reassembling Gamma, I am excited to<br>
get<br>
<br>
back in<br>
<br>
the water and try out my dome.<br>
<br>
Hank<br>
<br>
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