[PSUBS-MAILIST] dome mount

[hank pronk via Personal_Submersibles]

Emile,
I am pulling pretty hard on the straps because the dome is 150 lbs on its own.  Also I am relying on the EPDM to seal at the surface.  I could have put more bolts in the AL ring also but this way I don't have to worry about pulling the treads out of the AL.  I used the AL you suggested when I asked James.  
Hank--------------------------------------------
On Wed, 4/22/15, Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] dome mount
 To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
 Received: Wednesday, April 22, 2015, 9:26 AM
 
 Which Alu? Yield varies
 from 100 to 450 N/mm2
 AW 5083 or Anodised
 AW6082 is the best for domerings in my opinion.
 
 Emile
 
 -----Oorspronkelijk bericht-----
 Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
 Namens hank pronk via Personal_Submersibles
 Verzonden: woensdag 22 april 2015 13:50
 Aan: personal_submersibles at psubs.org
 Onderwerp: [PSUBS-MAILIST] dome mount
 
 I had a design problem with my
 AL dome seat.  I had the strap assembly
 bolted to the AL seat only, and that was a
 mistake.  After installing the
 dome
 assembly on the sub I double checked the fit and found that
 when I
 tighten the straps the Al seat was
 distorting.  I am not very experienced
 working with large AL material and did not
 realize how Whimpy it is.  I
 corrected this
 by drilling through the AL and into the 2in thick
 reinforcing
 ring and installing studs.  Now
 the strap assembly pulls from the steel
 ring.  I simply tighten the strap assembly
 until I see an even impression in
 the EPDM
 gasket.  I am now reassembling Gamma, I am excited to get
 back in
 the water and try out my dome.
 Hank
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