[PSUBS-MAILIST] dome mount

Thu Apr 23 08:01:14 EDT 2015

Hi James,
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.
Hank--------------------------------------------
On Thu, 4/23/15, James Frankland 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: Thursday, April 23, 2015, 4:51 AM

 Hi
 Hank,How was the alu ring attached to the 2"
 reinforcing ring before you added the studs?  I think its
 time for some picture updates on your page...
 :) Kind
 RegardsJames
 On 22 April 2015 at 18:07,
 hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

 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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