[PSUBS-MAILIST] dome mount

[James Frankland via Personal_Submersibles]

Hi Hank,
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.

On 23 April 2015 at 13:01, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>
> 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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