[PSUBS-MAILIST] electro plating

Thu Dec 31 05:01:02 EST 2015

Hi Brian,

Hank has already said it but the epdm doesn't seem so good.  I went with it
because that's what it said in the Stachiw book.  I tested my dome to 60
meters (200 feet) and although I couldn't see it, the rubber had obviously
extruded quite a lot due to the amount of silicone squeezed out.  Also, on
my forward main tank, I have "windows" that are mounted on epdm seats.
They are not pressure windows, just covers but they still need to seal the
main tank.  When I tighten the 8 bolts, the epdm extrudes maybe up to 5mm
in places and I have to go around and trim it off.  And they leaked before
I sealed them permanently with sikaflex.

Hank tested the neoprene\cork blend I sent him and it tested out much
better.  Im changing my dome mount to have that instead.

Perhaps if you used a harder EPDM it might be ok?  The one I have is 70
shore.

I think a lot of people just sit the acrylic straight on the seat as well.
I would probably just do that now with my dome, but I cannot as the
retaining ring seal is designed for the 1mm gasket underneath.  I am
changing the seat for 1mm neoprene\cork gasket in a few weeks time.

Kind Regards
James

On 31 December 2015 at 02:27, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I think you're the only one who uses cork,  Stachiw shows "rubber"  and
> I've seen many subs with rubber products,  I'll just have to find a gnarly
> glue, I think silicone might work.    How do you know how to do
> electroplating?   don't you have to dip the whole thing into a solution and
> then run a current through it?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] electro plating
> Date: Wed, 30 Dec 2015 22:43:28 +0000 (UTC)
>
> Brian,
> I tested EPDM in my port test chamber with contact cement and it extruded,
> rubber extrudes man.  Gamma has cork
> Hank
>
>
> On Wednesday, December 30, 2015 3:29 PM, Brian Cox via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Oh, pg 237 :  To minimize lateral extrusion under compression they should
> be securely bonded with contact cement to the bearing support seat in the
> flange.
>
> Brian Cox
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org
> >
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] electro plating
> Date: Wed, 30 Dec 2015 14:23:28 -0800
>
> Hank,
>              I don't remember anything in the Stachiw book about an
> extruding problem, I'll have to check again.   They designate various
> gasket material and thickness, and they call for neoprene, and some others,
> I'm using EPDM.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] electro plating
> Date: Wed, 30 Dec 2015 21:51:36 +0000 (UTC)
>
> Hi Brian,
> Yes I could overlay weld ss, but that is a ton of work compared to
> electroplating.
> Yes your Gasket will extrude if you use rubber.  I just did some
> compression testing for a Psub member with cork he supplied.  The cork
> compresses .03 inch  and stays compressed and does not extrude.   I tested
> the cork material to 1,555 psi.
> Hank
>
>
> On Wednesday, December 30, 2015 11:52 AM, Brian Cox via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> You could lay some stainless weld over the entire area and then machine it
> flat.
>
> Brian Cox
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] electro plating
> Date: Wed, 30 Dec 2015 13:45:03 +0000 (UTC)
>
> Hi All,
> Has anyone looked at electro plating a hatch and land mating surface.
> That is my plan, first copper, then nickel.   I can do it myself at home.
> Hank
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