[PSUBS-MAILIST] Light housing gaskets

[Alec Smyth via Personal_Submersibles]

For under the lens I have no gasket. I think the main reason I was breaking
lenses on one light but not the other was that in the problem one the
cavity for the lens was ever too small and the lens was squeezed by it. The
problem seemed to be resolved by re-machining the cavity to enlarge it by
just a few thousandths. If that had not solved it, my next step was going
to be adding a gasket under the lens. It would need to be very thin, and I
was planning to cut it from disposable gloves. But apparently no need. As
the top gasket I use the O ring itself. I've chamfered the top edge of the
lens cavity and use a triangular sealing pattern for the o ring.

Best,

Alec


On Tue, Apr 18, 2017 at 10:28 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Cliff & Alec,
> just ordering 20 tempered borosilicate lenses at $2-50 each including
> postage!
> They will go in the pressure chamber, so I'll know whether I got good
> value.
> Just wondering what you guys used as gaskets under the lens.
> I did have an o-ring under the acrylic lens but are putting a gasket under
> the glass.
> I have an o-ring in the bore of the lens housing but would like my gasket
> to be a
> secondary seal as well as seat.
> Alec, with your experience of lenses breaking, I am looking at a suitable
> thickness
> of neoprene or similar for the top gasket that I can compress to half it's
> thickness
> when bolting the housing together. This will give me a bit of machining
> tolerance.
> see attachment
> Alan
>
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