[PSUBS-MAILIST] Clearances

[Daniel Lance via Personal_Submersibles]

Rick,
Sean's suggestion of finding a machine shop that can do the in-situ
machining to enlarge your viewport frame would probably produce the least
amount of hassle. That's assuming there will be enough metal left on the
perimeter flange after the machining process.
If you have access to Jerry Stachiw's book "Handbook of Acrylics" it would
certainly be worth the read . It goes into great detail outlining the
recommended procedures for fabricating, machining and then annealing. A
second annealing isn't out of the question ...it just must be done at
carefully controlled lower temperatures.
If you decide to go with reducing the diameter of the acrylic viewport ,
one possible company that might be able to help you is "
www.hydrospacegroup.com" . If not they might be able to recommend someone
that can ?
Dan

On Mon, Dec 9, 2024 at 10:18 PM Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>
> Sent from my iPhone
> I got a real surprise yesterday, I went to fit my large viewport in front
> on my K-350 and it wouldn’t slide inside the receiver that I had machined
> for it. They made it about 1/4” too small!
> I should have double checked it before welding it into the front head but
> didn’t.
> I had the viewports cut in California and is to speck, 15”.  Kitteredge
> called out using gasket but a lot of you I believe used Silaflex that comes
> out of a tube.
> I found someone who can chuck up something that is 16” in diameter so will
> have him turn it down 1/4” or so, so it will fit in the receptacle but I
> need enough of a gap on the edges for the Sikaflex to ooze out.
> Your thoughts?
> Rick
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