[PSUBS-MAILIST] Clearances

[Daniel Lance via Personal_Submersibles]

Rick,
After you get your acrylic viewport lense machined down to the proper
diameter , it's very important to have it put in a temperature controlled
oven and anneal the stresses induced during the machining process.
Preferably by someone experienced in doing this type of work. ( not in your
kitchen oven )
Dan

On Mon, Dec 9, 2024, 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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