<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Hi Rick,</div><div dir="ltr"><br></div><div dir="ltr">I agree with Dan. One could solve this either by enlarging the diameter of the seat or by decreasing the diameter of the acrylic. To me, it’s far easier to correct the acrylic than the seat. In addition, enlarging the seat diameter has the small effect of reducing your depth rating, whereas reducing the diameter of the window increases it. I second Dan’s suggestion of annealing too. That is called for after any machining of the acrylic. But both the machining operation and the annealing are relatively easy/quick jobs.</div><div dir="ltr"><br></div><div dir="ltr">Best,</div><div dir="ltr">Alec </div><div dir="ltr"><br><blockquote type="cite">On Dec 10, 2024, at 8:46 AM, Daniel Lance via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="auto">Rick,<div dir="auto">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 )</div><div dir="auto">Dan</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 9, 2024, 10:18 PM Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Sent from my iPhone<br>
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!<br>
I should have double checked it before welding it into the front head but didn’t. <br>
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.<br>
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. <br>
Your thoughts? <br>
Rick<br>
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