Re: Visibility / Safety or Safety / Visibility ?

[protek@shreve.net]

This thing on windows;  You need to cut a piece of acrylic larger than what
you need by maybe 15% in diameter.  Then shrink cycle it first before you
machine it.  Then machine it and then anneal it.  Two heat treating cycles
are required. "Acrylic Plastic Viewports" J. Stachiw...

GB


At 08:33 PM 2/23/99 -0500, you wrote:
>> I'd like hear about where viewports can be purchased for a 200-foot
>> depth.
>>
>> Michael B. Holt
>> Oregon Hill, Richmond, Virginia, U.S.A.
>>
>
>  Hi Mike
>As far as buying view ports I don't know where you can get them. I sent for
>the report PVHO from ASME to learn how to properly make the lenses. Then I
>made my own from 1.25 in thick cast acrylic sheet and cut it up on a saw
>into octagon shapes. Then I turned them down round on my lathe. I have the
>tapered seat design. I could make some more ASME approved design lenses, but
>because I am not a ASME certified builder , the lenses would not be
>technically ASME approved. Do you see what I'm saying?
>
>If some one used this report, did there own design work, and sent me the
>material and a drawing, I could do the machining.
>That way you are responsible for whatever happens not me, you would also
>have to make a test rig and test your own lenses before installing them.
>That way I am just cutting a piece of plastic for you and I would not be the
>one saying it would be ok to use them as view ports. The maximum Dia. that I
>can turn in my lathe is about 10".
>
>
>Let me know, Jon Shawl
>Have you seen my sub? http://www.nwcis.com/submarine/
>
>
>
>