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Re: [PSUBS-MAILIST] Shrinkage of plexi windows.
There are some tables in Stachiw's book with recommendations. The
annealing time depends upon thickness, so the diameter really doesn't
matter except that you need a big enough oven. Annealing according to
the book requires strict temperature control in both directions, but I
think even Stachiw says in his book that any annealing is better than no
annealing, even if you can't get the precise temperature control or
hold-time at temperature required by the book.
Jon
ShellyDalg@aol.com wrote:
Hi Brian. Yes, there's two annealing processes required. At 3 inches
thick by 24 inch dia. for my main view port, it looks like it may take
up to 4 days for one annealing treatment. ( from a little preliminary
research done last winter )
I didn't find any set formula for shrinkage back then, but I didn't
spend a lot of time looking either.
My smaller windows are 2 inch thick and the disks are 16 inch dia.
I have a machinist locally that advertises he cuts/machines plexi and
said he does "heat treating" but I didn't get a good feeling about his
abilities. (still looking ) and I wanted some info to help determine
if the process is being done right. Frank D.
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