[PSUBS-MAILIST] annealing windows

[Alec Smyth via Personal_Submersibles]

Brian, just to make sure I understand... I presume the window with the hole
was a "placebo" you threw in the oven along with the actual windows, to
monitor temperature rise? Else, if you drilled a partial hole into one of
the actual windows unfortunately my reaction would be a very big UH-OH!!!
That would be a stress concentrator in a spot where you *really* do not
want one.


Best,

Alec



On Sat, Nov 21, 2015 at 10:32 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Had a weird observation while annealing my windows,  I have one window
> that I drilled a 1/8' deep hole for a temperature probe so I can monitor
> the rise of the acrylic.  After the annealing, the one window with the
> probe, it's surface was badly melted.   The rest of the windows were
> perfectly fine.  The only difference was that the window with the probe has
> gone through multiple annealing cycles. It was also sitting on another
> piece of thick acrylic, but I don't think that would have anything to do
> with it's surface being melted.
>
> Brian Cox
>
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