[PSUBS-MAILIST] annealing windows

[Alec Smyth via Personal_Submersibles]

Phew! I'll ask Greg Cottrell that question, I can't think why the placebo
window would melt and not the others. Years ago I recall him saying he had
had to experiment quite a lot with fans inside the oven until he got
temperatures even. Maybe its just one part of the oven getting hotter than
the rest of it.

Best,

Alec

On Sat, Nov 21, 2015 at 11:27 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,   yes, correct, the window with the hole for the probe is just to
> monitor the temp.  I wonder if any of those psubers across the pond would
> have any experience with something like this.
>
> Brian C.
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] annealing windows
> Date: Sat, 21 Nov 2015 23:00:28 -0500
>
> 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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