[PSUBS-MAILIST] annealing windows

Sun Nov 22 11:27:45 EST 2015

What annealing schedule are you following? (Looking at pages 845 - 849 of Jerry Stachiw's book).

Sean

On November 22, 2015 7:04:02 AM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Alec,   That's what I was thinking, but the oven has a very even
>temperature.  Earlier, when I was experimenting I had 6 or 7 digital
>temp gages placed at various places in the oven and the temp did not
>vary all that much, maybe 15 degrees from the top to the bottom.  It's
>just a standard oven I got from a junk yard, but I pulled everything
>out of it and am running small electric coil with a vary-ac .  I'm
>thinking that once the acrylic goes through multiple cycles it starts
>to degrade from the high heat.
>
> 
>
>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: Sun, 22 Nov 2015 06:23:39 -0500
>
>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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