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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Te centre of the acrylic
will reach the same temp as the air. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Buto it will take some 2
hours for <st1:metricconverter ProductID="40 mm" w:st="on">40 mm</st1:metricconverter>
plate!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards, Emile<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Van:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b><span
style='font-weight:bold'>Namens </span></b>Sean T. Stevenson via Personal_Submersibles<br>
<b><span style='font-weight:bold'>Verzonden:</span></b> zondag 22 november 2015
17:23<br>
<b><span style='font-weight:bold'>Aan:</span></b> Personal Submersibles General
Discussion<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> Re: [PSUBS-MAILIST]
annealing windows</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Brian,
just wanted to make sure that the thermocouple in the acrylic sample is only
for monitoring the heat soak, and is not the one you are using to control the
oven temperature? Obviously, the centre of the acrylic is going to be cooler
than the oven air.<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>What is
the arrangement of heating elements? Are there fans to circulate the air in the
oven to homogenize it? If so, you might look at diffusing that airflow. You
only need enough to prevent temperature gradients in the oven. You might have a
hot spot across from a fan?<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Sean<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On November 21, 2015 9:27:47 PM MST, Brian Cox via
Personal_Submersibles <personal_submersibles@psubs.org> wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Brian C.<br>
<br>
--- personal_submersibles@psubs.org wrote:<br>
<br>
From: Alec Smyth via Personal_Submersibles
<personal_submersibles@psubs.org><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Subject: Re: [PSUBS-MAILIST] annealing windows<br>
Date: Sat, 21 Nov 2015 23:00:28 -0500<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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 stre! ss concentrator in a spot where you <u>really</u>
do not want one.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Best,<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><br>
Alec<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>On Sat, Nov 21, 2015 at 10:32 PM, Brian Cox via
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color="#888888" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#888888'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Brian Cox<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><br>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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