<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2" style="font-family: Arial, sans-serif;">Alan,</FONT><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"> I agree Alan, There are some good programmable units out there. I actually bought one that was made for a similar purpose ( can't remember what) But I ended up monitoring the whole process over the coarse of 48 hours or so, but I was able to arrange it so the long stretches of hold temperatures were at night so I could sleep. </FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif">Brian</FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"> </FONT><BR></FONT><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">From: Alan via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] PVHO rules</SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Date: Mon, 22 Apr 2019 12:57:15 +1200</SPAN><BR><BR><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">Hank,</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">not quite following you on that. Modern temperature controllers have PID control.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">They predict when to turn on or off rather than react to the sensor hitting a </DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">certain temperature. </DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">Lots of cheap ones out there. Not saying this is ideal but just an example...</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><A href="https://www.ebay.com/itm/Dual-Digital-F-C-PID-Temperature-Controller-Furnace-Kiln-Oven-Thermocouple/230780863978?hash=item35bb9c85ea:g:8AAAAOSwPcVVk5Iq">https://www.ebay.com/itm/Dual-Digital-F-C-PID-Temperature-Controller-Furnace-Kiln-Oven-Thermocouple/230780863978?hash=item35bb9c85ea:g:8AAAAOSwPcVVk5Iq</A></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">When I was annealing my acrylic I had to drop the temperature by a degree every</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">hour & was monitoring it through the night. Much better to be able to program</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">the ramping of the temperature.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">Alan</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><BR>On 22/04/2019, at 12:09 PM, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV><DIV style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><DIV></DIV>
<DIV>Alan,</DIV><DIV>I talked with Brian Cox because he annealed his own ports. He is Brilliant in the way he controls the heat. He uses a variable voltage supply instead of turning the heating elements on and off with a sensor and relay. He just pre determines the temperature at given voltages and then controls the voltage for constant temperature control. Just brilliant!</DIV><DIV>Hank</DIV><DIV><BR></DIV>
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On Sunday, April 21, 2019, 5:23:33 PM MDT, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:
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<DIV><DIV><DIV><DIV></DIV><DIV>Hank,</DIV><DIV>that was great of River to help out!</DIV><DIV>If it were me I would definitely machine it seeing you have to machine</DIV><DIV>the clamping area off on a pressed dome anyway. Way less work in</DIV><DIV>every way. </DIV><DIV>BTW glass artists can ramp the temperature of their kiln down over</DIV><DIV>2 weeks with thick art work. May be ideal to find a local one.</DIV><DIV>I am full of suggestions lol.</DIV><DIV>Alan</DIV><DIV><DIV><BR>On 22/04/2019, at 10:49 AM, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><DIV></DIV>
<DIV>Alan, here is the drawing of the window, big thanks to River for helping with that. I think it may be easier to just machine it also . I have sourced the acrylic at 8 inches think already. I am just waiting to finalize the frame seat design before I pull the trigger.</DIV><DIV>Hank</DIV>
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On Sunday, April 21, 2019, 4:33:47 PM MDT, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:
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<DIV><DIV><DIV><DIV></DIV><DIV>Hank,</DIV><DIV>If it is just 3" deflection then you would need to go to a 8" thick acrylic if</DIV><DIV>you machined.</DIV><DIV>Just thinking there would be less waste around the perimeter on a machined</DIV><DIV>dome as apposed to a pressed dome & you would need to do some machining</DIV><DIV>& polishing on a pressed dome anyway.</DIV><DIV>Might be a lot easier to machine it & build a small oven, or if you know a potter</DIV><DIV>or glass blower with a suitable kiln, get them to anneal it.</DIV><DIV>Alan</DIV><DIV><DIV><BR>On 22/04/2019, at 9:40 AM, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><DIV></DIV>
<DIV>Alan,</DIV><DIV>The lucky thing is it only has approximately 3 inch deflection and I will use hydraulic pressure.</DIV><DIV>Hank</DIV><DIV><BR></DIV>
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On Sunday, April 21, 2019, 2:31:25 PM MDT, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:
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<DIV><DIV><DIV><DIV></DIV><DIV>Hank,</DIV><DIV>Spelling mistake. Pressure is going to be HUGE.</DIV><DIV>Alan</DIV><DIV><DIV><BR>On 22/04/2019, at 8:28 AM, Alan <<A href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV></DIV></BLOCKQUOTE></DIV></DIV><DIV><DIV><DIV></DIV><DIV>Hank,</DIV><DIV>I had a go at forming an acrylic ring out of a straight piece of 1" thick</DIV><DIV>cast acrylic, using a modified kitchen oven.</DIV><DIV>At forming temperature the acrylic was like the hardness of eraser rubber.</DIV><DIV>Maybe there is technical literature on what shore hardness it actually is at</DIV><DIV>forming temperature. Anyway if you are forming a 5" block the pressure</DIV><DIV>Required is going to be used.</DIV><DIV>When I had a 1" thick dome blown for me they had to stop & get thicker</DIV><DIV>Clamping rings made.</DIV><DIV>Emile or Greg may like to comment on this as they have had a lot more experience.</DIV><DIV>You will need a temperature controller for a kiln, & program it for your requirements.</DIV><DIV>It will be a few days in the oven I would imagine.</DIV><DIV>If you machine it, can you get away with not heat treating it afterward?</DIV><DIV>I would imagine the stress would only be superficial.</DIV><DIV>Alan</DIV><DIV><BR></DIV><DIV><BR>On 22/04/2019, at 2:11 AM, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><DIV>Hi All,</DIV><DIV>I am looking for the actual PVHO rules for Acrylic forming. I can find all the references to the rules but not the rules. I am planning to make a 5 inch thick 60 degree Hemispherical segment either from forming or from machining out of a thick slab. I prefer to form it because I will need an oven to heat treat it after anyways, but I don't want to form it without the rules.</DIV><DIV>Hank</DIV></DIV></DIV></BLOCKQUOTE><BLOCKQUOTE><DIV><SPAN>_______________________________________________</SPAN><BR><SPAN>Personal_Submersibles mailing list</SPAN><BR><SPAN><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A></SPAN><BR><SPAN><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A></SPAN><BR></DIV></BLOCKQUOTE></DIV></DIV></DIV><DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV></DIV>
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