<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><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><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 type="cite"><div><div class="ydpe9ccc869yahoo-style-wrap" 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 id="yiv6122003748"><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 class="yiv6122003748yqt2927238886" id="yiv6122003748yqt45686"><div><br clear="none">On 22/04/2019, at 9:40 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div class="yiv6122003748ydpfc29a907yahoo-style-wrap" 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 clear="none"></div>
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On Sunday, April 21, 2019, 2:31:25 PM MDT, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="yiv6122003748"><div><div></div><div>Hank,</div><div>Spelling mistake. Pressure is going to be HUGE.</div><div>Alan</div><div class="yiv6122003748yqt5171858883" id="yiv6122003748yqt45364"><div><br clear="none">On 22/04/2019, at 8:28 AM, Alan <<a rel="nofollow" shape="rect" ymailto="mailto:alanlindsayjames@yahoo.com" target="_blank" href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div></div></blockquote></div></div><div class="yiv6122003748yqt5171858883" id="yiv6122003748yqt09748"><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 clear="none"></div><div><br clear="none">On 22/04/2019, at 2:11 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div class="yiv6122003748yahoo-style-wrap" 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 type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div></div></div><div class="yiv6122003748yqt5171858883" id="yiv6122003748yqt28670">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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