<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span>Sean,</span></div><div id="yui_3_16_0_1_1446999104063_4823"><span>By all means, anyone is welcome to any drawings I obtain or map from the Pisces. I </span>actually already have material price to machine the hatch from a solid disk of 516-70N this way it is one piece with no welds. I just need the drawing first to order the disk.</div><div id="yui_3_16_0_1_1446999104063_4822">Hank</div> <br><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font size="2" face="Arial"> On Sunday, November 8, 2015 8:52 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br> </font> </div> <br><br> <div class="y_msg_container">I'd be interested in having a look at those drawings. The idea with a<br clear="none">conical bearing face on a hatch, if you are not trying to establish a<br clear="none">metal-to-metal seal, is to provide a load path through the hatch itself<br clear="none">to carry the shell stress that would otherwise require heavy<br clear="none">reinforcement around the hole. Thus, the "ideal" hatch would be the<br clear="none">same thickness and curvature as the shell it is replacing, aligned to it<br clear="none">so the load transfers straight through, with a flange on both the hatch<br clear="none">and shell parts to create a substantial bearing face. The conical angle<br clear="none">in that case would be set by the hatch diameter, as the ideal interface<br clear="none">angle would be perpendicular to the shell at every point. I suspect<br clear="none">that in practice, the cone is exaggerated beyond that, because we're<br clear="none">talking about very small angles on larger spheres - on a PSub, perhaps<br clear="none">it is more important. The other advantage is of course the self-centering.<br clear="none"><br clear="none">Sean<br clear="none"><br clear="none"><div class="yqt0789871204" id="yqtfd68594"><br clear="none">On 2015-11-07 16:26, hank pronk via Personal_Submersibles wrote:<br clear="none">> Dr Nuytten thinks he has detail drawings that he is willing to share<br clear="none">> with me, if he can not find them, he has given me permission to measure<br clear="none">> one of his Pisces in the bone yard. I may have a look for myself even<br clear="none">> with drawings, just because I am a visual guy- if I see it I can make<br clear="none">> it. Besides, how fun is a day at the Nuytco bone yard :-)<br clear="none">> Hank <br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>