<html><head></head><body><p dir="ltr">I would suggest characterising this exactly - do you have access to ultrasonic measurement? With the halves already welded, getting a caliper in might be tricky.</p>
<p dir="ltr">Use a template to measure the out-of-round deviation in the worst possible plane. (Radius to match your design outer radius, subtending 120° of arc) If the radial distance between the template and the shell surface never exceeds 1/2 percent of the overall diameter at any point, then you're good to go. Just locate and measure the minimum shell thickness and use that measurement to determine the maximum allowable working depth.</p>
<p dir="ltr">Looking forward, it's probably worth having a chat with someone at EE to explain why sphericity is critical, and seeing if they can accommodate you. They probably don't deal with many externally pressurised vessels, so e.g. additional press steps may be within their capabilities, but just not have occurred to them to do.</p>
<p dir="ltr">Personally, I hate talking to people on the phone, so I create engineering drawings which are exhaustively toleranced, such that there is no way a supplied part could comply with the drawing and not be suitable. If a part doesn't meet the spec, I don't accept it.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On October 24, 2015 7:11:09 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top"><div>Sean,<br />I would say just out of round, very slightly.<br />Hank</div></td></tr></tbody></table> <div id="_origMsg_">
<div>
<br />
<div>
<div style="font-size:0.9em">
<hr size="1" />
<b>
<span style="font-weight:bold">From:</span>
</b>
Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org>; <br />
<b>
<span style="font-weight:bold">To:</span>
</b>
Personal Submersibles General Discussion <personal_submersibles@psubs.org>; <br />
<b>
<span style="font-weight:bold">Subject:</span>
</b>
Re: [PSUBS-MAILIST] Fw: <br />
<b>
<span style="font-weight:bold">Sent:</span>
</b>
Sat, Oct 24, 2015 12:54:54 PM <br />
</div>
<br />
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top"><p dir="ltr">Is it thinning, or just out of round?</p>
<p dir="ltr">Sean<br clear="none" />
</p>
<br clear="none" /><br clear="none" /><div class="gmail_quote">On October 24, 2015 5:54:59 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex;">
<div class="yqt1450293297" id="yqt93871"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"><div id="yui_3_16_0_1_1445687195940_3031"><span id="yui_3_16_0_1_1445687195940_3154">Hi Emile ,</span></div><div dir="ltr" id="yui_3_16_0_1_1445687195940_2866"><span id="yui_3_16_0_1_1445687195940_2865">I thought the fold line in the heads might be a Canadian fabrication trait, but after studying pictures of Nordic Sub, I see the exact same fold. I assume you sourced your heads in Europe. Did you increase the thickness to compensate, or is it a non issue. </span></div><div dir="ltr" id="yui_3_16_0_1_1445687195940_2866"><span>Thanks'</span></div><div dir="ltr" id="yui_3_16_0_1_1445687195940_2866"><span>Hank</span></div> <br clear="none" /><div class="qtdSeparateBR"><br clear="none" /><br clear="none" /></div><div class="yahoo_quoted" style="display:block;"> <div
style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, s-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 Friday, October 23, 2015 1:56 PM, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br clear="none" /> </font> </div> <br clear="none" /><br clear="none" /> <div class="y_msg_container"><div id="yiv4114809703"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"><div id="yiv4114809703yui_3_16_0_1_1445629651842_2718"><span>James,</span></div><div dir="ltr" id="yiv4114809703yui_3_16_0_1_1445629651842_2718"><span id="yiv4114809703yui_3_16_0_1_1445629651842_2931">I am planning a sphere sub with at least a 2,000 foot depth rating. I am inspired by Scott's
determination and I am pretty sure I can do it for a cost I can manage.</span></div><div dir="ltr" id="yiv4114809703yui_3_16_0_1_1445629651842_2718"><span id="yiv4114809703yui_3_16_0_1_1445629651842_2928">I love the Pisces style occupant sphere with the conical ports. I want to build it purely for the fun of it, with no time limit or practical reason. </span></div><div dir="ltr" id="yiv4114809703yui_3_16_0_1_1445629651842_2718"><span>Hank </span></div> <br clear="none" /><div class="yiv4114809703qtdSeparateBR"><br clear="none" /><br clear="none" /></div><div class="yiv4114809703yahoo_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 class="yiv4114809703yqt8633969530" id="yiv4114809703yqt74969"><div dir="ltr"> <font size="2" face="Arial"> On Friday, October
23, 2015 6:53 AM, James Frankland via Personal_Submersibles
<personal_submersibles@psubs.org> wrote:<br clear="none" /> </font> </div> <br clear="none" /><br clear="none" /> <div class="yiv4114809703y_msg_container"><div id="yiv4114809703"><div><div dir="ltr">Picture made it, but its a bit of a tiddler. However, I can see what you mean. Its almost like a slight fold line. From what you said I was thinking more of a crinkle. It doesn't really look that bad, but then I suppose you want it to be perfect. Whats the new project going to be? </div><div class="yiv4114809703gmail_extra"><br clear="none" /><div class="yiv4114809703gmail_quote">On 23 October 2015 at 13:37, hank pronk via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="javascript:return">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none" /><blockquote class="yiv4114809703gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex;"><div class="yiv4114809703yqt6858941269" id="yiv4114809703yqt47279"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255,255,255);"><div>If this picture makes it :-) you can see two crease lines, the first one is about 4 inches above the weld line and the next one is about 8 inches above the weld line.</div><div>Thanks'</div><div>Hank</div><div><br clear="none" /><br clear="none" /></div> <div 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 face="Arial" size="2"> On Friday, October 23, 2015 6:34 AM, hank pronk <<a rel="nofollow" shape="rect" ymailto="mailto:hankpronk@live.ca" target="_blank"
href="javascript:return">hankpronk@live.ca</a>> wrote:<br clear="none" /> </font> </div> <br clear="none" /><br clear="none" /> <div><div>
<div><div dir="ltr"> </div></div>
</div><br clear="none" /><br clear="none" /></div> </div> </div> </div> </div></div></div><br clear="none" />_______________________________________________<br clear="none" />
Personal_Submersibles mailing list<br clear="none" />
<a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="javascript:return">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" />
<br clear="none" /></blockquote></div><br clear="none" /></div></div></div><br clear="none" /><div class="yiv4114809703yqt6858941269" id="yiv4114809703yqt10101">_______________________________________________<br clear="none" />Personal_Submersibles mailing list<br clear="none" /><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="javascript:return">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><br clear="none" /><br clear="none" /></div></div> </div> </div> </div></div></div></div><br clear="none" /><div class="yqt8633969530" id="yqt59183">_______________________________________________<br clear="none" />Personal_Submersibles mailing list<br clear="none" /><a rel="nofollow" shape="rect"
ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="javascript:return">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><br clear="none" /><br clear="none" /></div> </div> </div> </div></div></div><p style="margin-top:2.5em;margin-bottom:1em;border-bottom:1px solid #000;"></p><pre class="k9mail"></pre><hr /><br clear="none" />Personal_Submersibles mailing list<br clear="none" />Personal_Submersibles@psubs.org<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" /></blockquote></div></td></tr></tbody></table>
</div>
</div>
</div>
<p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Personal_Submersibles mailing list<br />Personal_Submersibles@psubs.org<br /><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /></pre></blockquote></div></body></html>