<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Alan,</div><div>When I was down diving with Karl Stanley earlier this year he showed me the veiwport that cracked. It was caused by him taking his sub to deep and the body warped putting side pressure on the veiwport. After that he derated his depth. This was on his first sub CBUG.</div><div>Thanks,</div><div>Scott Waters</div><div><br></div><div><br></div><div><div style="font-size:9px;color:#575757">Sent from my U.S. Cellular® Smartphone</div></div><div></div><br><br>-------- Original message --------<br>From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org> <br>Date:07/07/2015 4:27 PM (GMT-06:00) <br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br>Cc: <br>Subject: Re: [PSUBS-MAILIST] calculation <br><br><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1436303913414_3141"><span id="yui_3_16_0_1_1436303913414_4230">Hank,</span></div><div id="yui_3_16_0_1_1436303913414_3141"><span id="yui_3_16_0_1_1436303913414_3425">I remember Karl Stanley (or someone else) saying he cracked a dome at depth</span></div><div id="yui_3_16_0_1_1436303913414_4231">due to an unexpected contraction of the pressure hull.</div><div id="yui_3_16_0_1_1436303913414_4232">Just in case everything is not right; how about an unmanned dive!</div><div id="yui_3_16_0_1_1436303913414_4232">You could record any noises by putting something like your cel phone in the hull</div><div id="yui_3_16_0_1_1436303913414_4232" dir="ltr">on record.</div><div id="yui_3_16_0_1_1436303913414_4232">Then synchronize a watch on the support boat & record what depths you have</div><div id="yui_3_16_0_1_1436303913414_4232" dir="ltr">the sub down at at what times. So if you get a big "Crack" on your recording you </div><div id="yui_3_16_0_1_1436303913414_4232" dir="ltr">will be able to tell at what depth it happened.</div><div id="yui_3_16_0_1_1436303913414_4232" dir="ltr">Easier said than done I know, but probably worth it.</div><div id="yui_3_16_0_1_1436303913414_4232" dir="ltr">Cheers Alan</div> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1436303913414_5035"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1436303913414_5034"> <div dir="ltr" id="yui_3_16_0_1_1436303913414_5033"> <hr size="1" id="yui_3_16_0_1_1436303913414_5032"> <font size="2" face="Arial" id="yui_3_16_0_1_1436303913414_5036"> <b><span style="font-weight:bold;">From:</span></b> hank pronk 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;">Sent:</span></b> Wednesday, July 8, 2015 12:26 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] calculation<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1436303913414_7442"><br><br clear="none">Alan,<br clear="none">When my dome made the mystery noise, I was at 100 feet deep. That puts about 18 tons on the dome. I think it was either the straps were able to relax and find their happy place, or, the super cold water made the dome contract.<br clear="none">Hank--------------------------------------------<br clear="none">On Mon, 7/6/15, Alan James via Personal_Submersibles <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"> Subject: Re: [PSUBS-MAILIST] calculation<br clear="none"> To: "Personal Submersibles General Discussion" <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> Received: Monday, July 6, 2015, 9:00 PM<br clear="none"> <br clear="none"> Hank,I was<br clear="none"> looking at some Deep Worker photos. The dome retaining<br clear="none"> bandslook like<br clear="none"> they can be wound tight from a central point at the<br clear="none"> top.I am<br clear="none"> wondering if they pre stress these significantly so that<br clear="none"> there is less movementwhen they<br clear="none"> are compressed at depth. <br clear="none"> Also I<br clear="none"> commented on your retaining system when I first saw it, that<br clear="none"> I thought thevertical<br clear="none"> floatational force might move it upward, or the dome pivot<br clear="none"> out from the bottom.Perhaps<br clear="none"> you could exert more pressure on the dome with your clamping<br clear="none"> system?<br clear="none"> Alan<br clear="none"> <br clear="none"> From: Alec Smyth via<br clear="none"> Personal_Submersibles<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"> <br clear="none"> To: Personal<br clear="none"> Submersibles General Discussion<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"> <br clear="none"> Sent: Tuesday,<br clear="none"> July 7, 2015 12:31 PM<br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] calculation<br clear="none"> <br clear="none"> <br clear="none"> Does the<br clear="none"> window seat have some sort of inside diameter edge? I would<br clear="none"> think if it does not, then its pretty much guaranteed to<br clear="none"> slip with or without grease - with grease being the quieter<br clear="none"> less-terrifying option.<br clear="none"> Best,<br clear="none"> Alec<br clear="none"> <br clear="none"> <br clear="none"> On Mon,<br clear="none"> Jul 6, 2015 at 6:50 PM, hank pronk via Personal_Submersibles<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"> wrote:<br clear="none"> <br clear="none"> <br clear="none"> Sean,<br clear="none"> <br clear="none"> Thank you for the input, I think I will just use weights<br clear="none"> like Alan says.<br clear="none"> <br clear="none"> I am making a fixture to simulate the EPDM gasket compressed<br clear="none"> under my dome. I want to test it with grease and<br clear="none"> without. I will squeeze the gasket in the fixture then<br clear="none"> push the top plate sideways with a pusher bolt to see if the<br clear="none"> gasket allows movement. I want to make sure my dome can<br clear="none"> expand and contract at depth.<br clear="none"> <br clear="none"> Hank<br clear="none"> <br clear="none"> --------------------------------------------<br clear="none"> <br clear="none"> On Mon, 7/6/15, Sean T. Stevenson via Personal_Submersibles<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"> wrote:<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Subject: Re: [PSUBS-MAILIST] calculation<br clear="none"> <br clear="none"> To: "Personal Submersibles General Discussion"<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"> <br clear="none"> Received: Monday, July 6, 2015, 9:08 AM<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Hank - the force developed is dependent on the<br clear="none"> <br clear="none"> stiffness of both the bolt material and of the specimen<br clear="none"> <br clear="none"> you're pushing on. You can't necessarily<br clear="none"> equate<br clear="none"> <br clear="none"> this directly to torque because of friction in the bolt<br clear="none"> <br clear="none"> threads and at the bolt end contact, and of course the<br clear="none"> <br clear="none"> elasticity of the bolt itself. You can only estimate<br clear="none"> it. <br clear="none"> <br clear="none"> There are many online tools for calculating the<br clear="none"> developed<br clear="none"> <br clear="none"> tensile force in a bolted connection, for example, but<br clear="none"> these<br clear="none"> <br clear="none"> consider only the bolt as the deformable element, and<br clear="none"> <br clear="none"> require an accurate estimate of coefficients of<br clear="none"> friction,<br clear="none"> <br clear="none"> and this will change with lubrication. As you complicate<br clear="none"> the<br clear="none"> <br clear="none"> system, it becomes more geometry dependent.<br clear="none"> <br clear="none"> A 1" - 8 UNC 2A thread is 8 threads per<br clear="none"> <br clear="none"> inch, so a set number of turns will give you the<br clear="none"> approximate<br clear="none"> <br clear="none"> axial displacement (0.125" per revolution -<br clear="none"> approximate<br clear="none"> <br clear="none"> because the bolt will change length under load). If you<br clear="none"> <br clear="none"> assume a rigid fixture, then your strain is equal to<br clear="none"> the<br clear="none"> <br clear="none"> overall change in length (calculated from # of bolt<br clear="none"> turns),<br clear="none"> <br clear="none"> divided by the gauge length (distance over which the<br clear="none"> length<br clear="none"> <br clear="none"> change occurs, which would be the length of your<br clear="none"> specimen<br clear="none"> <br clear="none"> measured between the rigid fixture and the end of your<br clear="none"> jack<br clear="none"> <br clear="none"> bolt). Compressive or tensile load is then calculated<br clear="none"> based<br clear="none"> <br clear="none"> on the modulus of elasticity of the specimen. <br clear="none"> <br clear="none"> Alternatively, you can measure the load (make the bolt<br clear="none"> or<br clear="none"> <br clear="none"> fixture into a load cell or strain gauge the specimen)<br clear="none"> and<br clear="none"> <br clear="none"> calculate the material properties.<br clear="none"> <br clear="none"> Load, axial displacement, modulus. You need any<br clear="none"> <br clear="none"> two to calculate the third.<br clear="none"> <br clear="none"> What are you making / testing?<br clear="none"> <br clear="none"> Sean<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> On July 6, 2015 6:26:49 AM<br clear="none"> <br clear="none"> MDT, hank pronk via Personal_Submersibles<br clear="none"> <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"> wrote:<br clear="none"> <br clear="none"> Hi all,<br clear="none"> <br clear="none"> I<br clear="none"> <br clear="none"> need help, can anyone tell me how to calculate how much<br clear="none"> <br clear="none"> force a bolt can push or pull using a torque wrench to<br clear="none"> turn<br clear="none"> <br clear="none"> the bolt. So how many foot pounds of torque does it take<br clear="none"> to<br clear="none"> <br clear="none"> rotate a bolt to create 250 lbs push with a 1 in<br clear="none"> coarse<br clear="none"> <br clear="none"> thread bolt. I need to make a test fixture.<br clear="none"> <br clear="none"> Hank<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Personal_Submersibles mailing<br clear="none"> list<br clear="none"> <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"> <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"> <br clear="none"> <br clear="none"> <br clear="none"> -----Inline Attachment Follows-----<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> _______________________________________________<br clear="none"> <br clear="none"> Personal_Submersibles mailing<br clear="none"> list<br clear="none"> <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"> <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"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> _______________________________________________<br clear="none"> <br clear="none"> Personal_Submersibles mailing<br clear="none"> list<br clear="none"> <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"> <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><div class="qtdSeparateBR"><br><br></div><div class="yqt1499698680" id="yqtfd52940"><br clear="none"> <br clear="none"> <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"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> -----Inline Attachment Follows-----<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"> <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></div><br><br></div> </div> </div> </div></body></html>