<html><body><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. 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