<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_1436261420406_4628"><span id="yui_3_16_0_1_1436261420406_4930">Thanks Phil,</span></div><div dir="ltr" id="yui_3_16_0_1_1436261420406_4627"><span id="yui_3_16_0_1_1436261420406_4931">that puts that theory to bed then.</span></div><div dir="ltr" id="yui_3_16_0_1_1436261420406_4627"><span id="yui_3_16_0_1_1436261420406_5014">So what failed on the dome? Was it a laminated flange or</span></div><div dir="ltr" id="yui_3_16_0_1_1436261420406_4627"><span>some thing like that?</span></div><div dir="ltr" id="yui_3_16_0_1_1436261420406_4627"><span>Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1436261420406_4539"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1436261420406_4538"> <div dir="ltr" id="yui_3_16_0_1_1436261420406_4537"> <hr size="1" id="yui_3_16_0_1_1436261420406_4626"> <font size="2" face="Arial" id="yui_3_16_0_1_1436261420406_4536"> <b><span style="font-weight:bold;">From:</span></b> Phil Nuytten 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> Tuesday, July 7, 2015 5:21 PM<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_1436261420406_4603"><br><div id="yiv8277963177"><div dir="ltr" id="yui_3_16_0_1_1436261420406_4607">
<div dir="ltr" id="yui_3_16_0_1_1436261420406_4606">
<div style="FONT-SIZE:12pt;FONT-FAMILY:'Calibri';COLOR:#000000;" id="yui_3_16_0_1_1436261420406_4605">
<div id="yui_3_16_0_1_1436261420406_4604">Alan</div>
<div id="yui_3_16_0_1_1436261420406_4608">The DeepWorker stainless dome retainer straps can’t be ‘wound tight’ – they
go to a central UHMW hub just to put an even load on the acrylic hemi. The
retaining straps are there to prevent the dome from burping or blowing off if
the sub were to develop a high internal pressure that was unrelieved because of
failure or damage to the over pressure vent. An unlikely event, but I did have a
dome blow partly off in the early prototype ‘Sea Urchin’ many years ago. This
was just upon hitting the surface with a relatively small overpressure. That was
the last time I dove a sub without dome retainers. The water, she come in very
fast! It was during a shoot for a show called ‘Frontier Man’ – I
think it’s still on Youtube somewhere. </div>
<div id="yui_3_16_0_1_1436261420406_4609">Phil </div>
<div style="FONT-SIZE:small;TEXT-DECORATION:none;" id="yui_3_16_0_1_1436261420406_4612">
<div style="FONT:10pt tahoma;" id="yui_3_16_0_1_1436261420406_4611">
<div id="yui_3_16_0_1_1436261420406_4610"> </div>
<div class="qtdSeparateBR"><br><br></div><div class="yiv8277963177yqt2071920592" id="yiv8277963177yqt56360"><div style="BACKGROUND:#f5f5f5;" id="yui_3_16_0_1_1436261420406_4615">
<div style="" id="yui_3_16_0_1_1436261420406_4614"><b id="yui_3_16_0_1_1436261420406_4625">From:</b> <a rel="nofollow" shape="rect" title="personal_submersibles@psubs.org" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1436261420406_4613" title-off="">Alan James via
Personal_Submersibles</a> </div>
<div id="yui_3_16_0_1_1436261420406_4616"><b>Sent:</b> Monday, July 06, 2015 6:00 PM</div>
<div id="yui_3_16_0_1_1436261420406_4618"><b>To:</b> <a rel="nofollow" shape="rect" title="personal_submersibles@psubs.org" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1436261420406_4617" title-off="">Personal Submersibles General
Discussion</a> </div>
<div id="yui_3_16_0_1_1436261420406_4693"><b>Subject:</b> Re: [PSUBS-MAILIST] calculation</div></div></div></div>
<div class="yiv8277963177yqt2071920592" id="yiv8277963177yqt58106"><div id="yui_3_16_0_1_1436261420406_4619"> </div></div></div>
<div class="yiv8277963177yqt2071920592" id="yiv8277963177yqt47869"><div style="FONT-SIZE:small;TEXT-DECORATION:none;" id="yui_3_16_0_1_1436261420406_4621">
<div style="FONT-SIZE:16px;FONT-FAMILY:helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif;COLOR:#000;BACKGROUND-COLOR:#fff;" id="yui_3_16_0_1_1436261420406_4620">
<div id="yiv8277963177yui_3_16_0_1_1436229892486_2801"><span>Hank,</span></div>
<div id="yiv8277963177yui_3_16_0_1_1436229892486_2803"><span id="yiv8277963177yui_3_16_0_1_1436229892486_2802">I was looking at some Deep Worker photos. The
dome retaining bands</span></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805"><span id="yiv8277963177yui_3_16_0_1_1436229892486_2804">look like they can be wound tight from a
central point at the top.</span></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805"><span id="yiv8277963177yui_3_16_0_1_1436229892486_2891">I am wondering if they pre stress these
significantly so that there is less movement</span></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805"><span id="yiv8277963177yui_3_16_0_1_1436229892486_3003">when they are compressed at depth.
<br clear="none"></span></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805"><span id="yiv8277963177yui_3_16_0_1_1436229892486_3063">Also I commented on your retaining system
when I first saw it, that I thought the</span></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805"><span id="yiv8277963177yui_3_16_0_1_1436229892486_3064">vertical floatational force might move it
upward, or the dome pivot out from the bottom.</span></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805">Perhaps you could exert more
pressure on the dome with your clamping system?<br clear="none"></div>
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2805"><span id="yiv8277963177yui_3_16_0_1_1436229892486_3341">Alan</span></div>
<div> </div>
<div id="yiv8277963177yui_3_16_0_1_1436229892486_2895" style="FONT-SIZE:16px;FONT-FAMILY:helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif;">
<div id="yiv8277963177yui_3_16_0_1_1436229892486_2894" style="FONT-SIZE:16px;FONT-FAMILY:helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif;">
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_2893">
<hr id="yiv8277963177yui_3_16_0_1_1436229892486_2892" size="1">
<font id="yiv8277963177yui_3_16_0_1_1436229892486_3201" size="2" face="Arial"><b><span style="FONT-WEIGHT:bold;">From:</span></b> Alec Smyth via Personal_Submersibles
<personal_submersibles@psubs.org><br clear="none"><b><span style="FONT-WEIGHT:bold;">To:</span></b> Personal Submersibles General
Discussion <personal_submersibles@psubs.org> <br clear="none"><b><span style="FONT-WEIGHT:bold;">Sent:</span></b> Tuesday, July 7, 2015 12:31
PM<br clear="none"><b><span style="FONT-WEIGHT:bold;">Subject:</span></b> Re: [PSUBS-MAILIST]
calculation<br clear="none"></font></div>
<div class="yiv8277963177y_msg_container" id="yiv8277963177yui_3_16_0_1_1436229892486_3369">
<div> </div>
<div id="yiv8277963177">
<div id="yiv8277963177yui_3_16_0_1_1436229892486_3371">
<div dir="ltr" id="yiv8277963177yui_3_16_0_1_1436229892486_3370">Does the window seat have some
sort of inside diameter edge? I would think if it does not, then its pretty much
guaranteed to slip with or without grease - with grease being the quieter
less-terrifying option.
<div id="yiv8277963177yui_3_16_0_1_1436229892486_3372"> </div>
<div id="yiv8277963177yui_3_16_0_1_1436229892486_3373">Best,</div>
<div id="yiv8277963177yui_3_16_0_1_1436229892486_3374"> </div>
<div id="yiv8277963177yui_3_16_0_1_1436229892486_3375">Alec</div></div>
<div class="yiv8277963177qtdSeparateBR"><br clear="none"><br clear="none"></div>
<div class="yiv8277963177yqt7039758066" id="yiv8277963177yqt35711">
<div class="yiv8277963177gmail_extra" id="yiv8277963177yui_3_16_0_1_1436229892486_3376">
<div> </div>
<div class="yiv8277963177gmail_quote" id="yiv8277963177yui_3_16_0_1_1436229892486_3377">On Mon,
Jul 6, 2015 at 6:50 PM, hank pronk via Personal_Submersibles <span dir="ltr"><<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>
wrote:<br clear="none">
<blockquote class="yiv8277963177gmail_quote" id="yiv8277963177yui_3_16_0_1_1436229892486_3378" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid;"><br clear="none">Sean,<br clear="none">Thank you for the input, I think I will just
use weights like Alan says.<br clear="none">I am making a fixture to simulate
the EPDM gasket compressed under my dome. I want to test it with grease
and without. I will squeeze the gasket in the fixture then push the top
plate sideways with a pusher bolt to see if the gasket allows movement.
I want to make sure my dome can expand and contract at depth.<br clear="none">Hank<br clear="none">--------------------------------------------<br clear="none">On Mon, 7/6/15, Sean T. Stevenson 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">Subject: Re: [PSUBS-MAILIST]
calculation<br clear="none">To: "Personal Submersibles General Discussion"
<<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">Received: Monday, July 6, 2015, 9:08 AM<br clear="none">
<div>
<div class="yiv8277963177h5"><br clear="none">Hank - the force developed is
dependent on the<br clear="none">stiffness of both the bolt material and of the
specimen<br clear="none">you're pushing on. You can't necessarily
equate<br clear="none">this directly to torque because of friction in the
bolt<br clear="none">threads and at the bolt end contact, and of course the<br clear="none">elasticity of the bolt itself. You can only estimate it. <br clear="none">There are many online tools for calculating the developed<br clear="none">tensile force in a bolted connection, for example, but these<br clear="none">consider only the bolt as the deformable element, and<br clear="none">require an accurate estimate of coefficients of friction,<br clear="none">and this will change with lubrication. As you complicate the<br clear="none">system, it becomes more geometry dependent.<br clear="none">A 1" - 8
UNC 2A thread is 8 threads per<br clear="none">inch, so a set number of turns
will give you the approximate<br clear="none">axial displacement (0.125" per
revolution - approximate<br clear="none">because the bolt will change length
under load). If you<br clear="none">assume a rigid fixture, then your strain is
equal to the<br clear="none">overall change in length (calculated from # of bolt
turns),<br clear="none">divided by the gauge length (distance over which the
length<br clear="none">change occurs, which would be the length of your
specimen<br clear="none">measured between the rigid fixture and the end of your
jack<br clear="none">bolt). Compressive or tensile load is then calculated
based<br clear="none">on the modulus of elasticity of the specimen. <br clear="none">Alternatively, you can measure the load (make the bolt or<br clear="none">fixture into a load cell or strain gauge the specimen) and<br clear="none">calculate the material properties.<br clear="none">Load, axial
displacement, modulus. You need any<br clear="none">two to calculate the
third.<br clear="none">What are you making / testing?<br clear="none">Sean<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">MDT, hank pronk via Personal_Submersibles<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>>
wrote:<br clear="none">Hi all,<br clear="none">I<br clear="none">need help, can
anyone tell me how to calculate how much<br clear="none">force a bolt can push
or pull using a torque wrench to turn<br clear="none">the bolt. So how many foot
pounds of torque does it take to<br clear="none">rotate a bolt to create
250 lbs push with a 1 in coarse<br clear="none">thread bolt. I need to
make a test fixture.<br clear="none">Hank<br clear="none"><br clear="none"></div></div><span class="yiv8277963177">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"><br clear="none"></span>-----Inline Attachment Follows-----<br clear="none"><br clear="none">_______________________________________________<br clear="none"><span class="yiv8277963177">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"><br clear="none"><br clear="none"></span>_______________________________________________<br clear="none">
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<div class="yiv8277963177h5">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></blockquote></div>
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