<html><head></head><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_ym19_1_1486345637108_4306"><span id="yui_3_16_0_ym19_1_1486345637108_4305">Another way of looking at it is, if you have a groove in a </span></div><div id="yui_3_16_0_ym19_1_1486345637108_4316" dir="ltr"><span id="yui_3_16_0_ym19_1_1486345637108_4315">cylinder & have a 2% stretch on the O-ring, it pulls the O-ring</span></div><div id="yui_3_16_0_ym19_1_1486345637108_4313" dir="ltr"><span id="yui_3_16_0_ym19_1_1486345637108_4314">in to the base of the groove. Whereas if you have a 2%</span></div><div id="yui_3_16_0_ym19_1_1486345637108_4312" dir="ltr"><span id="yui_3_16_0_ym19_1_1486345637108_4325">stretch on an o-ring in a bore grove it will pull the o-ring</span></div><div id="yui_3_16_0_ym19_1_1486345637108_4317" dir="ltr"><span id="yui_3_16_0_ym19_1_1486345637108_4324">away from the base of the groove but on to the piston.</span></div><div id="yui_3_16_0_ym19_1_1486345637108_4336" dir="ltr"><span>So not sure which way to go here.</span></div><div dir="ltr"><span>Alan</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1486345637108_4260"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1486345637108_4255" style="display: block;"> <div id="yui_3_16_0_ym19_1_1486345637108_4254" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1486345637108_4253" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1486345637108_4259" dir="ltr"> <font id="yui_3_16_0_ym19_1_1486345637108_4323" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1486345637108_4322"> <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;">Sent:</span></b> Monday, February 6, 2017 2:39 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] O-ring Question<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1486345637108_4252"><br><div id="yiv9891858103"><div id="yui_3_16_0_ym19_1_1486345637108_4308"><div id="yui_3_16_0_ym19_1_1486345637108_4307" dir="ltr">Alan, do you have a copy of the Parker O-ring handbook? Best free resource out there for designing O-ring seals. ORD5700.pdf Download it from the Parker website.</div>
<div id="yui_3_16_0_ym19_1_1486345637108_4337" dir="ltr">Sean<br>
</div>
<br><br><div class="yiv9891858103gmail_quote" id="yui_3_16_0_ym19_1_1486345637108_4311">On February 5, 2017 6:32:51 PM MST, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="yiv9891858103gmail_quote" id="yui_3_16_0_ym19_1_1486345637108_4310" style="margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">
<div id="yui_3_16_0_ym19_1_1486345637108_4309" style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2802"> Hi,</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2793" dir="ltr">am having trouble Googling an answer to this question.</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2551" dir="ltr"> I have an O-ring groove in the bore of my light housing, sealing</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2792" dir="ltr">between the bore & the side of my acrylic lens as per attached diagram.</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2791" dir="ltr">On a piston O-ring groove it calls for an optimal 2% stretch & not more than 5%.</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2886" dir="ltr">I can't find any reference to what stretch if any should be, if any, for an o-ring</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2888" dir="ltr">in a bore groove. I did see that in a!
rotary
application they don't advice that</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2874" dir="ltr">their should be any pressure on the rotating rod.</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2887" dir="ltr">Should I be designing so that the o-ring will have a 2% stretch around the lens?</div><div id="yiv9891858103yui_3_16_0_ym19_1_1486343895596_2918" dir="ltr">Thanks, Alan</div></div><div style="margin-top: 2.5em; margin-bottom: 1em; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"></div><pre class="yiv9891858103k9mail"><hr><br>Personal_Submersibles mailing list<br>Personal_Submersibles@psubs.org<br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></pre></blockquote></div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></body></html>