<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks Dan,</div><div id="AppleMailSignature">just read through 170 pages of the Parker O-ring handbook &</div><div id="AppleMailSignature">couldn't find that information.</div><div id="AppleMailSignature">That makes sense. I can go for a coffee in peace now!</div><div id="AppleMailSignature">Alan<br><br>Sent from my iPad</div><div><br>On 6/02/2017, at 4:14 PM, Dan Hryhorcoff via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
<div dir="ltr">
<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<div>Alan</div>
<div> </div>
<div>Don’t worry about stretch or no stretch. What’s more important is the
squeeze of the O-ring and the clearance between your two mating parts.
</div>
<div> </div>
<div>As long as you get 15-20 % squeeze of the O-ring when assembled and the gap
between the two parts your sealing isn’t so great that the pressure your
operating at isn’t going to allow the O-ring to be extruded out, you’ll be
fine. </div>
<div> </div>
<div>Normally, for an external O-ring groove the O-ring is stretched on with a
bit of stretch when its in it’s groove and when an O-ring is used in an internal
groove application, as yours is, it’s actually a little bit larger then the
groove when it’s inserted in place to help it stays there while the mating part
is inserted. </div>
<div> </div>
<div>For your application forget about stretch. Use a ring that’s to size
if it stays in place good, or one size larger if you have a problem getting the
lens in place without pinching the O-ring.</div>
<div> </div>
<div>Dan H.</div>
<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">
<div style="FONT: 10pt tahoma">
<div> </div>
<div style="BACKGROUND: #f5f5f5">
<div style="font-color: black"><b>From:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">Alan James via
Personal_Submersibles</a> </div>
<div><b>Sent:</b> Sunday, February 05, 2017 9:13 PM</div>
<div><b>To:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">Personal Submersibles General
Discussion</a> </div>
<div><b>Subject:</b> Re: [PSUBS-MAILIST] O-ring Question</div></div></div>
<div> </div></div>
<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">
<div style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif; COLOR: #000; BACKGROUND-COLOR: #fff">
<div><span>Thanks Hank,</span></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2704"><span id="yui_3_16_0_ym19_1_1486346681389_2703">I have 4 O-rings in my light design
& had gone through the calculations</span></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2706" dir="ltr"><span id="yui_3_16_0_ym19_1_1486346681389_2705">before designing. However one of these
O-rings is in the bore groove & I'm</span></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2708" dir="ltr"><span id="yui_3_16_0_ym19_1_1486346681389_2707">having a re-think about this one, but
can't find any specific advice for</span></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2716" dir="ltr"><span id="yui_3_16_0_ym19_1_1486346681389_2753">this application.</span></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2709" dir="ltr"><span id="yui_3_16_0_ym19_1_1486346681389_2715"></span>Alan<br><br></div>
<div class="qtdSeparateBR"><br><br></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2750" class="yahoo_quoted" style="DISPLAY: block">
<div id="yui_3_16_0_ym19_1_1486346681389_2749" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif">
<div id="yui_3_16_0_ym19_1_1486346681389_2748" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif">
<div id="yui_3_16_0_ym19_1_1486346681389_2747" dir="ltr"><font id="yui_3_16_0_ym19_1_1486346681389_2746" size="2" face="Arial">
<hr id="yui_3_16_0_ym19_1_1486346681389_2745" size="1">
<b><span style="FONT-WEIGHT: bold">From:</span></b> hank pronk via
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><b><span style="FONT-WEIGHT: bold">To:</span></b> Personal Submersibles General
Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br><b><span style="FONT-WEIGHT: bold">Sent:</span></b> Monday, February 6, 2017 2:59
PM<br><b><span style="FONT-WEIGHT: bold">Subject:</span></b> Re: [PSUBS-MAILIST]
O-ring Question<br></font></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2760" class="y_msg_container">
<div> </div>
<div id="yiv8923732423">
<div id="yui_3_16_0_ym19_1_1486346681389_2762">
<div id="yui_3_16_0_ym19_1_1486346681389_2761" style="FONT-SIZE: 12px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif; COLOR: rgb(0,0,0); BACKGROUND-COLOR: rgb(255,255,255)">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486346095083_15121"><span>Alan,</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486346095083_15123"><span id="yiv8923732423yui_3_16_0_ym19_1_1486346095083_15122">If your glass is say 2
inces diameter then use a 2 inch o-ring with a groove design from the o-ring
groove chart. You will also find a spec for the </span>clearance between
the glass and housing.</div>
<div id="yui_3_16_0_ym19_1_1486346681389_2763" class="yiv8923732423qtdSeparateBR"><br clear="none"><br clear="none"></div>
<div id="yui_3_16_0_ym19_1_1486346681389_2768" class="yiv8923732423yahoo_quoted" style="DISPLAY: block">
<div id="yui_3_16_0_ym19_1_1486346681389_2767" style="FONT-SIZE: 12px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif">
<div id="yui_3_16_0_ym19_1_1486346681389_2766" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif">
<div id="yiv8923732423yqt35718" class="yiv8923732423yqt7054951802">
<div id="yui_3_16_0_ym19_1_1486346681389_2765" dir="ltr"><font id="yui_3_16_0_ym19_1_1486346681389_2764" size="2" face="Arial">On Sunday, February 5,
2017 6:52 PM, Alan James via Personal_Submersibles
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div><br clear="none"><br clear="none">
<div id="yui_3_16_0_ym19_1_1486346681389_2771" class="yiv8923732423y_msg_container">
<div id="yiv8923732423">
<div id="yui_3_16_0_ym19_1_1486346681389_2770">
<div id="yui_3_16_0_ym19_1_1486346681389_2769" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif; COLOR: rgb(0,0,0); BACKGROUND-COLOR: rgb(255,255,255)">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2619"><span>Hi
Sean,</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2618"><span id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2617">yes had a quick look
through that, along with other material.</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2621"><span id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2620">Spent a couple of hours
& still haven't come up with an answer to</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2623"><span id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2622">what seemed a simple
question!</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2624"><span id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2625">Maybe I'll have to read
through it slowly!</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2636"><span>Cheers
Alan</span></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2559" class="yiv8923732423qtdSeparateBR"><br clear="none"><br clear="none"></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2642" class="yiv8923732423yahoo_quoted" style="DISPLAY: block">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2641" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2640" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif">
<div id="yiv8923732423yqt18282" class="yiv8923732423yqt3854544548">
<div dir="ltr"><font size="2" face="Arial"></font>
<hr size="1">
<b><span style="FONT-WEIGHT: bold">From:</span></b> Sean T. Stevenson via
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"><b><span style="FONT-WEIGHT: bold">To:</span></b> Personal
Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"><b><span style="FONT-WEIGHT: bold">Sent:</span></b> Monday, February
6, 2017 2:39 PM<br clear="none"><b><span style="FONT-WEIGHT: bold">Subject:</span></b> Re: [PSUBS-MAILIST] O-ring
Question<br clear="none"></div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2639" class="yiv8923732423y_msg_container">
<div> </div>
<div id="yiv8923732423">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2638">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2637" 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 dir="ltr">Sean<br clear="none"></div><br clear="none"><br clear="none">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2645" class="yiv8923732423gmail_quote">On February 5, 2017 6:32:51 PM MST, Alan James
via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
<blockquote id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2644" class="yiv8923732423gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486345637108_2643" style="FONT-SIZE: 16px; FONT-FAMILY: helveticaneue, helvetica neue, helvetica, arial, lucida grande, sans-serif; COLOR: rgb(0,0,0); BACKGROUND-COLOR: rgb(255,255,255)">
<div id="yiv8923732423yui_3_16_0_ym19_1_1486343895596_2802">Hi,</div>
<div id="yiv8923732423yui_3_16_0_ym19_1_1486343895596_2793" dir="ltr">am having
trouble Googling an answer to this question.</div>
<div id="yiv8923732423yui_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="yiv8923732423yui_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="yiv8923732423yui_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="yiv8923732423yui_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="yiv8923732423yui_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="yiv8923732423yui_3_16_0_ym19_1_1486343895596_2874" dir="ltr">their should
be any pressure on the rotating rod.</div>
<div id="yiv8923732423yui_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="yiv8923732423yui_3_16_0_ym19_1_1486343895596_2918" dir="ltr">Thanks,
Alan</div></div>
<div style="MARGIN-BOTTOM: 1em; BORDER-BOTTOM: rgb(0,0,0) 1px solid; MARGIN-TOP: 2.5em"></div><pre class="yiv8923732423k9mail"></pre>
<hr>
<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape="rect" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></blockquote></div></div></div><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape="rect" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div></div></div></div></div></div></div></div>
<div> </div>
<div id="yiv8923732423yqt13101" class="yiv8923732423yqt3854544548">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape="rect" rel="nofollow" target="_blank">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>
<div> </div>
<div id="yqt04956" class="yqt7054951802">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" shape="rect" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div></div></div></div></div>
<p>
</p><hr>
_______________________________________________<br>Personal_Submersibles mailing
list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div></div></div>
</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>