<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks Cliff, good link.</div><div id="AppleMailSignature">It was just that 1 O-ring in the bore that I wasn't sure of the</div><div id="AppleMailSignature">stretch required.</div><div id="AppleMailSignature">I have re-designed my light housing ( will post it later) & are</div><div id="AppleMailSignature">pretty happy with it. The big thing will be how many Watts I</div><div id="AppleMailSignature">can run it at without it overheating.</div><div id="AppleMailSignature">Alan<br><br>Sent from my iPad</div><div><br>On 7/02/2017, at 4:12 AM, Cliff Redus 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>Alan, the easiest way to get the perfect O-ring grove is to go to <a href="http://divapps.parker.com/divapps/seal/mobile/MaterialSelection/MobileinPHorm.aspx">http://divapps.parker.com/divapps/seal/mobile/MaterialSelection/MobileinPHorm.aspx</a> which is Parker's in PHorm software running as an online app. This site completely specs the gland and gland seat under just about any loading condition you can think of and prints out a nice report including a diagram of the grove with all the correct dimensions. It is lot easier than trying to digest the 170 page Parker O-ring book. On stretch for this application, I concur with Dan's comments.</div><div><br></div><div>Cliff</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 5, 2017 at 7:32 PM, Alan James via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div 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="m_-48017345975523151yui_3_16_0_ym19_1_1486343895596_2802"> Hi,</div><div id="m_-48017345975523151yui_3_16_0_ym19_1_1486343895596_2793" dir="ltr">am having trouble Googling an answer to this question.</div><div id="m_-48017345975523151yui_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="m_-48017345975523151yui_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="m_-48017345975523151yui_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="m_-48017345975523151yui_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="m_-48017345975523151yui_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="m_-48017345975523151yui_3_16_0_ym19_1_1486343895596_2874" dir="ltr">their should be any pressure on the rotating rod.</div><div id="m_-48017345975523151yui_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="m_-48017345975523151yui_3_16_0_ym19_1_1486343895596_2918" dir="ltr">Thanks, Alan</div></div></div><br>______________________________<wbr>_________________<br>
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