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<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'>
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<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 <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 2:59
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
<personal_submersibles@psubs.org> 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 <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> 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 <personal_submersibles@psubs.org> 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>
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