<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Ping...ping...ping. </div><div>Yup </div><div><br>On Sep 7, 2017, at 1:41 PM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div>me also</div><div>Hank</div><div><br></div>
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On Thursday, September 7, 2017, 11:37:27 AM MDT, k6fee via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="yiv8394128983"><div><div>Reaching me.</div><div><br clear="none"></div><div>Keith T </div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="yiv8394128983composer_signature"><div style="font-size:85%;color:#575757;">Sent from my Verizon, Samsung Galaxy smartphone</div></div><div><br clear="none"></div><div class="yiv8394128983yqt5865361030" id="yiv8394128983yqt72346"><div style="font-size:100%;color:#000000;"><div>-------- Original message --------</div><div>From: Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Date: 9/7/17 10:08 AM (GMT-08:00) </div><div>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Subject: Re: [PSUBS-MAILIST] K-250 Angle Stiffener Web Question </div><div><br clear="none"></div></div><div>Doesn't look like my posts are coming through. Anybody seeing them?</div><div>Rick </div><div><br clear="none"><div class="yiv8394128983gmail_quote"><div>On Thu, Sep 7, 2017 at 9:32 AM Steve McQueen 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"></div><blockquote class="yiv8394128983gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Yes, I have some. I am planning on using them for the light weight stuff. The holes I was contemplating were to help hold a little more weight than those devices might. I was hoping I was done with all the welding but maybe not.<br clear="none">
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Thanks,<br clear="none">
Steve<br clear="none">
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---- Alec Smyth 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">
> Steve,<br clear="none">
><br clear="none">
> If you go to a hardware store you might find some little aluminum security<br clear="none">
> devices for locking sliding doors. I'm sure TrueValue has better (wink wink<br clear="none">
> for Scott) but at Home Depot I found some that fit the K250 stiffener<br clear="none">
> flanges perfectly. They clamp on with a set screw, and give you a tab you<br clear="none">
> can drill for attaching things.<br clear="none">
><br clear="none">
> Best,<br clear="none">
><br clear="none">
> Alec<br clear="none">
><br clear="none">
> On Thu, Sep 7, 2017 at 10:24 AM, Steve McQueen 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">
><br clear="none">
> > Sean, thanks. I was hoping you would respond : ) I did have a clamping<br clear="none">
> > approach in mind that I will revisit.<br clear="none">
> > Thanks,<br clear="none">
> > Steve<br clear="none">
> ><br clear="none">
> > ---- "Sean T. Stevenson 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">
> > > The minimum moment of inertia of the combined section of the stiffener<br clear="none">
> > plus an effective length of the pressure boundary shell may be specified by<br clear="none">
> > design, but in any case is to be calculated in consideration of the minimum<br clear="none">
> > at the locations where any holes exist. Holes in the flange are far more<br clear="none">
> > detrimental than holes in the web, with the mininum impact hole being a<br clear="none">
> > hole which is coincident with the neutral axis across the combined section.<br clear="none">
> > (i.e. holes drilled in the center of the web of an I-beam have the least<br clear="none">
> > impact).<br clear="none">
> > ><br clear="none">
> > > Better than drilling holes would be to simply clamp to stiffener rings,<br clear="none">
> > or weld on brackets or studs such that no material is removed from the<br clear="none">
> > stiffener section. Otherwise you do have to account for the reduced moment<br clear="none">
> > of inertia of the stiffener section at the hole location in your buckling,<br clear="none">
> > inter-stiffener strength and stuffener tripping calculations.<br clear="none">
> > ><br clear="none">
> > > Sean<br clear="none">
> > ><br clear="none">
> > ><br clear="none">
> > > On September 7, 2017 6:51:03 AM PDT, Steve McQueen via<br clear="none">
> > 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">
> > > >All, as most probably know a K-250 has internal angle stiffeners (L).<br clear="none">
> > > ><br clear="none">
> > > >In my rebuild I have avoided drilling any holes in the web portion of<br clear="none">
> > > >these stiffeners (actually had some existing holes from the original<br clear="none">
> > > >build welded up/filled). However, I am finding it would be nice if I<br clear="none">
> > > >could drill a few small (1/4") holes to help mount some interior parts.<br clear="none">
> > > >I believe I am looking at 1 to 3 of these holes max. in any single<br clear="none">
> > > >stiffener web.<br clear="none">
> > > ><br clear="none">
> > > >Calculating any reduction in functional strength that might result from<br clear="none">
> > > >a few small holes isn't straight forward. I guess I am looking for<br clear="none">
> > > >some feedback from those who understand the web function of an L<br clear="none">
> > > >stiffener better than I.<br clear="none">
> > > ><br clear="none">
> > > >My guess is this wouldn't be a significant issue and I an being too<br clear="none">
> > > >anal.<br clear="none">
> > > ><br clear="none">
> > > >Thanks,<br clear="none">
> > > >Steve<br clear="none">
> > > >_______________________________________________<br clear="none">
> > > >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">
> > 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">
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