<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Brian,</div><div id="AppleMailSignature">yes aluminium. </div><div id="AppleMailSignature">Alan <br><br>Sent from my iPad</div><div><br>On 25/11/2017, at 1:35 PM, Brian Cox 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:Arial, sans-serif; font-size:10pt;"><div>Alan, What kind of material are you using aluminum ? Steel?</div><div> </div><div>Brian<br><br>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] motor pod solution<br>Date: Sat, 25 Nov 2017 13:21:23 +1300<br><br></div><div>Brian,</div><div>my latest thruster design is in 3 sections; a front section housing the mechanical</div><div>seal & a bearing, the back section housing a bearing & the wiring port, & a central</div><div>tubular section. The front & back sections have an o-ring groove & o-ring for sealing</div><div>on assembly. The 3 sections will be press fitted together then drilled,tapped & </div><div>screwed. With the press fit I am regarding the central section as disposable as I</div><div>would probably have to cut in to it to part the sections. </div><div>Cheers Alan<br><br>Sent from my iPad</div><div><br>On 25/11/2017, at 12:27 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div style="font-family: Arial, sans-serif; font-size: 10pt;"><div>Hi All, Been wrestling with my motor pods ! The way I decided to mate the two end caps to my motor casing was not the ideal method. In fact I don't even remember ever seeing an arrangement like what I have. I'm squeezing a 1/4" o ring between two 1/4" pieces of pipe and then have side rings inside and out to keep the o ring from expanding out of that area. Surprisingly it has worked, probably only because there is next to zero pressure. So not wanting to invite a bad situation of oil leaking into the ocean I decided I need to have a proper sealing scheme. So that was going to mean I do a hatch style sealing arrangement with 14" dia stainless steel rings and a o ring groove etc.. So getting quotes on everything is was beginning to really add up , especially because the 14" pipe is just too big for my lathe , which means I would have to farm that part out ! The rings themselves were gong to be $600 for each motor pod ! So What I think I'm going to do is to just weld a 1/4" flat ring on both sides ( end cap and casing) regular steel, put them together and then just weld a bead around edge and seal it that way. Then if I need to get in there I will just grind off the bead and open it that way. It will also be rather easy to weld it back together where I previously ground out the weld on that lip. </div><div> </div><div>Brian</div></div></div></blockquote><blockquote><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>_______________________________________________
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