<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym18_1_1458855782700_2833"><span>Alan,</span></div><div id="yui_3_16_0_ym18_1_1458855782700_2833"><span id="yui_3_16_0_ym18_1_1458855782700_3325">You will be glad you bolted it together, it will be a lot easier to machine . I am only in Holland for a few days then strait to Slovakia. </span></div><div id="yui_3_16_0_ym18_1_1458855782700_2833"><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Thursday, March 24, 2016 3:13 PM, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv9188381545"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv9188381545yui_3_16_0_1_1458852520769_3070"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3069">OK Hank I will bolt the front section on.</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3068"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3067">I had problems machining the bearing seat on the first thruster as the </span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3066"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3065">front section was one piece & I needed a long boring tool. I will have the </span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3060"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3059">same trouble if I have to machine these after welding. I will probably</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3064"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3063">loc-tite everything in on the front section as it doesn't need to come apart.</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3062"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3061">The whole thruster housing (2000W) is only 80mm x 174mm (3&1/4" X 7")</span></div><div dir="ltr"><span>& there is very little to it.</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3172"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3171">Are you planning any other submarine events in Europe apart from visiting Emile?</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3174"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3173">I went up to Cherbourg & had a look at the submarine museum. You could spend</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3176"><span id="yiv9188381545yui_3_16_0_1_1458852520769_3175">a day there, I am sure your wife would love it.</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_3170"><span>Cheers Alan</span></div><div class="yiv9188381545qtdSeparateBR" id="yiv9188381545yui_3_16_0_1_1458852520769_3058"><br clear="none"><br clear="none"></div><div class="yiv9188381545yahoo_quoted" id="yiv9188381545yui_3_16_0_1_1458852520769_2864" style="display:block;"> <div id="yiv9188381545yui_3_16_0_1_1458852520769_2863" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv9188381545yui_3_16_0_1_1458852520769_2862" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv9188381545yqt2295311881" id="yiv9188381545yqt99417"><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_2861"> <font id="yiv9188381545yui_3_16_0_1_1458852520769_2860" face="Arial" size="2"> </font><hr id="yiv9188381545yui_3_16_0_1_1458852520769_3169" size="1"> <b><span style="font-weight:bold;">From:</span></b> hank pronk 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> Friday, March 25, 2016 9:05 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster<br clear="none"> </div> <div class="yiv9188381545y_msg_container" id="yiv9188381545yui_3_16_0_1_1458852520769_2905"><br clear="none"><div id="yiv9188381545"><div id="yiv9188381545yui_3_16_0_1_1458852520769_2922"><div id="yiv9188381545yui_3_16_0_1_1458852520769_2921" style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255, 255, 255);"><div id="yiv9188381545yui_3_16_0_ym18_1_1458842677313_4585"><span>Alan,</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458842677313_4585"><span id="yiv9188381545yui_3_16_0_ym18_1_1458842677313_4735">I like the two seals also and now that you mention you are putting in a fill plug to vent air-I am with you. I would get it welded before you machine the </span>bearing seats etc, if possible.</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458842677313_4585">I would still make both ends bolt together-there is nothing like having it come apart to work on it. My Perry thrusters break down into a million pieces and it is real nice to work on.</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458842677313_4585">Hank</div> <div class="yiv9188381545qtdSeparateBR" id="yiv9188381545yui_3_16_0_1_1458852520769_3048"><br clear="none"><br clear="none"></div><div class="yiv9188381545yahoo_quoted" id="yiv9188381545yui_3_16_0_1_1458852520769_2926" style="display:block;"> <div id="yiv9188381545yui_3_16_0_1_1458852520769_2925" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div id="yiv9188381545yui_3_16_0_1_1458852520769_2924" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv9188381545yqt6908306307" id="yiv9188381545yqt45524"><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458852520769_2923"><font id="yiv9188381545yui_3_16_0_1_1458852520769_2927" face="Arial" size="2"> On Thursday, March 24, 2016 1:55 PM, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv9188381545y_msg_container" id="yiv9188381545yui_3_16_0_1_1458852520769_2930"><div id="yiv9188381545"><div id="yiv9188381545yui_3_16_0_1_1458852520769_2929"><div id="yiv9188381545yui_3_16_0_1_1458852520769_2928" 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="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2712"><span id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2769">Hank,</span></div><div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2710"><span id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2711">I left out some details on that drawing. The back end fits the same</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2758"><span id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2757">as the front & has a radial o-ring seal on the end housing & 6 cap screws that</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2789"><span>bolt in to the central housing. </span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2790"><span>Alan</span></div><div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2756"><span></span><br clear="none"></div><div class="yiv9188381545qtdSeparateBR" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2707"><br clear="none"><br clear="none"></div><div class="yiv9188381545yahoo_quoted" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2705" style="display:block;"> <div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2704" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2703" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv9188381545yqt3439157887" id="yiv9188381545yqt32133"><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2706"> <font id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2709" face="Arial" size="2"> </font><hr id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2708" size="1"> <b><span style="font-weight:bold;">From:</span></b> hank pronk 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> Friday, March 25, 2016 1:31 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster<br clear="none"> </div> <div class="yiv9188381545y_msg_container" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2702"><br clear="none"><div id="yiv9188381545"><div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2701"><div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2700" style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255, 255, 255);"><div id="yiv9188381545yui_3_16_0_1_1458822019452_3535"><span>Hi Alan,</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458822019452_3488"><span id="yiv9188381545yui_3_16_0_1_1458822019452_3487">It wouldn't hurt to clamp the end cap tight but you do have a nice shoulder for the end cap to sit on. Any time I make a part that can and usually does warp, I make it oversize and machine it true after welding. I am curious why you want to weld it-that big shoulder has room for an o-ring. I would also ditch the second seal-it is an air trap. Great project!</span></div><div dir="ltr" id="yiv9188381545yui_3_16_0_1_1458822019452_3488"><span>Hank</span></div> <div class="yiv9188381545qtdSeparateBR" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2800"><br clear="none"><br clear="none"></div><div class="yiv9188381545yahoo_quoted" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2699" style="display:block;"> <div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2698" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2697" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv9188381545yqt7524366994" id="yiv9188381545yqt52638"><div dir="ltr"><font face="Arial" size="2"> On Thursday, March 24, 2016 12:27 AM, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv9188381545y_msg_container" id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2696"><div id="yiv9188381545"><div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2695"><div id="yiv9188381545yui_3_16_0_ym18_1_1458848729393_2694" 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="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4233"> This is my latest brushless thruster design for scrutiny.</div><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4199">The last thruster I made was 2 piece with one seal.</div><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4332">I machined the last version out of aluminum rod, which was expensive & difficult.</div><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4331">The end pieces in this design are from solid rod but the mid section is from a stock tube</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4371">that I intend to have welded to the propeller end. The back end is bolted on.</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4334">Am I likely to get distortion when welding the two sections together? There is a sleeve</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4333">press fitting to help give it some rigidity for welding. Should I make a jig to clamp it in</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4367">for welding?</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4372">The thruster is for 500ft depth & is oil filled with a slight over pressure above ambient. </div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4490">Oil filled mainly for cooling purposes, but also as a secondary defense against any leaks,</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4555">& for lubrication of bearings & seals. I am using low pressure lip seals & have a double </div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4565">seal redundant arrangement. The outboard seal is orientated to keep the oil in & with the</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_4612">internal overpressure should keep the water out. The outboard seal should fail first as it is </div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5135">exposed to abrasives, especially in sea water. The inboard seal is oriented so that it keeps</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5246">any water out that may get past the outboard seal. </div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5265">The tube coming out of the seal cavity is for pressurizing it & for collecting any water that</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5247">may get through & come out of suspension. I am thinking of putting a water sensor in there.</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5383">Any comments welcome.</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5384">Alan</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5281">p.s. if image isn't big enough keep hitting ctrl & + TO ENLARGE.</div><div dir="ltr" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5112"><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5539"><br clear="none"></div><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5494" style="display:block;"><div class="yiv9188381545yahoo-compose-assist-image-card yiv9188381545ymail-preserve-class" id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5541" style="width:100%;"><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5540"><img id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5551" style="width:100%;vertical-align:middle;max-height:406px;max-width:800px;" alt="motor cut away.jpg" itemprop="contentUrl"></div></div></div><div id="yiv9188381545yui_3_16_0_ym18_1_1458793494416_5542"><br clear="none"></div></div></div></div></div><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"><br clear="none"></div></div> </div> </div> </div></div></div></div><br clear="none"><div class="yiv9188381545yqt7524366994" id="yiv9188381545yqt97447">_______________________________________________<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"></div><br clear="none"><br clear="none"></div></div> </div> </div> </div></div></div></div><br clear="none"><div class="yiv9188381545yqt3439157887" id="yiv9188381545yqt93739">_______________________________________________<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"></div><br clear="none"><br clear="none"></div></div> </div> </div> </div></div></div></div><br clear="none"><div class="yiv9188381545yqt6908306307" id="yiv9188381545yqt64903">_______________________________________________<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"></div><br clear="none"><br clear="none"></div></div> </div> </div> </div></div></div></div><br><div class="yqt2295311881" id="yqt66688">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>