<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym18_1_1458857069959_3054"><span>Hi Steve,</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3122"><span id="yui_3_16_0_ym18_1_1458857069959_3121">sorry, I left a bit of detail out of that drawing.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3265"><span id="yui_3_16_0_ym18_1_1458857069959_3264">Firstly the motor is an outrunner; so the back section with wires coming out is stationary</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3263" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3262">as are the coils inside, but the rest of the can, with magnets, rotates.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3088" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3087">The motor has a thrust bearing in it, and that takes the forward load from the propeller.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3076" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3086">There will be a circlip on the propeller shaft that will run against the bearing shown,</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3151" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3150">when in reverse. The motor comes with 4 threaded holes in the back for mounting.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3188" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3187">I am putting 4 pins in these that will locate in 4 holes in the rear section of the thruster</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3286" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3285">housing. The pins will only centralize the motor & stop the back section of the motor </span></div><div id="yui_3_16_0_ym18_1_1458857069959_3284" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3283">rotating. The whole motor could move laterally on the pins when going from forward to reverse</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3422" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3421">but with a tight tolerance this shouldn't be a problem.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3441" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3581"> I am replacing the propeller shaft with 316 SS as I did in the last version. The factory that</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3580" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3582">supplied the motor kindly sent it disassembled to facilitate this. They normally Loctite everything.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3574" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3573"> The wiring tube takes the 3 phase wires + 6 hall sensor & 2 heat sensor wires. I may add</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3617" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3616">a water sensor in the bottom tube. The wires in the last version came out through a hose</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3619" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3618">connector fitting that was press fitted in with Loctite and had a clear plastic hose clamped to it. </span></div><div id="yui_3_16_0_ym18_1_1458857069959_3314" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3676">I like this, as the oil for compensation also runs in it & the clear hose is a level indicator. </span></div><div id="yui_3_16_0_ym18_1_1458857069959_3743" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3767">I will send the wiring </span><span id="yui_3_16_0_ym18_1_1458857069959_3744">through a penetrator at the hull.</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3769" dir="ltr"><span id="yui_3_16_0_ym18_1_1458857069959_3808">Cheers Alan</span></div><div id="yui_3_16_0_ym18_1_1458857069959_3103" dir="ltr"><span></span><br></div><div class="qtdSeparateBR" id="yui_3_16_0_ym18_1_1458857069959_2980"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym18_1_1458857069959_2984" style="display: block;"> <div id="yui_3_16_0_ym18_1_1458857069959_2983" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1458857069959_2982" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1458857069959_2981" dir="ltr"> <font id="yui_3_16_0_ym18_1_1458857069959_2986" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym18_1_1458857069959_3123"> <b id="yui_3_16_0_ym18_1_1458857069959_3149"><span id="yui_3_16_0_ym18_1_1458857069959_3148" style="font-weight: bold;">From:</span></b> Stephen Fordyce 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 id="yui_3_16_0_ym18_1_1458857069959_3125"><span id="yui_3_16_0_ym18_1_1458857069959_3124" style="font-weight: bold;">Sent:</span></b> Friday, March 25, 2016 11:06 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym18_1_1458857069959_3108"><br><div id="yiv6528953020"><div id="yui_3_16_0_ym18_1_1458857069959_3111"><div id="yui_3_16_0_ym18_1_1458857069959_3110" dir="ltr"><div id="yui_3_16_0_ym18_1_1458857069959_3109">Hi Alan,</div><div id="yui_3_16_0_ym18_1_1458857069959_3452">That looks great! Very small for the power. A couple of comments/queries:</div><div id="yui_3_16_0_ym18_1_1458857069959_3451">- There's no second bearing or thrust bearing - perhaps these are not shown?</div><div id="yui_3_16_0_ym18_1_1458857069959_3461">- Just wondering how the wiring tube is connected? Ie. tapped hole for a cable gland or compression fitting?</div><div>- How is the motor held in place within the housing?</div><div>- I'm guessing the motor has a carbon steel shaft and the external propeller shaft should be SS316 - are you going to weld them together or connect mechanically?</div><div><br clear="none"></div><div>Cheers,</div><div>Steve</div></div><div class="yiv6528953020gmail_extra" id="yui_3_16_0_ym18_1_1458857069959_3464"><br clear="none"><div class="yiv6528953020gmail_quote">On Fri, Mar 25, 2016 at 8:13 AM, Alan James via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote class="yiv6528953020gmail_quote" style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><div class="yiv6528953020yqt5582950126" id="yiv6528953020yqt71257"><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><span>OK Hank I will bolt the front section on.</span></div><div dir="ltr"><span>I had problems machining the bearing seat on the first thruster as the </span></div><div dir="ltr"><span>front section was one piece & I needed a long boring tool. I will have the </span></div><div dir="ltr"><span>same trouble if I have to machine these after welding. I will probably</span></div><div dir="ltr"><span>loc-tite everything in on the front section as it doesn't need to come apart.</span></div><div dir="ltr"><span>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"><span>Are you planning any other submarine events in Europe apart from visiting Emile?</span></div><div dir="ltr"><span>I went up to Cherbourg & had a look at the submarine museum. You could spend</span></div><div dir="ltr"><span>a day there, I am sure your wife would love it.</span></div><div dir="ltr"><span>Cheers Alan</span></div><div><br clear="none"><br clear="none"></div><div style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font face="Arial" size="2"><span> </span></font><hr size="1"> <b><span style="font-weight: bold;">From:</span></b> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight: bold;">Sent:</span></b> Friday, March 25, 2016 9:05 AM<div><div class="yiv6528953020h5"><br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster<br clear="none"> </div></div> </div><div><div class="yiv6528953020h5"> <div><br clear="none"><div><div><div 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><span>Alan,</span></div><div dir="ltr"><span>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">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">Hank</div> <div><br clear="none"><br clear="none"></div><div 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><div dir="ltr"><font face="Arial" size="2"> On Thursday, March 24, 2016 1:55 PM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div><div><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><span>Hank,</span></div><div><span>I left out some details on that drawing. The back end fits the same</span></div><div dir="ltr"><span>as the front & has a radial o-ring seal on the end housing & 6 cap screws that</span></div><div dir="ltr"><span>bolt in to the central housing. </span></div><div dir="ltr"><span>Alan</span></div><div><span></span><br clear="none"></div><div><br clear="none"><br clear="none"></div><div style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div><div dir="ltr"> <font face="Arial" size="2"> </font><hr size="1"> <b><span style="font-weight: bold;">From:</span></b> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <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><br clear="none"><div><div><div 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><span>Hi Alan,</span></div><div dir="ltr"><span>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"><span>Hank</span></div> <div><br clear="none"><br clear="none"></div><div 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><div dir="ltr"><font face="Arial" size="2"> On Thursday, March 24, 2016 12:27 AM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div><div><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> This is my latest brushless thruster design for scrutiny.</div><div>The last thruster I made was 2 piece with one seal.</div><div>I machined the last version out of aluminum rod, which was expensive & difficult.</div><div>The end pieces in this design are from solid rod but the mid section is from a stock tube</div><div dir="ltr">that I intend to have welded to the propeller end. The back end is bolted on.</div><div dir="ltr">Am I likely to get distortion when welding the two sections together? There is a sleeve</div><div dir="ltr">press fitting to help give it some rigidity for welding. Should I make a jig to clamp it in</div><div dir="ltr">for welding?</div><div dir="ltr">The thruster is for 500ft depth & is oil filled with a slight over pressure above ambient. </div><div dir="ltr">Oil filled mainly for cooling purposes, but also as a secondary defense against any leaks,</div><div dir="ltr">& for lubrication of bearings & seals. I am using low pressure lip seals & have a double </div><div dir="ltr">seal redundant arrangement. The outboard seal is orientated to keep the oil in & with the</div><div dir="ltr">internal overpressure should keep the water out. The outboard seal should fail first as it is </div><div dir="ltr">exposed to abrasives, especially in sea water. The inboard seal is oriented so that it keeps</div><div dir="ltr">any water out that may get past the outboard seal. </div><div dir="ltr">The tube coming out of the seal cavity is for pressurizing it & for collecting any water that</div><div dir="ltr">may get through & come out of suspension. I am thinking of putting a water sensor in there.</div><div dir="ltr">Any comments welcome.</div><div dir="ltr">Alan</div><div dir="ltr">p.s. if image isn't big enough keep hitting ctrl & + TO ENLARGE.</div><div dir="ltr"><div><br clear="none"></div><div style="display: block;"><div style="width: 100%;"><div><img style="width: 100%; vertical-align: middle; max-height: 406px; max-width: 800px;" alt="motor cut away.jpg" data-id="9a42a1e6-15cc-2d2e-7494-d9ab4ff89bf1"></div></div></div><div><br clear="none"></div></div></div></div></div><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">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>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">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>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">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>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">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></div><br clear="none">_______________________________________________<br clear="none">
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