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<div>I wouldn't call 0.003'' difference a failure on a taper with portable machining equipment !</div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757">Sent from my Samsung device</div></div><br><br>-------- Original message --------<br>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> <br>Date: 01-11-2016 8:25 PM (GMT-05:00) <br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br>Subject: Re: [PSUBS-MAILIST] taper fit up <br><br></div><br><div><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_1_1452558790184_11888"><span>Tom,</span></div><div id="yui_3_16_0_1_1452558790184_11886"><span id="yui_3_16_0_1_1452558790184_12054">Very good point, I honestly don't know how accurate it needs to be. I do not have a good machined fit, the bottom of the hatch is tight and the top has a .003 gap all the way around. When I started it was the other way around gap at the bottom and tight on top. I tried three times to match the angles and failed.</span></div><div id="yui_3_16_0_1_1452558790184_11886"><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 Monday, January 11, 2016 6:09 PM, Tom J Whent via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv9009690774"><style>#yiv9009690774 #yiv9009690774 --
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#yiv9009690774 </style><div><div class="yiv9009690774WordSection1"><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;">Indexing was a poor choice of words. Locating would be better – essentially something to keep both base circles concentric for fitting either for lapping or for mating together in the part’s final configuration. A lot of parts that I might make that have to align well might have a spigot on one half and a mating counterbore on the other.</span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;">For lapping, I would think some sort of centerline guide would be useful to keep the two halves in the correct position. Lapping might be overkill? After all it’s not a Swiss watch! If your machined fit is good and you are relying on a captive sealing element like an o-ring – I would hope you are not going deep enough to extrude it through a 3 thou gap!!! </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;">J</span><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;">I’m sorry if I wasn’t paying very close attention – I’m just lurking on this group and your boring machine really caught my attention. </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;">I’m building a non-submersible steel boat (hopefully!) right now and may one day move onto something like this.</span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;">Tom</span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv9009690774yqt2785881973" id="yiv9009690774yqt39160"><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><div class="yiv9009690774MsoNormal"><b><span style="font-size:11.0pt;">From:</span></b><span style="font-size:11.0pt;"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Private via Personal_Submersibles<br clear="none"><b>Sent:</b> Monday, January 11, 2016 7:42 PM<br clear="none"><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] taper fit up</span></div></div></div><div class="yiv9009690774MsoNormal"> </div><div><div class="yiv9009690774MsoNormal">Hank, if you're down to 0.003 isn't it just a matter of putting lapping compound between the hatch and land, and rotating the hatch a bunch of times? I know it's heavy, but maybe with a big lever you can walk around like an 18th century seaman turning a capstan. </div></div><div><div class="yiv9009690774MsoNormal"> </div></div><div><div class="yiv9009690774MsoNormal">Best,</div></div><div><div class="yiv9009690774MsoNormal"> </div></div><div><div class="yiv9009690774MsoNormal">Alec</div></div><div><div class="yiv9009690774MsoNormal"> </div></div><div><div class="yiv9009690774MsoNormal"> </div></div><div><div class="yiv9009690774MsoNormal" style="margin-bottom:12.0pt;"><br clear="none">On Jan 11, 2016, at 7:01 PM, hank pronk 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:</div></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;"><div><div><div id="yiv9009690774yui_3_16_0_1_1452556512829_2594"><div class="yiv9009690774MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Tom,</span></div></div><div id="yiv9009690774yui_3_16_0_1_1452556512829_2594"><div class="yiv9009690774MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Not sure what you mean about indexing. My original plan was to use the centre bore for the hatch release as a guide to rotate the hatch over the land with lapping compound. The problem with that idea is, the hatch has to make a few trips back to lathe and getting it back to the exact location is pretty tough. Then the centre is off a few thousandths. I am struggling with the final .003 I can't seem to get it closer. I think my lathe might be lacking the accuracy. I know,,,blame the tools ;-) </span></div></div><div id="yiv9009690774yui_3_16_0_1_1452556512829_2594"><div class="yiv9009690774MsoNormal" style="background:white;"><span style="font-size:9.0pt;">I need to sleep on it, I have the blueing on the way. If it was easy, everyone would be doing it.</span></div></div><div id="yiv9009690774yui_3_16_0_1_1452556512829_2594"><div class="yiv9009690774MsoNormal" style="background:white;"><span style="font-size:9.0pt;">Hank</span></div></div></div></div></blockquote><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;"><div><div class="yiv9009690774MsoNormal">_______________________________________________<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></div></div></blockquote></div></div>
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