<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>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><br></div><div>Best,</div><div><br></div><div>Alec</div><div><br></div><div><br></div><div><br>On Jan 11, 2016, at 7:01 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="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_1452556512829_2594">Tom,</div><div id="yui_3_16_0_1_1452556512829_2594">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 ;-) </div><div id="yui_3_16_0_1_1452556512829_2594" dir="ltr">I need to sleep on it, I have the blueing on the way. If it was easy, everyone would be doing it.</div><div id="yui_3_16_0_1_1452556512829_2594" dir="ltr">Hank</div></div></div></blockquote><blockquote type="cite"><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></body></html>