<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_1_1487983149734_15506"><span>Alan,</span></div><div id="yui_3_16_0_1_1487983149734_15506" dir="ltr"><span id="yui_3_16_0_1_1487983149734_15654">Are you talking about the edge on top of the groove, or the bottom radius. I use a file first then wet sand paper. With Aluminum, the sand paper will do it all. If you are talking the bottom radius, I grind my tool ( parting tool) with the radius in it.</span></div><div id="yui_3_16_0_1_1487983149734_15506" dir="ltr"><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 Friday, February 24, 2017 5:41 PM, Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><br>Hi Alan, you can use a tiny file, but be careful it doesn't kick back at you.<br><br>--- <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>Subject: [PSUBS-MAILIST] O-ring groove machining<br>Date: Sat, 25 Feb 2017 12:41:39 +1300<br><br>Am cutting some small o-ring grooves in aluminum, 3.4mm x 2mm deep for<br>a 2.5mm D o-ring. ( 10th of an inch) What is the best way to remove the sharp <br>corners of the grove? I have read that you can spin your work in the lathe<br>& sand with 200 & then 400 grit sand paper. Is this right?<br>Have been having fun making the tool for this & don't think I have done a <br>good job! Am I best to buy a carbide tool specific for this job.<br>Thanks, Alan<br><br>Sent from my iPad<br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></body></html>