<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Alan,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Post a picture/photo of how you are machining and your setup and then we can solve it. Tool height is critical as is tool and work rigidity.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You should not have chatter if you are machining correctly. Is it an ID groove or an OD groove? Hugh<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan via Personal_Submersibles<br><b>Sent:</b> Saturday, 9 September 2017 9:58 AM<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> Re: [PSUBS-MAILIST] Finishing O-ring groove<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Thanks Hank.<o:p></o:p></p></div><div id=AppleMailSignature><p class=MsoNormal>I couldn't get a file in to this internal groove & it may jam. <o:p></o:p></p></div><div id=AppleMailSignature><p class=MsoNormal>About 2 & 1/2" diameter.<o:p></o:p></p></div><div id=AppleMailSignature><p class=MsoNormal>Will try my wire idea. I get there eventually doing it by hand<o:p></o:p></p></div><div id=AppleMailSignature><p class=MsoNormal>& folded sandpaper, but I'm considering doing another bunch<o:p></o:p></p></div><div id=AppleMailSignature><p class=MsoNormal>after this 4 & trying to find a better way.<o:p></o:p></p></div><div id=AppleMailSignature><p class=MsoNormal>Alan<br><br>Sent from my iPad<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><br>On 9/09/2017, at 9:43 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue"'>Alan,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue"'>I use a flat file <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue"'>Hank<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue"'><o:p> </o:p></span></p></div><div id="yahoo_quoted_5148835985"><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>On Friday, September 8, 2017, 3:21:54 PM MDT, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote: <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'><o:p> </o:p></span></p></div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>Thanks, Brian & James.<br>Unfortunately Brian I'm getting that little bit of chatter & I am<br>needing to sand them down. Am also sanding the mating<br>surfaces; finishing with 1200 grit & oil.<br>I had thought of the dremel James. Trouble is that for these<br>small grooves I would need the grinder on the dremel at the<br>same profile as the O-ring groove. <br>I might try bending up a peice of wire & hot glueing on <br>sand paper. <br>Not a lot I've found about this while Googling!<br>Alan<br><br>Sent from my iPad<br><br>> On 9/09/2017, at 6:59 AM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>> <br>> Alan, Aluminum likes high speed when turning the part, aside from just breaking the edges, you shouldn't need to use sand paper. <br>> <br>> Brian<br>> <br>> --- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br>> <br>> From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>> Subject: [PSUBS-MAILIST] Finishing O-ring groove<br>> Date: Fri, 8 Sep 2017 19:31:24 +1200<br>> <br>> I have been finishing some internal O-ring grooves in aluminium on the lathe, <br>> with sandpaper.<br>> The grooves are small; 3.4mm x 2mm. There was a bit of chatter after machining.<br>> I am wondering if there is a better way to finish them rather than folding up small<br>> bits of varying grades of sand paper & sticking my hand in the work. ( am being careful)<br>> Maybe an abrasive paste & a bent piece of wire of a similar diameter to the groove?<br>> The hole diameter is 60mm & the groove is only 4mm in from the face, but difficult<br>> to get a straight stick with sandpaper in to it on the correct angle. I have a few to do.<br>> Any suggestions thanks.<br>> Alan<br>> <br>> Sent from my iPad<br>> <br>> _______________________________________________<br>> Personal_Submersibles mailing list<br>> <a 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><o:p></o:p></span></p><div id=yqtfd84983><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'><br>> <br>> <br>> _______________________________________________<br>> Personal_Submersibles mailing list<br>> <a 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 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><o:p></o:p></span></p></div></div></div></div></div></div></div></blockquote><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><o:p></o:p></p></div></blockquote></div></body></html>