<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks Hugh, it's ID groove.</div><div>I have been cleaning up my OD grooves with sand paper, taking the</div><div>sharp edge off the groove then finishing with 1200 grit to get a polished </div><div>surface. Not sure if this is the done thing! The OD grooves had less chatter.</div><div>I have been setting the tool height to my dead centre in the tail stock; but</div><div>might put a centre in the chuck to double check. Will have a look at moving</div><div>the tool back as far as I can in the tool holder. </div><div>Any recommendations on a good anodiser? I did talk briefly to one who said</div><div>I didn't necessarily need to have a hard anodising finish for a marine </div><div>application. Only if it might be knocked around! I have 5 lights each in 3 </div><div>sections, any idea of a ball park figure for what 15 pieces should cost me?</div><div>Cheers Alan</div><div><br></div><div><br><div>Sent from my iPad</div></div><div><br>On 9/09/2017, at 12:16 PM, Hugh Fulton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Helvetica Neue";}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--><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 [<a href="mailto:personal_submersibles-bounces@psubs.org">mailto:personal_submersibles-bounces@psubs.org</a>] <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></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>