<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks for the advice everyone.</div><div id="AppleMailSignature">Had another look at things & the cross slide was a little bit sloppy.</div><div id="AppleMailSignature">Tightened it up & got a much better finish. I still sanded it slightly.</div><div id="AppleMailSignature">I cut a section out of a coat hanger, bent it & hot glued on sand paper.</div><div id="AppleMailSignature">Worked well enough to finish the groove.</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 9/09/2017, at 2:23 PM, Brian Cox 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="font-family:Arial, sans-serif; font-size:10pt;"><div>Alan, If you're just using aluminum it might be worth it to just start over. Make sure your tool is centered , try practicing on a another part you don't care about, If you change your angle of attack and run at a very high speed ( I don't think you can go too fast with aluminum), also use coolant. Your O ring groove should be perfectly smooth just using the tool. Could be the rake is not right for what you're trying to do.</div><div> </div><div>Brian</div><div> </div><div><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: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] Finishing O-ring groove<br>Date: Sat, 9 Sep 2017 13:16:24 +1200<br><br></div><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><div><div><p><span style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Alan,</span></p></div><p><span style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">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.</span></p></div><p><span style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">You should not have chatter if you are machining correctly. Is it an ID groove or an OD groove? Hugh</span></p><p><span style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></span> </p><div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0cm 0cm;"></div></div><p></p><p><b><span lang="EN-US" style="font-family: "Tahoma","sans-serif"; font-size: 10pt;">From:</span></b><span lang="EN-US" style="font-family: "Tahoma","sans-serif"; font-size: 10pt;"> 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</span></p><p> </p><div></div><div></div><p></p><p>Thanks Hank.</p><div></div><div></div><p></p><p>I couldn't get a file in to this internal groove & it may jam. </p><div></div><div></div><p></p><p>About 2 & 1/2" diameter.</p><div></div><div></div><p></p><p>Will try my wire idea. I get there eventually doing it by hand</p><div></div><div></div><p></p><p>& folded sandpaper, but I'm considering doing another bunch</p><div></div><div></div><p></p><p>after this 4 & trying to find a better way.</p><div></div><div></div><p></p><p>Alan<br><br>Sent from my iPad</p><div></div><div></div><p></p><p style="margin-bottom: 12pt;"><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:</p><div></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt;"><div><div><div></div></div></div></blockquote><p></p><p><span style="font-family: "Helvetica Neue"; font-size: 10pt;">Alan,</span></p><div></div><p></p><p><span style="font-family: "Helvetica Neue"; font-size: 10pt;">I use a flat file </span></p><div></div><p></p><p><span style="font-family: "Helvetica Neue"; font-size: 10pt;">Hank</span></p><div></div><p></p><p><span style="font-family: "Helvetica Neue"; font-size: 10pt;"></span> </p><div><div><div></div></div></div><p></p><p><span style="color: rgb(38, 40, 42); font-family: "Helvetica Neue"; font-size: 10pt;">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: </span></p><div></div><p></p><p><span style="color: rgb(38, 40, 42); font-family: "Helvetica Neue"; font-size: 10pt;"></span> </p><div></div><p></p><p><span style="color: rgb(38, 40, 42); font-family: "Helvetica Neue"; font-size: 10pt;"></span> </p><div><div></div></div><p></p><p><span style="color: rgb(38, 40, 42); font-family: "Helvetica Neue"; font-size: 10pt;">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">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></p><div></div><p></p><p><span style="color: rgb(38, 40, 42); font-family: "Helvetica Neue"; font-size: 10pt;"><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">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">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span></p></blockquote><blockquote style="margin-top: 5pt; margin-bottom: 5pt;"><div><p>_______________________________________________<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></p></div><div></div></blockquote></div><blockquote><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>_______________________________________________
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