<div dir="ltr"><div>I used a dremmel once to repair an O ring groove that I damaged. It couldn't be put back in the lathe and running something like this around fixed it a treat. (It was only a tiny score but stopped the </div><div><br></div><div>You could get the dremmel in and just hold it in the groove with the lathe on really slow speed. </div><div><br></div><div>just a thought.</div><div><br></div><div><img width="376" height="211" src="cid:ii_j7buqpnz0_15e61711e562bd8f"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 8 September 2017 at 08:31, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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>
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