[PSUBS-MAILIST] Finishing O-ring groove

[hank pronk via Personal_Submersibles]

 Alan,I use a flat file Hank
    On Friday, September 8, 2017, 3:21:54 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Thanks, Brian & James.
Unfortunately Brian I'm getting that little bit of chatter & I am
needing to sand them down. Am also sanding the mating
surfaces; finishing with 1200 grit & oil.
I had thought of the dremel James. Trouble is that for these
small grooves I would need the grinder on the dremel at the
same profile as the O-ring groove. 
I might try bending up a peice of wire & hot glueing on 
sand paper. 
Not a lot I've found about this while Googling!
Alan

Sent from my iPad

> On 9/09/2017, at 6:59 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,  Aluminum likes high speed when turning the part, aside from just breaking the edges, you shouldn't need to use sand paper. 
> 
> Brian
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: [PSUBS-MAILIST] Finishing O-ring groove
> Date: Fri, 8 Sep 2017 19:31:24 +1200
> 
> I have been finishing some internal O-ring grooves in aluminium on the lathe, 
> with sandpaper.
> The grooves are small; 3.4mm x 2mm. There was a bit of chatter after machining.
> I am wondering if there is a better way to finish them rather than folding up small
> bits of varying grades of sand paper & sticking my hand in the work. ( am being careful)
> Maybe an abrasive paste & a bent piece of wire of a similar diameter to the groove?
> The hole diameter is 60mm & the groove is only 4mm in from the face, but difficult
> to get a straight stick with sandpaper in to it on the correct angle. I have a few to do.
> Any suggestions thanks.
> Alan
> 
> Sent from my iPad
> 
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