[PSUBS-MAILIST] Finishing O-ring groove

[Hugh Fulton via Personal_Submersibles]

Alan,

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.

You should not have chatter if you are machining correctly. Is it an ID groove or an OD groove?  Hugh

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Saturday, 9 September 2017 9:58 AM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Finishing O-ring groove

 

Thanks Hank.

I couldn't get a file in to this internal groove & it may jam. 

About 2 & 1/2" diameter.

Will try my wire idea. I get there eventually doing it by hand

& folded sandpaper, but I'm considering doing another bunch

after this 4 & trying to find a better way.

Alan

Sent from my iPad


On 9/09/2017, at 9:43 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

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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