[PSUBS-MAILIST] Finishing O-ring groove

Fri Sep 8 23:38:14 EDT 2017

Thanks for the advice everyone.
Had another look at things & the cross slide was a little bit sloppy.
Tightened it up & got a much better finish. I still sanded it slightly.
I cut a section out of a coat hanger, bent it & hot glued on sand paper.
Worked well enough to finish the groove.
Alan

Sent from my iPad

> On 9/09/2017, at 2:23 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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.
>  
> Brian
>  
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Finishing O-ring groove
> Date: Sat, 9 Sep 2017 13:16:24 +1200
> 
> Thanks Hugh, it's ID groove.
> I have been cleaning up my OD grooves with sand paper, taking the
> sharp edge off the groove then finishing with 1200 grit to get a polished 
> surface. Not sure if this is the done thing! The OD grooves had less chatter.
> I have been setting the tool height to my dead centre in the tail stock; but
> might put a centre in the chuck to double check. Will have a look at moving
> the tool back as far as I can in the tool holder. 
> Any recommendations on a good anodiser? I did talk briefly to one who said
> I didn't necessarily need to have a hard anodising finish for  a marine 
> application. Only if it might be knocked around! I have 5 lights each in 3 
> sections, any idea of a ball park figure for what 15 pieces should cost me?
> Cheers Alan
> 
> 
> Sent from my iPad
> 
> On 9/09/2017, at 12:16 PM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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