[PSUBS-MAILIST] Finishing O-ring groove

Sun Sep 10 21:43:42 EDT 2017

Thanks Steve,
that's good information & advice.
Can you get the aluminium screws out after the anodising
or do they become one with the surrounding anodising?
I have long bolts running through the 3 sections pulling
them all together & compressing O-rings. The bolts extend out
the back to mount an attachment bracket if needed. ( as in attached photo)
Do you think a stainless washer under the nuts that tighten this together 
would do the anodising any harm? I could look at using a thin fibre washer 
under the stainless washer.
Other than that I could get a quote on hard anodising.
Cheers Alan

Sent from my iPad

> On 11/09/2017, at 1:09 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Alan,
> In reference to your anodising - I use Collins Anodic in Melbourne, and I'd estimate about AU$150 for your 15 pieces.  I reckon the places in Auckland would be pretty similar.
> 
> I haven't bothered with hard anodising my caving lights and they get knocked around (and salt water immersed) and are ok.  Just be careful where you are screwing other metals in (ie. cable glands) because if they scrape off the anodising, corrosion will happen.
> 
> If you can be flexible on colour (black, blue, clear and gold are common) that will likely help keep the cost down.
> 
> They need to put a piece of wire on each piece to hang it in the anodising bath - which leaves a mark.  If you have tapped holes in your part and you can find some aluminium screws for them, the wire can go on that.  The screw hole isn't then very well anodised, so ideally it's on the inside.
> 
> Cheers,
> Steve
> 
>> On Sat, Sep 9, 2017 at 11:16 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 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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>>> 
>>> 
>>> > 
>>> > 
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