[PSUBS-MAILIST] Finishing O-ring groove

Sun Sep 10 21:52:00 EDT 2017

Hi Alan,
Yes I believe the screws can come out afterwards (I haven't actually tried
it - but that's what my anodiser suggested last time after I pointed out
the marks).

I reckon the SS washers would be ok against the anodised ally but you may
as well use some fibre washers if easily available.

I think the hard anodising is just a thicker layer of oxide - ie. it's not
much more expensive, just takes a little longer and is just a bit harder to
scratch/ding.

Cheers,
Steve

On Mon, Sep 11, 2017 at 11:43 AM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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
> [image: image1.JPG]
>
> 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 <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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