[PSUBS-MAILIST] O-ring groove machining

[Alec Smyth via Personal_Submersibles]

Hi Alan,

I'm referring to this stuff:
https://www.mcmaster.com/#standard-sanding-rolls/=16i9o51

It's the same as regular sandpaper except it comes in long rolls. You just
tear off say 2 feet of it. Pass it around the back of the piece you've just
machined on the lathe. Start the lathe and work the strip back and forth
while holding onto both ends of the strip. Spray with coolant for a
smoother polish - That's it!


Best,

Alec

On Fri, Feb 24, 2017 at 10:46 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Alec,
> not quite following you. Do you mean cutting a strip of sandpaper
> & rolling it length ways & taping it? I have just been using my hands
> if it seems safe enough. Did lose a finger one time but not on a lathe :)
> Alan
>
> Sent from my iPad
>
> On 25/02/2017, at 4:19 PM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Alan,
>
> Get yourself some rolls of sandpaper. Not sheets but rolls, about an inch
> wide. When you're done turning your piece, crank up the speed a bit and put
> a length of tape around it. It allows you to polish it up while keeping
> your hands away. Go to your fine tape and then spray with coolant for the
> final polish. I can't think of anything I turn on a lathe that I don't use
> tape on. Ah, the only exception is plastic.
>
>
> Best,
>
> Alec
>
> On Fri, Feb 24, 2017 at 8:52 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Thanks Brian & Hank,
>> it was the outer egdes that I left sharp.
>> It didn't cut nicely, it left a raised mound on the edge that I removed
>> with a facing tool.
>> I will either look  in to a specific groove tool or better equipment for
>> forming the
>> tool as these are taking too long :(
>> Alan
>>
>> Sent from my iPad
>>
>> > On 25/02/2017, at 1:49 PM, Brian Cox via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>> >
>> >
>> > Don't need carbide for aluminum, did it cut nicely, aluminum likes high
>> speed
>> >
>> > 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] O-ring groove machining
>> > Date: Sat, 25 Feb 2017 12:41:39 +1300
>> >
>> > Am cutting some small o-ring grooves in aluminum, 3.4mm x 2mm deep for
>> > a 2.5mm D o-ring. ( 10th of an inch) What is the best way to remove the
>> sharp
>> > corners of the grove? I have read that you can spin your work in the
>> lathe
>> > & sand with 200 & then 400 grit sand paper. Is this right?
>> > Have been having fun making the tool for this & don't think I have done
>> a
>> > good job! Am I best to buy a carbide tool specific for this job.
>> > Thanks, Alan
>> >
>> > Sent from my iPad
>> >
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