[PSUBS-MAILIST] O-ring groove machining

Sat Feb 25 19:01:40 EST 2017

Yes, but I meant "ridiculous" in a good way!

On Sat, Feb 25, 2017 at 6:48 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,
> you can just drive those 100w lights at a lower amperage.
> On my controller it is a matter of turning a trim pot.
> I intend to use the same light & emitter for my navigation
> lights by attaching a coloured acrylic hemisphere with holes
> in it over the pressure lens, & turning down the power.
> Alan
>
>
> Sent from my iPad
>
> On 26/02/2017, at 9:56 AM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> As a matter of fact I just came inside to have a coffee and get off my
> feet for ten minutes because I'm making the Cliff lights right now. They're
> uber cool, and I think you could use them as a mallet they're so strong. I
> have not of course got to the point where I can test them, but I expect
> we'll all be diving in sunglasses. My first pair of lights are the 5K
> model, but I ended up with 10K Bridgeluxes by mistake so I'm going to have
> to make another pair. Perhaps the 10Ks looking forward and the 5Ks sideways
> for peripheral vision. To get an idea how ridiculous that would be,
> consider it's five times Snoopy's lumens.
>
> BTW for the inside polishing you can use sandpaper and a stick. Be careful
> though.
>
>
> Best,
>
> Alec
>
>
>
> On Sat, Feb 25, 2017 at 3:38 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Good idea Alec,
>> you are turning your lathe in to a linisher.
>> I am making my light housing at the moment, & a couple of these
>> grooves are fiddly little internal grooves, that I need to get in to by
>> hand
>> but the sandpaper idea will be good for external work.
>>  I see you are down as machinist for Cliff's light housing. Have you done
>> that yet?
>> Alan
>>
>>
>> Sent from my iPad
>>
>> On 26/02/2017, at 1:42 AM, Alec Smyth via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Hi Alan,
>>
>> I'm referring to this stuff: https://www.mcmaster.co
>> m/#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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>>>
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