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Re: [ATM] Polishing speed
Yes, *please* enlighten us!
On Tue, 17 Jan 2006, Mike Lockwood wrote:
> Mel,
>
> Mel Bartels wrote:
>> BTW, 8-10 hours is way too long. You should be able to polish out a 6 inch
>> in an hour, two at most.
>> For more on what might actually happen during polishing (not figuring) and
>> why more pressure is better, see
>> http://www.bbastrodesigns.com/tm/chemical_mechanical_polishing.html
>
> Could you say more about fast polishing techniques? I've made many 6"
> mirrors and even with lots of pressure, I have never been able to
> declare them polished in under 6 hours.
>
> And that's not dry polishing - it's plenty wet, and with a fair amount
> of cerium in the solution - not dilute. Fine grinding was with 5u
> MicroGrit.
>
> Your polishing article mentions that polish rates increase linearly
> with velocity and pressure, and that more cerium particles in the lap
> is good. Your other articles on mirror making mention slow,
> deliberate polishing strokes. If the concentration and speed are
> good, this suggests using many times more pressure than I am
> physically capable of applying.
>
> Where's the discrepancy?
>
> Mike Lockwood
>
>
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