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[ATM] Polishing action
Hi all. I am an ATMer in New Zealand, and I've made a couple of mirrors over the years.
I have a question about the action of polishing a mirror.
It seems clear that the polishing action near the center of a mirror would be faster than near the outside, since for about
50% of the time, the outside edge of the mirror would be overhanging the tool, and thus not being polished. This intuition is
born out by the fact that when first polishing a mirror, the center generally polishes first, followed by the center. (at least
when polishing Mirror on Top).
My question is why this uneven polishing action doesn't always cause a severe turned up edge? It seems reasonable that if the edge
of the mirror is only getting 50% of the time in contact with the pitch (compared to the more central areas), it should polish at about
half the rate. But strangely, a turned up edge is very rare. Why?
Thanks
Dave Clark
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