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Re: [ATM] thin but workable
Tony,
>With all this talk of ultra thin mirrors does anyone have guidelines for
>just how thin you can go without resorting to unusual support systems
>and grinding/polishing systems? I'm specifically interested in the 12.5"
>diameter case in pyrex.
It depends on your definition of "guidelines".
Support induced problems are additive to grinding & polishing induced
problems. You never know with certainty which one and to what extent
caused resulting figuring errors.
But test stand induced errors are on the best way to be analyzed, quantified
and understood thanks to work of Dale Eason ,Stephen Koehler and David
Davies.
This is just in progress and you can watch the show from the first row seats
provided by this wonderful list.
My guess is that it is not correct to expect a definite number,
like 1 to 6 diameter to thickness ratio, in order to be "sure".
There is a gray zone which depends on the skill of individual.
How wide and where is this zone depends also on skill.
So the answer is function of the skill^2 (at least).
Regards
Vladimir.
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