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Re: [ATM] plate glass blanks
On Wed, 11 Jul 2007, horace r davis wrote:
>
> what is the largest mirror one can make from .94 inch thick plate glass
> commercial
> anneal
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>From real world experience, I happened to think on the 107 cm F/4.5
mirror just discussed on this list, and I posted a comment that the
thickness was only 5.6 cm. In other words, 107/5.6 gives a thickness
ratio of about 19:1 for a known, existing scope that I think we all
agree is stretching the limits (I know from first hand experience).
By comparison, 0.94 * 19 = 17.86, let's say 18". I have something
close to this dimension myself, but not completed yet. Grinding is
like always, figuring is a hassle.
Dominic-Luc Webb
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