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[ATM] Blank ratios for different materials.

Hi Guys,
 
>From my basic understanding of mirror grinding, it sounds like there is
a typical ratio of blank diameter to thickness that minimizes complexity
in polishing, figuring and mounting.
 
I think the ratio for a Pyrex blank is something like 6:1. Is that
correct?
 
And, what would be a good ratio for materials like plate glass, BVC and
Quartz?
 
Thanks,
 
-Anthony
Round Rock TX
 

 

 
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