Re: [ATM] Flat grinding the back of the primary mirror

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> Does this also apply to float-glass blanks?
> Float-glass is made in very large sheets, and the thickness accuracy
> usually is pretty good.

I've ground a number of very thin porthole blanks (soda lime glass or float
glass).  The backs have always come flat and polished, so I've never had to
retouch the back side.

Mel Bartels


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