From: "Russell Jocoy" 
To: atm{at}shore.net
Reply-To: "Russell Jocoy" 


("atm{at}shore.net")

    O.K. you edler mirror makers how far can you go with a 3/4" plate glass
blank???
    Is 16" too big?? even at f6..??
     Is 14" too big?? at f5     so on , so on.  I have a table top
30"x69"
by 3/4" nice green plate glass
and I want to push the limit. I know It's really thin, ..so is my wallet.
Experimentation situation, come on
guys I need some input.. I am presently grinding two mirrors, one at
9"x 5/8" plate and the other at
10"x5/8" plate. Both are at 15micron now and as far as I can see
they are spherical and comming along nicely. I know I need  to finish these
before I proceed to the 3/4" but the glass says it doen't want to be a
table top any more. (I have checked the glass with polirized filters on the
rotation and the sweep and
there is no stress to the naked eye)  I have also scored the surface with a
carbide scriber and you can write
your name on the surface easily.  How big can I go???? Is 16" too big at f6
???

RUSS JOCOY
("atm{at}shore.net")





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