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[ATM] Astigmatism

Hi guys,

I would like to ask if you have any experiences with machine grinding of 
thin mirrors. I try to get into that for a while and I have problems 
with astigmatism when creating bigger diameters (16", 1" thin 
borofloat). I read somewhere that it is not possible to use machine for 
thin mirrors. Can anyone confirm that?

Can you explain the mechanism how the mirror start to be affected by 
astigmatism when a machine grinding is used? And, whats more important, 
how it can be prevented?

I have to say that my machine has only one excentr. I use full size lap, 
TOT, 1/3 strokes. I parabolize 1/3 and 1/2 polish lap, TOT, W strokes.

Thanks,
Libor
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