[ATM] Rough grinding 8" Mirror spreading the curve...

[asatsi at yahoo.com (Satish K. Pagare)]

Hi All,

I did around one hour of grinding(#60 SiC) with the 
glass tile tool for my 8". I see there is a depression
forming already at the center of the glass blank. 
I can slip through a one Rupee coin(Indian Rupee)
through the depression. I guess it will be of the
thickness of USA One Quarter. I am seeing that there
is an outer ring on the glass blank, around a couple
of centimeters towards the edge which is still flat.
Not roughened up yet. Is this expected ? After one
hour of grinding the curve is still not spread till
the edges. Am I doing anything wrong here? Or do I
have to wait for the curve to be spread till the 
edges?

Thanks in advance,
Satish/
My ATM Blog:- 
http://www.geocities.com/asatsi/atm/atm.html

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