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

[Hugues.Laroche at ses-astra.com (Hugues.Laroche@ses-astra.com)]

Hello Satish,

>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 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 ?

Yes, it is pretty frequent. If you are far from the
target sagitta (depth in the center), you may continue
as you did. If you are getting close, on the other hand,
you should switch to less agressive strokes and finer
grit (#80), MOT (mirror on top). More or less long center over
center strokes, or still reasonably off-center, as you
prefer. The surface erosion should then start to get
more equally spread.

Happy grinding!

Hugues





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