To: "DAVID K OESTREICH" 
Cc: atm{at}shore.net, owner-atm{at}shore.net
From: Hugues.Laroche{at}ses-astra.com
Reply-To: Hugues.Laroche{at}ses-astra.com



Guten Tag Karl,

>The problem is that the curve isn't all the way out to the edge.
>I would say the edge is roughly flat and about 1/4" wide or better.I was
>going to flip the mirror over and work with the mirror on the bottom and
>tool on top and proceed on with 120 grit (the next highest grit (started
>with 80 grit)).

Been there, done that. I think you are right to continue TOT (tool on top).

Before that, it is the right moment to check the mirror's bevel if not done yet.
Use chordal strokes at the beginning, then as the curve reaches the edge,
less and less agressive strokes to "spherize" (?) the surfaces.
After 2-3 wets of the grit following the 120 grit, check if the smoothing
proceeds uniformly over the surface. If it is more or less uniform
continue, else go back to 120 grit with gentle strokes to better mate the
surfaces.

Happy grinding,

Hugues Laroche
Luxembourg, Europe




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