To: "Jerry B. Hillman" 
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



Hello Jerry,

>Please look at the last Ronchi image on this page taken outside of ROC.
>I am assuming, perhaps incorrectly, that the reason the lines hook so
>sharply is that the edge is severely turned.

Yes, it is still a bit turned, but I have seen worse.

Also, from the inside ROC pic, the 1/2 center seems a little more corrected
than the half outside ring (edge excluded). Nothing dramatic though.

>Do I need to go back to fine grinding to fix this edge,

No!!

Maybe you make some wrong motion and/or hand pressure.

I am precisely reducing a TDE, working with a 4/5 lap, short Ws with
pressure with the hand that is near the edge of the tool, nearly no
overhang. The TDE is severe so progress is slow.

Yesterday evening I went to the extreme solution of polishing near the edge
with my thumb and that works! Be careful if you apply that, you can as well
generate a nasty zone inside the region worked on (did once this kind of
thing on a larger mirror, and THERE I finally went back to fine grinding in
despair).

As always, don't take my talk as the bible, listen to ALL the advises and
make your mind...

Good luck

Hugues Laroche




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