From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 


Does the Foucault help in seeing this hill and does it suggest how to
concentrate the strokes?

IMHO, the ronchi is great for checking the edge and for smoothness, but I
rely on the foucault to get a feel for the high/low zones.

-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of Jerry
B. Hillman
Sent: Friday, January 17, 2003 6:30 PM To: atm{at}shore.net
Subject: ATM Fw: central hill




----- Original Message -----
From: COLJA, Mike 
To: 
Sent: Thursday, January 16, 2003 9:50 PM


> JBHillman
> good day,
>
> Sorry to bother you, but you provided some good advice regarding the
proper
> support for a 3/4" thick 10" f7 sometime ago.
> I have tried to post to the list but don't seem to be getting any replies.
> My question is what stroke to use to get rid of a shallow hill on my
mirror.
> At present I have 44 hours polishing, and the surface is getting to the
> point where a powerful red laser pointer's reflection is hard to see, even
> in the dark-
> so it is close to being polished out, but the ronchi bands pinch together
at
> the center (inside ROC) and ouside, with 3 bands showing, the center band
> actually forms a ring about 25% of the diameter!
>
> thanking you in advance,
> Mike Colja
>

--- BBBS/NT v4.00 MP