From: hermit 
To: Mark Holm 
CC: atm{at}shore.net
Reply-To: hermit 


Mark Holm wrote:
>
> Recently I did a BVC mirror with cerium oxide then switching to zirconium
oxide.
>   I noticed that the material removal rate seemed slower with the zirconium
> oxide  (judged by rate of figure change using similar strokes) and the
surface
> seemed to look smoother as well.  I seemed to get a fairly visible
"printing"
of
> the square lap facet pattern onto the mirror surface with cerium oxide, but
not
> with zirconium oxide.
>
> I haven't had the experience of switching from cerium oxide to rouge, so can
not
> comment directly on that, but my experience suggests it may be worthwhile to
try
> for something slower than cerium oxide for final polishing and figuring.
>

You can feel the difference going from Cerium to Rouge.  But with a thin
Cerium  mix and heavy pressure, you get a very smooth surface anyhow. At
least that is my experience with machine polishing.

Ken

--- BBBS/NT v4.00 MP