Re: ATM polishing

["Mel Bartels" <mbartels@bbastrodesigns.com>]

>>>
Hi , Im working on my first 8 inch mirror, and have spent about 10 hrs
polishing with a pitch lap and CeO. A four millimetre ring around the edge
of the mirror does not seem to be polishing out, . Could anyone suggest a
strategy to remedy this, without of course going back to fine grinding.
<<<

Does it show any signs of polishing?  Sometimes a narrow ring persists at
the edge during polishing, particularly if the lap is too small and or the
polishing strokes too short or not wide enough.  By the way, 10 hrs is a
long time for a 8 inch mirror.  Did the mirror mostly polish out in several
hours, or are you being cautious?  You can really ramp down during
polishing - the goal is to remove the damage caused by the pits in fine
grinding.

Mel Bartels