[ATM] slow polishiing

[Bill Mitchell <astronutski@yahoo.com>]

I'm polishing a 6" f/7 Pyrex blank (my first mirror) and it seems to
not be progressing at all.  I'm using CeO with a Burgundy pitch lap,
everything from the WB kit.  After about three hours I took a peak at
it in the Foucault and Ronchi and was told I have the classic sphere
within a sphere and all that meant was that it wan't polished out
yet.  I wasn't expecting to be at that point.  Now I have over 7
hours in it and there has been no noticable change to that sphere
within a sphere that I saw at 3 hours.  I am cold pressing with mesh
for 1/2 hour before each hour polishing session.  I have had to
re-channel twice which from what I've read sounds about right.  I
alternate TOT, MOT at about 3:1 TOT.  Using 1/3 COC slow strokes and
I can feel really good contact.  I'm using about a nickel to quarter
sized CeO plop which is thinned about 4 water to 1 CeO.  I usually go
around the barrel three times to a wet, about 15 minutes worth.
I'm not afraid of the monotonous polishing but I'm not seeing any
progress and it's getting frustrating.
Any help would be very welcomed!

http://www.atmlist.net/contrib/astronutski-at-yahoo-dot-com/n3068.jpg
http://www.atmlist.net/contrib/astronutski-at-yahoo-dot-com/n3078.jpg

Clear skies,
Bill



		
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