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echo: atm
to: ATM
from: sberfield{at}xbox.com
date: 2003-04-26 22:00:50
subject: ATM Tips on polishing to sphere

To: 
Reply-To: "Scott Berfield" 



while I seem to finally be making progress on the polishing of my 12"
- the laser is noticeably less visible on the surface, though it is still
pretty bright at he outer edges. Unfortunately I now have a pretty not
spherical shape according to the ronchi test. My camera is not working so i
did a crude sketch. Can I get some pointers on taking it back to a sphere
as I get rid of the rest of the pits? The mirror is a 12.375" f4.55
(at present). The screen is 150 CPI. Drawing is at
http://www.berfield.com/ronchi.jpg

Thanks in advance.
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