From: "Jerry B. Hillman" 
To: 
Reply-To: "Jerry B. Hillman" 


Hi all,
Would someone please point me to a web site or whatever so that I can learn
to make a star lap.
Working TOT with this 10" tool creates problems for every problem I
solve. Primarily, if I polish off center, the inside edge of the lap digs a
hole in the center of the mirror.  If I polish COC, the center goes flat.
The W stroke creates a rolled edge regardless of overhang. I am doing
something wrong and all but the very newest links in the archives are dead
links. All I was able to find out is that a star lap makes it easier to
parabolize a large mirror. Clear skies, Jerry
http://www.convertabarn.com/Figuring.htm

New ronchi gram posted.

--- BBBS/NT v4.00 MP