From: "Stathis Kafalis" 
To: "Jerry B. Hillman" ,
        
Reply-To: "Stathis Kafalis" 


There is a lot of hints on star laps in the web. See my pictures:
http://www.geocities.com/dobsonstathis/bilder/sterntool_25cm.jpg
http://www.geocities.com/dobsonstathis/bilder/14startool_15cm.jpg

I suppose, you have no good contact with your lap, or the blank is very
thin and the underground not flat ernough. If so, see also my webpages at
14" ultrathim mirror.

Stathis Kafalis
http://www.geocities.com/dobsonstathis

----- Original Message -----
From: "Jerry B. Hillman" 
To: 
Sent: Saturday, May 03, 2003 2:57 AM Subject: ATM star lap


>
> 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