Re: [ATM] 6" F4.5 Figuring Question

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-01-28 10:17 -0500, Jason wrote:

>I have been working on a 6" f4.5 mirror and I am having trouble parabolizing
>it.  I'm using a full size lap and it doesn't seem to want to go past a
>sphere no matter what stroke I use.  The substrate is quartz so I know it
>will move slower than pyrex but the figure still seems to be stuck.  What is
>the best way to make progress in my situation?

First try Texereau's method C on p. 97 which he said worked on a 10"f/4 
mirror.  If no action, go to small tool method B - small tools are quite a 
bit slower than full lap, but you can concentrate on the zones you have 
to.  Third, and probably least, deformed lap = petal lap = starlap.  I have 
a starlap design program:

         http://home.earthlink.net/~burrjaw/public/starlap.zip 
(2002-08-02, Win32, 243 k)

You have to input a surface deviation file and it designs a starlap to fix 
those deviations.

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84) 

_______________________________________________
ATM mailing list http://www.atmlist.net/