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Re: [ATM] Parabolizing 6" f/4.5 Issues

At 2005-02-15 07:59 -0600, Douglas Arion wrote:

>I'm trying to finish figuring on a fast 6". Here are the
>data:
>...
>
>Suggestions??? Edge appears raised; zone around 40% raised,
>at least via FigureXP.

Sixtests agrees with the profile shape.  The surface RMS 19.5 nm is 
passing.  The best-fit conic b = -0.953, so if you really want to try 
making good better, I'd suggest maybe a 30 s spell of some parabolizing 
stroke.  The 2-sigma confidence interval about the RMS estimate is pretty 
big at ±6.6 nm, so it wouldn't hurt to make the probability of not passing 
smaller - reduce the RMS, test with more zones, cheat and say your reading 
sigma is better than .03 mm, etc.

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

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