Re: [ATM] 16 inch f4.5 refigure, full size or smaller?

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-02-02 22:03 +0000, Ed Witkowski wrote:

>I have a series of test results on my 16 inch mirror.
>A ronchi
>Results from a digital foucault.
>Results from a classic foucault, six zones.
>Results from a Lateral wire test, with data entered into sixtests.
>links here: http://home.comcast.net/~edwski/astro/astropage.htm

Man, with all those tests saying almost the same thing, the deviations have 
really been pinned down.

>Option 1.
>Prepare a full size lap.
>work back to sphere.
>refugure.
>
>option 2.
>Make subdiameter lap(s), have access to 6, 8, 10 and 12 inch tools.
>work zones that require "working".

With the mirror almost passing (Strehl ~ .8), I'd reject option 1.  Option 
2 would be a lot of work - three high zones:  0-3", 5.8-7", and the 
edge.  So you'd need the 6" tool for the center, only a 1" tool around the 
narrow zone (slow!), and maybe a thumb around the edge.

Let me suggest option 3:  a starlap.  Post the raw classic Foucault and the 
LWT data, and I'll gin up a starlap design.

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

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