Re: [ATM] Polishing / Figuring Simulator

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-05-07 22:52 +0200, Martin Cibulski wrote:

>I wrote a program to simulate the effects of figuring strokes
>on a mirror. The program and some ideas how to use such program
>for figuring can be found here:
>
>Tool overhang cannot be simulated. Perhaps someone
>else has an idea to calculate the pressure distribution in this case.

Take a look at my starlap design program:

         http://home.earthlink.net/~burrjaw/public/starlap.zip 
(2002-08-02, Win32, 243.5 k)

The choice "2/5 stroke" does take into consideration tool overhang, but the 
pressure (per unit contact area) is assumed constant, so the action as a 
function of zone radius is proportional to the average mirror-lap contact 
at that radius.

The current effort is figuring an RC cass secondary to match a primary - 
quite difficult because the target surface has both fixed radius of 
curvature R and conic constant b.  I've written a program that does 
"figuring feedback"; you give it three surface deviation files:

         tool <before> <design> <after>

with <before> = deviations before the spell, <design> = deviations used to 
plan strokes or a starlap for the spell (could simply be equal to 
<before>), and <after> = deviations after the spell.  The program then 
generates a new design to be used for the next spell which "should" reduce 
the <after> deviations.  The hope is that this could incorporate such 
unmodeled things as stroke and pressure variations.  I'll post it if I can 
get it to work for the RC secondary figuring task.

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

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