Re: [ATM] sharpie test

["c f" <quantemlp@hotmail.com>]

>
>I do not understand how the tool used for two mirrors can ever be "the 
>same"
>with respect to both. Tool and blank are constantly changing their shape
>while grinding (or polishing). So when we start to use the tool with 
>another
>mirror
>it will be different than when we started with the first mirror. Even if
>only one wet
>apart.
>And yet as you explained it seems that you ended with identical results for
>both mirrors. My reasoning obviously does not fits to facts.
>Some  mysterious "averaging" must be at work.
>  Is there some rational explanation?

totally Identical would be that they are the exact same ROC.  The Identical 
results was to intend that I used the same number of wets with equal strokes 
to disapate the lines evenly during the sharpie test.  If it was taken that 
these mirrors are identical down to the nanometer, than of course they are 
not as no mirror is identical, there is allways something making them 
unique.  When I do the wets though, I change mirrors every wet, and count 
the strokes of each wet.  Granted the pressure may vary slightly causing a 
slight variation in mirror depth.  So far measured, the mirrors are within 
 >1% of each other only variing in sagata by 1/10,000 according to the 
machine shop down the street that does my measuments for me.  I do hope to 
get them into a spherical shape within 1/100,000 of an inch or better if 
possible.

charles
>
>Vladimir.
>
>
>
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