Re: [ATM] polishing and figuring a 32"

[Hugues.Laroche@ses-astra.com]

Hello Fabio and Bob,

>32" is a big scope anywhere!
>The motions for polsshing are basically the same as what you would think,
>back and forth as the mirror turns underneath.  You basically have to
cover
>all of the area of the mirror evenly to get a good polish.

Well, I precisely do not find THAT obvious to do!?

With my 45" (yeah that is not only big it is completely crazy)
I polished with a 2/3 tool by hand until recently (pads, not pitch!).
Due to the size of my arms (for once I am sorry not to be a monkey ;-)
I could never make COC strokes so all has been done with more or
less off-center strokes. The mirror is not completely polished out
yet and I plan to continue with a machine, which is a different world.

But the bottom line is that, because of my strokes or because of
the mirror support (stronger in the center) or both, the mirror
got substantially overcorected (b=-2.9).

Happy ATMing...

Hugues
Luxembourg, Europe



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