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[ATM] machine generated zones


Hi,

My first work with a polishing machine.  16" f/1.88 sphere.

There is a "hole" in about the inner 2 inches.  It looks much
like a crater on the moon.  There was no side-to-side motion on
the lap.  The lap was 12 inches diameter.  Other than the crater,
the finish was smooth, an excellent sphere, with no TDE.

Can anyone tell me the cause and cure?

Steve Beccue
steve@beccue.com
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