Re: [ATM] Oversize tools questions - was Pitch Substitute for veryfast mirrors

["Mitch" <funnybone101@earthlink.net>]

For parabolization (even on big fast mirrors like 20 inch f/5) shape the
pitch on the oversized tool into a starred parabolization pattern and add
differential pressure and alter strokes to accumulate differential polish
time.  The oversized tool keeps the edge zones behaving nicely - like
training a dog!

Mel Bartels

     But when figuring if you're moving it around a lot to press aren't you
compromising your figure? Or on big mirrors is it not as big of a factor as
on little ones?

Mitch

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