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[ATM] What kind of lap

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Subject: [ATM] What kind of lap
From: "David Williams" <dwilliams1128@earthlink.net>
Date: Sun, 27 Jun 2004 12:57:00 -0400
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Reply-To: David Williams <dwilliams1128@earthlink.net>
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Hello

I'm the guy with the 20" F5 mirror and I'm polishing it, got most of the pits out, and I've heard some people say use a sub-diameter lap and some people say use a full size lap:)

When I used the foucault tester I got an image of a faint dougnut.  Of course some people say don't use the foucault test until it's fully polished.  

Thank you.
David



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  - From: "Jerry B. Hillman" <JBHillman@ev1.net>

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