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echo: atm
to: ATM
from: mlt{at}ns.sympatico.ca
date: 2003-03-17 06:24:50
subject: Re: ATM ROC with a straight edge and drill bits

To: atm{at}shore.net
From: MLThiebaux 
Reply-To: MLThiebaux 


To correct for a broad feeler gauge {or for that matter a loose-fitting drill bit):

If the width of the feeler gauge is  W, or equivalently if the drill bit is
loose and can be moved back and forth under the straight edge by the total
amount W, then  ROC = (D^2-W^2)/8T.  D = mirror diameter, T = gauge
thickness or bit diameter.

Martial Thiebaux
Rawdon Hills, Nova Scotia

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