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ATM Funny blank





Hi

  I have just received my first blank and tool. They are of pyrex and 8" diameter. However there is a series of concentric rings on one surface of each pyrex disk. The rings are nearly 2mm high. Will these cause a problem with glass stress? Figuring? They make good nonslip handles when its wet though. You can see a photo of them here

http://www.geocities.com/andrewjmelville/ATM

 Andrew J. Melville

 There are two kinds of people, 
those who think there are two kinds of people
and those who know better.