That's a QC tolerance issue, and part of what you pay for in premium bits. Different manufacturers have different tolerances and different sampling numbrs.b You can end up with an out of spec from any vendor. My mike is only marked to thousandths so I can only extrapolate to perhaps half a thou, but there was no discernible difference on my Whiteside bit. Now, whether or not being off by 7/1000" is significant is another issue, as the wood will swell/shrink more than that with changes in humidity.
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Last edited by BigJimAK; 05-09-2010 at 01:37 PM.