Graham:
Good question on a panacea formula for sigma calculation.  At 800 I came up
with 4.615707 sigma.  Yes, I did it the hard way.  That was breaking down
the inbetweens and arriving at a PPM and a sigma.  I don't even know if
that's legal.  arg!

I like Mike McMaster's comment.  It may be easier to do this using
measurements from a screw size, weight of something, or some objective
measurement.  The numbers all fit rather than using subjective data and PPM.

Now that I have confused everyone including myself.  I plan on going home,
eat dinner, and play my bass guitar for a while and ponder these things.

Good Night All
Ron

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