http://morichbowling.com/Drilling/Du...gleSeminar.htm
It's a bit complex but it covers most of what one would need to know. It explains the measurements in degrees, there's another method for inches. The drilling angle is kind of another way of saying MB to PAP distance, but not exactly. The VAL angle is also known as a pin buffer, the distance between the pin and VAL. The effects of these, as well as the pin to PAP distance, are in the article.
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