Okay, P.A.P. (Positive Axis Point) When you release your ball, it's rotating around a "Axis" just like the Earth rotates around it's axis and just like the Earth, Your ball has a North and South pole.
The PAP location measurements (Example: 4 7/8" over 1/4" up) basically tells you where the balls North pole is in relation to your grip.
Knowing this location is important to laying out a ball, so that you can orient the balls core in the proper way to get the reaction your desire.
Also know it's location it allows you to place markers on the ball to count revs and determine rotation and tilt (though tilt can be determined better by measuring oil ring diameter and finding it on the tilt chart).
Tilt tells you how much your balls "Axis" is tilted in relation to the lane surface. When it's parallel to the lane, that's 0° of tilt. When it's perpendicular to the lane (spinning like a top), that's 90° of tilt.
Rotation is a measurement of the direction of the initial rotation on the ball with respect to the lane. It is a measurement of the angle between the initial spin axis and the foul line running across the lane. 0° of rotation is when the axis is parallel to the foul line, 90° of rotation is when the axis is perpendicular to the foul line.
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