From MO:
"If the two angles add up to 30°, the ball will transition as quickly as possible. If the two angles add up to 160°, the ball will transition as slow as possible. Keep the sum of the two angles between 30° and 160° to create effective ball reactions while still allowing the ball to maintain hitting power. Yet the drilling angle must still be kept between 10°and 90° and the angle to the VAL between 20° and approximately 70° (depending on the bowler's track).
Smaller angle sums should always be used for:
Speed dominant players
Higher axis tilt players
Longer oil patterns
Higher volumes of oil on the lane
Larger angle sums should always be used for:
Rev dominant players
Lower axis tilt players
Shorter oil patterns
Lower volumes of oil on the lane
Medium angle sums should always be used for players whose ball speed and rev rate match.
Keep this in mind -- the sum of the drilling angle and the angle to the VAL determines how quickly the ball transitions from skid to hook to roll. Using a smaller sum of the two angles will turn translational energy into rotational energy faster. And the shape of the breakpoint can be controlled by changing the relationship between the drilling angle and the angle to the VAL.
