BallReviews
General Category => Miscellaneous => Topic started by: thewhiz on September 17, 2015, 02:45:02 PM
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Can someone explain to me what a drilling on a ball means and what the ball will do if someone says it's drilled 50 x 4 x 40? Or a drilling of 40 x 4.5 x 45? Very confusing to me.
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Those are dual angle layouts, and the layouts as listed will give an experienced bowler a general idea of where the pin and MB are located on the ball. I say general because each bowler is different and has a different PAP. So the layouts are all geared towards that specific bowlers PAP, which the driller then uses as a reference to layout the ball.
If you look into the Ball Reviews FAQ's section there should be a couple of discussions that we've had previously on this topic.....and within those discussions you'll find a couple of links to videos that will explain all this more clearly. Hope this helps.
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Maybe this will be of some use to you.
http://www.bowlersreference.com/Ball/Layout/Dual.htm
http://wiki.bowlingchat.net/wiki/images/c/cd/DualAngle.pdf
http://www.bowlingball.com/BowlVersity/how-to-layout-a-bowling-ball-dual-angle-layout-technique
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Slowinski has an article on how to choose a dual angle layout for patterns.
http://bowlingknowledge.info/images/stories/slowinskiaug11.pdf
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Can someone explain to me what a drilling on a ball means and what the ball will do if someone says it's drilled 50 x 4 x 40? Or a drilling of 40 x 4.5 x 45? Very confusing to me.
Basic info
Dual Angle Info:
The Dual Angle Layout Technique is made up of three measurements:
1. The Drilling Angle: Which affects the length of the skid phase of the ball.
Higher angles = A Longer Skid phase.
Lower angles = The quicker the transition into the hook phase.
2. The Pin to Positive Axis Point (Pin-to-PAP) distance:
The Pin to PAP distance affects the amount of the flare.
3. The Vertical Axis Line (VAL) angle: Controls how long the ball remains in the hook phase.
Smaller Angles to the VAL lowers the RG, and increases the total differential of the ball. This results in the ball reving up faster and transitioning faster from the hook into the roll phase of the ball.
Larger Angles to the VAL raises the RG, and decreases the total differential of the ball. This results in the ball reving up slower and transitioning slower from the hook into the roll phase of the ball.
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For symmetrical balls the drilling angle is used only to position the cg for static weights that will allow a particular balance hole location to be used. For asymmetrical balls the drilling angle affects the distance of the first transition (from skid to hook). -- JohnP