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Simplified Drilling Techniques
The following drillings are for those times when a PAP (Positive Axis Point) is not available. These drillings give the bowler three different amounts of hook, with three distinctly different break points. please note, to avoid tracking over the finger holes, keep the pin lined up with or slightly above the finger holes.
Label Drilling
- Purpose:
- This drilling products a good skid through the front part of the lane, with an even arcin backend reaction
- Procedure:
- Place pin at 1:30 in relation to CG (Center Gravity). Place CG (Center Gravity) at center of grip.
Length/Forward Roll Drilling
- Purpose:
- This drilling is excellent when playing inside angles. It produces good skid through the front part of the lane, with a defined break point and a strong forward roll into the pins.
- Procedure:
- Place pin over ring finger at 10:30 in relation to CG (Center Gravity). Place CG (Center Gravity) on midline 2" from center grip. Place balance hole 4 1/2" from center of grip on midline.
Maximum Hook and Backend Drilling
- Purpose:
- This drilling will produce the most hook and strongest backend reaction. This technique works well from any angle when trying to create area on the lane
- Procedure:
- Place pin at 12:00 in relation to CG (Center Gravity). Place CG (Center Gravity) on midline 2" from center of grip. Place balance hole 4 1/2" from center of grip on midlin
Choosing the Correct Ball For Your Customer
1. Radius of Gyration (RG) or spin-rate refers to a balls ability to rev up.
- Low RG
- Medium RG
- High RG
2. Coverstock is the only part of the ball that contacts the lane surface. The measurement for the amount of friction created between the coverstock and the lane surface is Coefficient of Friction (COF). This can greatly effect the amount the bowling ball will hook and perform.
- Mild Coverstock
- Medium Coverstock
- Very Aggressive
3. Track Flare Potential is a measurement of the balls axis migration from the point of the bowler's release to the pins. The higher the track flare, the earlier and more the ball will hook (oily lanes). Less flare creates better length and later hook (drier lanes).
- Small Flare (0"-3")
- Medium Flare (3"-5")
- Large Flare (5" plus)
Advanced Layouts
This guide is designed to give the ball driller a choice of eleven different drillings. These drillings are broken down into three different amounts of hook, each having three different backend reactions. We hope this system allows you and your customer to take advantage of AMF's leading edge technology.
General Guidelines
- When determining the PAP (Positive Axis Point) on a large flare potential ball, subtract 3/4" from bowler's horizontal axis coordinate when axis point is measured on a ball with 1" or less of flare. If the axis point in measured on a ball with 1" to 3" of flare, subtract 3/8" from bowler's horizontal axis coordinate to determine the correct axis coordinates. If the axis point is measured on a ball with more than 3" of flare, use that axis point for the PAP (Positive Axis Point).
- With all drillings, keep the pin 1 1/2" on the grip side of the midplane and above a line drawn from the bowler's PAP (Positive Axis Point) through his ring finger hole to prevent the ball from rolling over the gripping holes.
- On those drillings where CG (Center Gravity) does not fall on the midline, draw a line from Center of Grip through CG (Center Gravity) until the line intersects midplane. Place balance hole at line's intersection with midplane or beyond as required by the drilling
- To gain control of the breakpoint, reduce side weight toward a limit of 3/4 oz negative side weight by use of a balance hole.
Leverage/Strong Backend
- Purpose:
- This drilling produces the maximum hook and backend reaction of any of the advanced drilling instructions. This technique works well from any angle when trying to create area.
- Procedure:
- Place pin 3 3/8" from PAP (Positive Axis Point). Place pin 1 1/2" to 2" on grip side of the midplane. Place CG (Center Gravity) 2 1/2" to 3" from PAP (Positive Axis Point). Place balance hole on midplane
Low RG/Arc
- Purpose:
- This drilling produces the most even roll pattern of all suggested drillings. It should be used for maximum controll of the break point on overreacting (wet-dry) lane conditions, or freshly oiled lanes with no carry down.
- Procedure:
- Place Pin 1" to 1 1/2" from PAP (Positive Axis Point). Place CG (Center Gravity) approximately 4" to 5" from PAP (Positive Axis Point). Balance hole may be placed up to 2 1/2" beyond midplane to gain desired reaction.
Low RG/Forward Roll
- Purpose:
- This drilling works well for players with a lower track. This technique works best when the lane is oiled heavily and the backends are medium to dry.
- Procedure:
- Place pin 1" to 1 1/2" from PAP (Positive Axis Point). Place CG (Center Gravity) on PAP (Positive Axis Point) . Place balance hole up to 2" beyond midplane to get desired reaction.
Low RG/Strong Backend
- Purpose
- This drilling has the strongest backend reaction of any of the low RG drillings. This drilling combines moderate hook, heavy roll, and a good backend reaction.
- Procedure:
- Place pin 1" to 2" from PAP (Positive Axis Point). Place CG (Center Gravity) 1 1/2" from PAP (Positive Axis Point) on midline. Place balance hole up to 2" beyond midplane to gain desired reaction.
High RG/Arc
- Purpose:
- This drilling produces small hook and works well when playing down the boards on overreacting hooking lanes.
- Procedure:
- Place pin 5 to 5 1/2" from PAP (Positive Axis Point), keeping pin above finger holes. Place CG (Center Gravity) at center of grip.
High RG/Forward Roll
- Purpose:
- This drilling produces good skid with a defined break point, and heavy roll into the pins.
- Procedure:
- Place pin 5: to 5 1/2" from PAP (Positive Axis Point), keeping pin above finger holes. Place CG (Center Gravity) 1" to 2" from PAP (Positive Axis Point). Place balance hole up to 1 1/2" beyond midplane to obtain desired reaction.
High RG/Strong Backend
- Purpose:
- This drilling works best from inside angles
- Procedure:
- Place pin 5" to 5 1/2" from PAP (Positive Axis Point), keeping pin above finger holes. Place CG (Center Gravity) 4 1/2" from PAP (Positive Axis Point) on midline. Place balance hole up to 1 1/2" beyond midplane to obtain desired reaction.
Leverage/Arc
- Purpose:
- This drilling produces large hook with a controllable backend reaction. This technique works best when playing outside angles or when there is a track shot.
- Procedure:
- Place pin at 1:30 position in relation to CG (Center Gravity), 3/ 3/8" from PAP (Positive Axis Point). CG (Center Gravity) should be on midline near center of grip
Leverage/Forward Roll
- Purpose:
- This drilling increases revolution and overall hook. this technique works well on heavy oiled, blended lanes and gives the bowler a very defined break point, with heavy forward roll into pins.
- Procedure:
- Place pin 3 3/8" from PAP (Positive Axis Point). Place CG (Center Gravity) 1" to 2" from PAP (Positive Axis Point) on midline. Place balance hole on midplane.
Full Roller Leverage
- Purpose:
- This drilling produces the most hook, flare and backend reaction for any full-roller.
- Procedure:
- Draw line from pin through CG (Center Gravity). Place pin 3 3/8" from PAP (Positive Axis Point) on that line (Center of Grip will be 10 1/8" from pin on line). Place balance hole halfway between pin and midplane. Pin will be 3 3/8" beyond midplane above midline.
Full Roller Label
- Purpose:
- This drilling produces an even arcing motion for a full-roller.
- Procedure:
- Place pin at 8:00 position in relation to CG (Center Gravity). Place CG (Center Gravity) on midline 1/2" on positive side of centerline.
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