DUAL ANGLE LAYOUT TECHNIQUE™ - Reasons for Angle To VAL
*** The Angle to the VAL
The angle between the Pin to PAP line and the VAL is referred to as "the angle to the VAL." This angle is as important as either of the first two components of the Dual Angle Layout Technique™. Changing the angle between the Pin to PAP line and the VAL has a very significant effect on how much the RG and the total differential of the drilled ball changes from the same specifications of the undrilled ball. The angle between the Pin to PAP line and the VAL is effective from a minimum of 20° and to a maximum of approximately 70°.
• Using the minimum 20° angle will result in the drilled ball revving up the quickest and transitioning the fastest at the breakpoint.
• Using the maximum 70° angle will result in the drilled ball revving up the slowest and transitioning the slowest at the breakpoint.
Using a smaller angle between the Pin to PAP line and the VAL (minimum of 20°) will lower the RG and increase the total differential of the drilled ball. These changes will result in the ball revving up faster and transitioning quicker. Using a larger angle between the Pin to PAP line and the VAL (maximum of approximately 70°) will raise the RG and lower the total differential of the drilled ball. These changes will result in the ball revving up slower and transitioning slower.
Strong Asymmetrical Ball
Drilling: 50°, Pin 5" from PAP, Different Angles to the VAL
Angle to VAL
|
Low RG Axis
|
Asym Diff |
Total Diff |
Undrilled
|
2.488
|
0.030 |
0.048 |
20°
|
2.493
|
0.038 |
0.051 |
45°
|
2.498
|
0.035 |
0.041 |
70°
|
2.500 |
0.033 |
0.039 |
Symmetrical Ball
Drilling: 50°, Pin 5" from PAP, Different Angles to the VAL
| Angle to VAL |
Low RG Axis
|
Asym Diff |
Total Diff |
Undrilled
|
2.463 |
0.000 |
0.050 |
20°
|
2.469 |
0.008 |
0.051 |
| 45° |
2.473 |
0.004 |
0.043 |
| 70° |
2.475 |
0.004 |
0.041 |
For most bowlers, the largest "safe" angle between the Pin to PAP line and the VAL should result in the pin ending up just below the finger holes. Very high track bowlers are the exception to that rule. For very high track bowlers, the maximum angle between the Pin to PAP line and the VAL should result in the pin ending up just above the fingers.
DUAL ANGLE LAYOUT TECHNIQUE™
1 - Introduction to Dual Angle Layouts
2 - Core Comparisons (Asymmetrical/Symmetrical)
3 - Reasons for Drilling Angles
4 - Pin/PAP Distance Information
5 - Track Flare Information
6 - Reasons for Angle to VAL
7 - Layout Method (Part One)
8 - Layout Method (Part Two)
9 - Layout Method (Part Three)
