Bowling Ball Core Zoning for No-Thumb Radius of Gyration
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Solution Overview
Problem
Bowling balls designed for two-handed bowlers without thumb holes face limitations due to changes in USBC regulations, particularly in managing mass properties and radius of gyration, which affect performance characteristics.
Innovation Solution
A bowling ball core design with strategically configured inner and outer core layers, including a high-density inner core with distinct zones and a cover stock layer, allows for customized performance by adjusting radius of gyration values through targeted finger hole placement, maintaining desired performance characteristics without a thumb hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional two-finger and thumb hole configuration is used, then mass properties can be effectively managed, but no-thumb bowlers face limitations in customization
Solution Approach 1:
The core is divided into multiple density zones (high-density inner core layer, intermediate-density outer core layer, and low-density cover stock) to independently control mass properties. This segmentation allows customization for no-thumb patterns while maintaining performance reliability through precise differential and radius of gyration control.
2Manufacturing precision
If USBC regulations restrict weight hole manipulation, then mass property management becomes more difficult, but ball design must stay within specifications
Solution Approach 1:
Different regions of the core have different densities tailored to specific functions: the inner core layer has high density for stability, the outer core layer has intermediate density for differential control, and the cover stock has low density for surface performance. This local quality differentiation enables precise mass property control within USBC specifications without requiring weight hole manipulation.
Solution Approach 2:
The bowling ball uses a composite structure with multiple materials of different densities layered together. The high-density inner core, intermediate-density outer core, and low-density cover stock create a composite system that achieves desired mass properties and performance characteristics while complying with regulations that forbid weight hole manipulation.
3Manufacturing precision
If inner core layer extends closer to cover stock in first and third zones, then radius of gyration values can be optimized, but manufacturing complexity increases
Solution Approach 1:
The core geometry is extended in the radial dimension, with the inner core layer projecting closer to the cover stock in specific angular zones (first and third zones). This dimensional variation in the radial direction enables precise control of radius of gyration values while maintaining a manageable core structure through systematic zonal differentiation.
Data Source
AI summary
A bowling ball with selected performance characteristics can include an inner core, an outer core and a cover stock layer. The inner core can be configured with a first zone that can extend substantially along a first axis defined through the inner core; a second zone that can be located between the first axis and a second axis that extends substantially perpendicular to the first axis; and a third zone can be located adjacent the second axis. A plurality of finger holes can be formed through the cover stock layer and can be selectively located within at least one of the first, second, or third zone selected based on a target RG value.