900 Global is proud to introduce another technological advancement in core design. Featured inside “Train”, the symmetrical Combustion core design manipulates the Rg contours within the bowling ball. This technology allows for the typical axis migration path to be shifted which thus influences the overall ball motion and continuation of the “Train”.
Typically, a symmetrical cored bowling ball Rg’s published by the manufacturer represent the calculated Rg of two primary axes X and Y. Stated differently, the Rg value is measured through the pin (X Axis) and a location 90 degrees to the pin or 6 – ¾’’ down from the pin through the CG mark (Y Axis). The measured and calculated Rg values on these two points represent the low Rg and High Rg values respectively. Despite only publishing the low and high values, it is important to understand that an Rg value can be measured and calculated for ANY particular location on the bowling ball. 900 Global 3D-CAD Pro Engineer Software extension pack “BMX Modeling” calculates each and every Rg value across the entire bowling ball and then plots a 3D Rg Contour map that displays all of the value. A previous traditional symmetric core Rg contour map is below in Figure 1. Each different colored band represents a different Rg value. The Rg contour values and position are based upon the specific core design and mass of the core. As shown in Figure 1, traditional symmetric core designs have Rg contours positioned in a manner that has the lowest Rg directly beneath the pin and all contour bands are perpendicular to the low Rg X-Axis.
Figure 1: Traditional Symmetric Rg Contours
As proven in previous research, Rg contours have a role in affecting ball motion through the core design. Drilling techniques yield different ball motions because they place the starting PAP on different Rg contour bands from one drill pattern to the next. The 2007 Axis Migration Study conducted by USBC concluded that a bowling ball created a flare path (Axis Migration) that stays on the same Rg contour band. Using “BMX Modeling” software, 900 Global can predict the axis migration and flare path of a bowling ball based on the Rg contour that the PAP starts on.
The Combustion core design uniquely distorts and manipulates the Rg contours from the traditional placement. Figure 2 below shows the Rg contours of the “Train” Combustion core are tilted compared to Figure 1. The contours are tilted at 10 degrees from the primary X-Axis. Standard drilling practices are still used to optimize the ball motion. If one was to place the same drill pattern on the Combustion core and another traditional symmetric core design having the same low Rg/high Rg values, and same coverstock/finish it would be noted that the Combustion core design influence would yield an axis migration on a slightly higher Rg contour with the migration path altered that ultimately produce a ball motion that is more responsive and continuous through the entire ball path.
Figure 2: Combustion Core Rg Contours
In conclusion, 900 Global has again taken another step forward in the advancements of core design technology. “Train” features a unique new core design that allow for unprecedented on lane performance. The altered Rg contours allow for a change in typical axis migration. Coupled with the S76 shell and NEAT-E finish, this Train is coming and sure to “Run ‘em Over