In addition, the manufacturer must precisely determine the performance, particularly the amount of hook, that will be produced by each drilling pattern. For example, molds have to be built for both the core and shell. After the ball has been molded, it must go through an extensive testing process to objectively determine its performance in relation to other balls. For Ebonite's new asymmetric core balls, this would have been an overwhelming process. Engineers decided to investigate the alternative of computer simulation.
Friction varies with lane oiling conditions and the degree of track flare.
When the ball finally contacts the pins, an enormous number of additional potential contacts arise. DADS enables engineers to assemble, simulate, and animate mechanical systems quickly. Measurements of the bowler's grip are used to orient the grip with respect to the ball core and the bowler's rotation axis. A table is created to define the oiling conditions at any point on the lane, which determines an effective ball-lane friction coefficient. Contact properties are obtained from physical test data.