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Fig 1
Fig 2
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Fig 3
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Fig 4
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Fig 5

Perpendicular bat rolling was the first type of bat rolling machine to be manufactured. Perpendicular bat rolling was the industry standard in the infancy of rolling. The Perpendicular method breaks the resin up in 1/4 of an inch stripes along the barrel at maximum pressure (see fig 1-2). As bat rolling evolved so did the machines and the parallel roller was created. The parallel roller is able to put consistent pressure along the entire circumference of the barrel to break up resin completely (see fig 3). For this fact perpendicular rolling followed by parallel rolling has become the bat rolling standard.

Parallel rolling is optimized with a 6 inch roller. Most slowpitch softball bats have a 9 inch sweet spot (see fig 4). Parallel rolling will cause the barrel to flex about 1 1/2 inches past the roller at maximum pressure (see fig 5). The flex should not extend into the end cap area or the taper area for risk of damaging the integrity of the bat. The 6 inch roller will not damage the taper area or end cap area but a larger roller has the potential to flex the composite material in these areas and cause structural problems with the composite.
What are the effects of perpendicular and parallel bat rolling?
Perpendicular and Parallel Bat Rolling
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