Posted by: ray porco () on Mon Sep 8 17:00:23 2003

Jack,

The following is taken from the protocol adopted by the NCAA when baseball bats are submitted for certification.

---------Torque Cutoff to Coast
The torque supplied to the bat by the servo is cutoff 12.8 inches prior to impact. This torque cutoff ensures that the bat is coasting through the bat/ball collision as opposed to being powered through the collision. This 12.8-in. specification is accomplished by using a pot value of 0.32 in the servo-control program, where each 0.01 of pot setting equates to 0.4-in. Therefore, because the bat speed may vary from test to test, the coast time will likewise vary from test to test, but the coast distance is fixed to be 12.8-in.-------------

The following is a question I asked Paul on 12/21/2000:

“a bat clamped in a vise so as to render it practically immoveable vs. a bat attached to a steering wheel knob so as to rotate freely. a ball pitched identically to each. which ball will rebound farther?”

Never got an answer.

Comments? Answer?


ray porco