How does a single-wheel machine like the B1-Curveball throw a curve?
It is done in much the same way as it is done on the BATA-2, except that instead of one wheel going faster and one wheel going slower, you have one wheel rotating, and a compression pad that does not move, which would be the equivalent of a second wheel which was not rotating at all (which would represent the slower wheel). All of the spin is produced by the one rotating wheel, which basically rolls the ball off of the compression pad. If you have the wheel below the compression pad, the spin goes backward, and the machine throws a fastball. If you rotate the head of the machine so that the wheel is above the compression pad, the spin will go forward, and the machine throws a curve. The machine may also be tilted so that the spin is more sideways, making the ball curve more to the side, rather than just straight down.
