JUGS Sports Curveball (2 wheel) Pitching Machine - Manual (Page 21)

WARNING: Equal dial speeds—and any dial speed differential of less than
35 digits—may result in a knuckleball. Knuckleballs can be
dangerous and SHOULD NOT be thrown.
Figure 6.
Dial Settings for Various Pitches
Use the following diagrams shown below in figure 6 as guides for using the JUGS
Curveball pitching machine. Each diagram shows the approximate tilt of the
wheels. Numbers represent the speed dial settings.
IMPORTANT: You may have to vary speeds slightly from the examples to get the
desired accuracy and consistency.
19
Operation