JUGS Sports Curveball (2 wheel) Pitching Machine - Manual (Page 20)

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Throwing Straight balls:
1. A straight fastball can be thrown by setting the pitching machine with one wheel
directly on top of the other wheel (figure 5a) and adjusting the lower wheel to
a faster speed than the upper wheel. A minimum of 35 digit differential should
be maintained between the speed dial settings of the two wheels at all times.
2. To throw straight fastballs, you must set speed dials 35 digits apart, as shown
in figure 6. For faster straight balls, turn both speed dials up the same amount.
For slower straight balls, turn both down the same amount. Always keep the
dials 35 digits apart.
3. To throw a rising fastball, you must have the lower wheel going faster than
the higher wheel. To throw a sinking fastball, you must have the higher
wheel going faster than the lower wheel.
Figure 5.
Operation
a. Fastball and overhand curve. b. Sidearm curves, lefty or righty.
c. Right-handed curves or sliders. d. Left-handed curves or sliders.