JUGS Sports Combo (2 wheel) Pitching Machine - Manual (Page 23)

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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 6a) 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 7. 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.
Operation
Figure 6
a. Fastball and overhand curve. b. Sidearm curves, lefty or righty.
c. Right-handed curves or sliders. d. Left-handed curves or sliders.