1.       Design a two-stage compound spur gear train for an overall ratio of approximately 47:1. Specify tooth numbers for each gear in the train.

2.       Design a three-stage compound spur gear train for an overall ratio of approximately 656:1. Specify tooth numbers for each gear in the train.

3.       An epicyclic spur gear train as shown in Figure 12-16 (p. 700) has a sun gear of 33 teeth and a planet gear of 21 teeth. Find the required number of teeth in the ring gear and determine the ratio between the arm and sun gear if the ring gear is heldstationary. Hint: Consider the arm to rotate at 1 rpm.