In a reverted gear train, as shown in Fig. 13.32, two shafts A and B are in the same straight line and are geared together through an interme- diate parallel shaft C. The gears connecting the shafts A and C have a module of 2 mm and those connecting the shafts C and B have a module of 4.5 mm. The speed of shaft A is to be about but greater than 12 times the speed of shaft B, and the ratio at each reduction is same. Find suitable number of teeth for gears. The number of teeth of each gear is to be a minimum but not less than 16. Also find the exact velocity ratio and the distance of shaft C from A and B.

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A set of gears is used to reduce the speed from an electric motor to a shaft driving a grocery checkout conveyor, depicted below. The gear on the motor shaft is a 10-pitch pinion, has 18 teeth, and drives at 1200 rpm clockwise. The driven gear has 72 teeth. The motor has failed and is to be replaced with the only motor available, a 600 rpm motor with an 8-pitch pinion. Specify the set of commercially available 20⁰ spur gears, by number of teeth (N3and N4), that would result in the same conveyor speed and can be used without modification to the mounting (the center distance must not change). Find  the number of teeth N3 on the pinion (drive) gear (teeth): Find the number of teeth N4 on the driven gear (teeth):

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