Abstract
This chapter presents the methods that are useful for estimating gears. It discusses the most common gear application of reducing motor speed to machine speed. The necessary gear ratio is the ratio of the motor speed to the machine speed. The magnitude of the required ratio may affect the type of gear or gear arrangement. The most common arrangement is to use spur or helical gears on parallel shafts. If the required ratio is greater than the recommended ratio for a single set, then a number of sets in series are used with the total ratio being the product of the individual gear set ratios. Most gears are made of alloy steel. The main criteria for selecting material are the fact that the load capacity of the gear set is proportional to the hardness of the material. There are two major material categories: surface-hardened and through-hardened.
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