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  A two-stage gear reducer using identical pinion and gear sets for the high-speed and lowspeed stages (similar to the Figure above) is to be used between a 7.5 kW, 2700-rpm motor and a 300-rpm load. The center distance is to be 204 mm. The motor involves “light shock” and the driven machine “moderate shock.” The shafts and their mountings correspond to ordinary good industrial practice, but not to “high-precision” industrial practice. Design the gears for a life of 107 cycles with 99% reliability and a safety factor of 1.2. Determine an appropriate combination of module, face width, level of manufacturing precision, and material.

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