Speed reducers, also known as gearboxes or gear reducers, are enclosed mechanical devices that use gear trains to enhance the torque and lower speeds on a drive between a motor and a piece of machinery. A gear reducer is a mechanical system of gears in an arrangement such that input speed can be lowered to a slower output speed but have the same or more output torque. The operation of a gear reducer involves a set of rotating gears that are connected to a shaft with a high incoming speed, which is sent to a set of rotating gears where the speed or torque is changed. How many gears are in a gear reducer assembly is dependent on the speed requirements of the application.