Direction of Rotation

In the previous section the examples illustrated that one use of power trains is to change the speed between two or more shafts or components. Another function of mechanical power trains is to change the direction of rotation. In many applications, a shaft or component may need to turn in the opposite direction as the driver. The two directions of rotation are labeled clockwise (CW) and counterclockwise (CCW) when viewed from the end of the shaft. The direction of rotation can be changed through the use of belts and pulleys, chains and sprockets, and gears. Each of these methods will be illustrated.

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