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Earlier we described that when two gears mesh, the smaller one is known as the pinion. A rack is a straight bar with equipment enamel that meshes with the pinion. So you can almost certainly picture how rack and pinion gears are employed to transform rotation into linear movement. A best example of this is the steering method on many autos. The steering wheel rotates a equipment, which engages the rack. As the equipment turns, it slides the rack both to the proper or remaining, based on which way you turn the wheel.