A spur gear with 42 teeth is driven by a pinion with 14 teeth turning 420 RPM. What is the speed of the driven gear?

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Multiple Choice

A spur gear with 42 teeth is driven by a pinion with 14 teeth turning 420 RPM. What is the speed of the driven gear?

Explanation:
When two spur gears mesh, the speed of the driven gear is inversely related to the number of teeth on it. The pinion has 14 teeth and drives a gear with 42 teeth, so the driven gear has three times as many teeth. That makes it rotate at one third of the pinion’s speed. 420 RPM divided by 3 equals 140 RPM.

When two spur gears mesh, the speed of the driven gear is inversely related to the number of teeth on it. The pinion has 14 teeth and drives a gear with 42 teeth, so the driven gear has three times as many teeth. That makes it rotate at one third of the pinion’s speed. 420 RPM divided by 3 equals 140 RPM.

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