A 72-tooth gear is connected to a 12-tooth gear. If the large gear makes one complete turn, how many turns does the small gear make?
Answer (3)
You divide 72 by 12 to get 6.
When connecting gears with different numbers of teeth, the speed of rotation is inversely proportional to the number of teeth. In this case, if a 72-tooth gear (the driven gear) is connected to a 12-tooth gear (the driver gear), every complete turn of the larger gear would result in the smaller gear making more turns. We calculate the number of turns by dividing the number of teeth on the driven gear by the number of teeth on the driver gear. Thus, the 12-tooth gear would make 6 full revolutions for every complete turn of the 72-tooth gear.
The small gear makes 6 full turns for every complete turn of the large gear. This is calculated by dividing the number of teeth on the large gear (72) by the number of teeth on the small gear (12). Therefore, the small gear rotates 6 times when the large gear makes one complete rotation.
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