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Gear Ratio
Gear Ratio  
Ratio of the numbers of teeth on mating gears. Ordinarily the ratio is found by dividing the number of teeth on the larger gear by the number of teeth on the smaller gear or pinion. For example, if the ratio is 2 or “2 to 1”, this usually means that the smaller gear or pinion makes two revolutions to one revolution of the larger mating gear.

Whereas:
From Gear Data

Formula:

 

 

 

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