Where there are two gears of different sizes, the smaller gear will rotate faster than the larger gear. The difference between these two speeds is called the velocity ratio, or the gear ratio, and can be calculated using the number of teeth. The formula is
Gear ratio = the number of teeth on the driven gear divided by the number of teeth on the driver gear.
Example:
Gear ratio = 60 ÷ 15 = 4.
In other words, the driver gear revolves four times to make the driven gear revolve once.
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