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##### Asked by: Alimatou Kaempf

business and finance mechanical and industrial engineering industry# How do you calculate gear reduction?

**reduction**” or

**gear**ratiois calculated by dividing the number of teeth on thelarge

**gear**by the number of teeth on the small

**gear**.Forexample, if an electric motor drives a 13-tooth pinion

**gear**that meshes with a 65-tooth

**gear**, a

**reduction**of 5:1is achieved (65 / 13 = 5).

Also asked, what is a gear reduction?

A **reduction gear** is an arrangement by whichaninput speed can be lowered for a requirement of sloweroutputspeed, with same or more output torque.

**output**gear bythediameter of the input gear. Multiply the

**torque**of themotorby the gear ratio to get the

**output torque**. Forexample, amotor that puts out 10 lb.-feet of

**torque**usedwith a gearreducer with a 10:1 gear ratio will give you 100lb.-feet of

**torque**at the

**output**gear.

Similarly, you may ask, how do you calculate gears?

Divide the number of teeth on each "driven"**gear**by the number of teeth on the "drive" **gear** foreachinterlocking set of **gears** to **calculate**theintermediate **gear** ratios. In our example, theintermediate**gear** ratios are 20/7 = 2.9 and 30/20 =1.5.

The output**gear**of a **speed reducer** has more teeth than theinput**gear**. So, while the output **gear** might rotatemoreslowly, reducing the **speed** of the input, the torqueisincreased. So, to sum up, they take an input power sourceandincrease the torque while decreasing the**speed**.