Q. In gears the ratio of pitch circle diameter in millimeters to the members of teeth is called:

A
Pitch circle
B
Circular pitch
C
Diametral pitch
D
Module
Solution:

In gears the ratio of pitch circle diameter in millimeters to the members of teeth is called module. “Module” is the unit of size that indicates how big or small a gear is. It is the ratio of the reference diameter of the gear divided by the number of teeth. The module describes the size of a gear. A pair of gears can only mesh correctly if and when the base pitch is the same.

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