Module is the unit of size to indicate how big or small a gear pinion is. It is the ratio of the reference diameter of the gear pinion divided by the number of teeth. Thus the formula of module calculation is as following:
- Module ( M ) = Reference Diameter ( R d ) / Number of Tooth ( N t )
- Reference Diameter (R d) = Reference Diameter ( R d ) / Module ( M )
- Reference Diameter (R d) = π x Module ( M )
For Example: Module 1.5 = 1.5*3.1415926 = Pitch 4.7124 mm
The table presents the method for calculating the mesh of a rack with pinion：
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