D. Module
Module can be defined in the normal, the transverse, or
the axial planes depending on the design approach employed
and the type of gear being designed, is typically an input
value into the gear design. It is given by
Where, d is the outside diameter, D Z is number of teeth,
is addendum coefficient, for a standard gear =1. m is
an estimated value, compare it with the standard in GB1357-
87 of standard module series, the closest value is the gear’s
module.