Spur Gear Formulae and Nomenclature
P
=
N
d
p
=
πd
N
m
=
d
N
, mm
Where,
Symbol
Definition
P
diametral pitch
N
number of teeth
d
pitch diameter
p
circular pitch
m
module, for metric system only
Equation variations based off of the above equations
N
=
πd
p
N
=
Pd
π
=
pP