A gear wheel can be fully defined with as few as two parameters: the number of teeth (z) and module (m). The latter is simply the reference diameter divided by the number of teeth. Changing the other two parameters (α and x) is not recommended.

Basic Dimensions

Item	Symbol	Value
Module	m
Number of teeth	z
Pressure Angle (°)	α
Profile shift	x
Reference diameter	d
Base diameter	db
Base radius	db / 2
Tip diameter	da
Tooth thickness at base (°)	ψb

Tooth Profile (Involute Curve Equations)

X equation
Y equation
Z equation
U min
U max
U step
U wrap	unchecked
V min
V max
V step
V wrap	unchecked

Related: How to Model Involute Gears in Blender