# Gear center distance
# Scope: External spur pair with matching module.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

module = 2 mm
teethA = 20
teethB = 40

distance := module*(teethA+teethB)/2 [mm]

check center distance budget: distance <= 70 mm

scenario alternative: module = 1.6 mm