# Open-belt length and center distance
# Scope: Open-belt approximate length; pulley radii small relative to centers.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

diameterA = 40 mm
diameterB = 80 mm
center = 200 mm

length := 2*center+pi*(diameterA+diameterB)/2+(diameterB-diameterA)^2/(4*center) [mm]

check separated pulleys: center > (diameterA+diameterB)/2

scenario alternative: diameterA = 32 mm