# Belt wrap and traction
# Scope: Open belt wrap angle on the smaller pulley.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

small = 40 mm
large = 100 mm
center = 200 mm

wrap := pi-2*asin((large-small)/(2*center)) [rad]

check wrap target: wrap >= 150 deg

scenario alternative: small = 32 mm