# Crank-rocker feasibility
# Scope: Link length screening for a Grashof crank-rocker; fixed link choice remains explicit.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

crank = 20 mm
coupler = 60 mm
rocker = 50 mm
ground = 40 mm

margin := ground+rocker-crank-coupler [mm]

check length screening: margin >= 0 mm

scenario alternative: crank = 16 mm