# Wheel and axle: turn a large wheel to pull on a small axle
# Scope: Ideal rigid coaxial wheel and axle; tangential forces, no friction.
load = 100 N
wheelRadius = 100 mm in 80..200
axleRadius = 25 mm in 10..50
effort := load * axleRadius / wheelRadius [N]
mechanicalAdvantage := wheelRadius / axleRadius
part wheel "Wheel": cylinder wheelRadius, 10 mm at 0 mm, 0 mm, 30 mm
part axle "Axle": cylinder axleRadius, 60 mm
check hand force: effort <= 30 N
scenario larger wheel: wheelRadius = 150 mm