Engineering
The crank drives a guided piston through a connecting rod. Compare stroke, speed and load at finite motor torque.
Rigid bodies with revolute and prismatic constraints in one 3D solver. No combustion, bending or bearing friction. The load opposes slider motion.
Equations x = r cos θ + √(l² − r² sin²θ); τmotor is bounded
Engineering
Run a Scotch yoke and a slider-crank from the same crank: equal strokes, but only the yoke moves as a pure cosine. Shorten the connecting rod and watch the difference grow; load the outputs and compare the crank torque.
Engineering
Compare three smooth lift laws and raise the speed until the roller leaves the cam; then stiffen the spring until contact returns. The contact can only push, so a lift-off is computed, not drawn.
Engineering
The groove round the drum moves the carriage out, holds it, brings it back and holds it again. Shorten the rise and watch the groove lean steeper and the drum torque climb; give the roller more friction and see the load drive the drum back on the return only while the groove is steep.