InputCouplerOutput
1× uses the entered speed: 15 rpm takes 4 seconds per turn. Drawing scale fits the frame and stays fixed during playback.
- Input angle
Four-bar linkage: rotation into rocking
A four-bar crank-rocker turns rotation into a back-and-forth swing, as in a wiper-like motion. Even with uniform input, output speed changes. Adjust pivot spacing d and lengths a, b and c to inspect the output swing and the path of P.
Linkages
Cam & intermittent motion
Change dimensions & drive
Length unit: mm
Playback controls sit directly below the drawing. Editing pauses playback.
What to watch in this mechanism
A four-bar crank-rocker turns rotation into a back-and-forth swing, as in a wiper-like motion. Even with uniform input, output speed changes. Adjust pivot spacing d and lengths a, b and c to inspect the output swing and the path of P.
Blue is the prescribed input, green is the connecting link and red is the output. Change the blue dimensions, then use the button to return to the drawing. This page calculates motion, not the required motor force or torque.
Compare the ten mechanism types →