The output wheel turns only while the blue drive pin engages a radial slot. Each input revolution advances one slot, followed by a dwell. Changing the slot count changes the index angle and the moving and stationary durations.
At 1×, 15 rpm takes 4 seconds per cycle. Playback scale changes elapsed time only, not the motion relationship. Drawing scale stays fixed during playback.
Change blue values → use the button to return to the drawing
C: 10–10,000 mm; N: integer 4–12; speed: 0.1–3,000 rpm. Crank radius is set automatically from C and N.Blue input speed is constant. Red output accelerates, decelerates, then stops. Watch the red marker stay still after the pin leaves the slot.
An external Geneva mechanism with radial slots. For slot count N and centre distance C, crank radius is set to r = C sin(π/N), giving zero output velocity at entry and exit. Index angle is 360°/N. Dwell assumes a locking mechanism, whose disc is omitted. Wheel outline, pin diameter and slot width illustrate connectivity and are not manufacturing geometry. Friction, impact, load capacity and collisions are not calculated.
