The green and orange wheels of Archimedean grooves are identical. Input is the green wheel.
The pink pin slides in both grooves and in a straight slot of an immobile bar.
If the bar is not perpendicular to the line connecting axes of the two wheels, the orange wheel has irregular rotation.
The output will be diversified with various positions of the bar, various pitches of Archimedean grooves of the input and output wheels.