by raumfahrtagentur, published
The Geneva Wheel is a simple mechanic base unit for converting a continuous rotation motion into an intermittent rotary motion. See http://en.wikipedia.org/wiki/Geneva_wheel Its used in clocks and similar mechanics.
We lasered it from 4mm cottonwood plywood. Assembled with a few M3 screws. Scale as needed to fit the screews that you have around.