The drums shown below are the central point for the movement of the owls heads. Through the centre of each of the drums will be a 1/4" dowel that rises up through the owl's body to the head. As the drum turns, so too will the dowel and head. The drum has two channels for cables, one for the "pull" and one for the "pull back". Each will have a cable termination and the cables will run in opposite directions to impart opposing motion.
Automata is a creative blend of my life interests , engineering, art and woodworking.