Image result for robot ball joints | Robot art, Tv head, Robot
Active Ball Joint Uses Spherical Gear | Hackaday
James Webbon - Ball joint mech
Lego Robotic Arm - Ball Joint Concept - YouTube
I designed this ball end joint for my portal-robot, but it can also be usefull for other robotics projects. it is 3D-printed, and utilizes air gun balls to reduce friction. A springloaded