We just covered his ball-balancing robot, Paul, only to find his phenomenal six-DOF robot arm in ... done with stepper motors and geared belts, which allow each of Walter’s joints to be driven ...

To get around this, [RoTechnic] moved the wrist stepper motors off the arms entirely. He built a push-pull mechanism that uses braided fishing line to transfer motion to the robot arm’s wrist ...

Maxon has launched a range of back-drivable electromechanical joints for humanoid ... It also operates from 30 to 60V, and is more likely to be found in robot manipulators. Within each is a motor, ...