robolink® D articulated joints are motor-driven slewing ring bearings (iglidur® PRT) in a plastic housing. The main component is a worm gear The center borehole remains free for feeding cables etc through. The articulated joints can be ordered with or without motor. We currently offer igus® stepper motors as possible drives. Other motors are will be available in the future. The robolink® D articulated joints are available in 3 sizes.