KUKA linear units are translational motion units Linear units can be used to extend a robot?s work envelope or alternatively to move workpieces or tools within the work envelopes of a number of robots. This allows applications such as the tending of more than one machine or fixture, order picking from rows of pallets, or work on very large components. Control of the linear unit is integrated as a mathematically coupled axis in the robot controller, dispensing with the need for an additional controller.