A machine tool for machining workpieces having at least in parts of wood, wood materials, plastic, composite material or the like, includes: a machining unit for performing workpiece machining, a supporting table for supporting workpieces to be machined, and an assistance robot which is arranged at least temporarily on or above the supporting table and which includes a transport device that enables it to move with respect to the supporting table. A navigation system including at least one sensor is provided for navigating the assistance robot with respect to the supporting table.