The invention relates to a device (1) for mechanically rough and or finish machining workpieces, especially flash trimming cast parts. The device has at least one multiaxial robot (2) or manipulator for this purpose. The robot or manipulator supports at least one tool for machining workpiece(s). The device (1) is also provided with a clamping device (5) for holding the workpiece or cast part to be machined. The provision of a magazine (6) for multiple exchangeable tools is also advantageous. The process of changing tools on the robot (2) is preferably program-controllable. At least two clamping devices (5) are preferably provided on a common support device (7), facing away from each other, the support device (5) being located in an approximately vertical plane and being able to pivot or rotate about an axis extending between the two clamping devices (5), so that while one workpiece or cast part is being machined, a new workpiece or cast part can be clamped on the opposite side and this workpiece changeover point is separate and shielded from the machining point.