Abstract: A machine tool is provided with an arrangement for increasing its precision by compensating for deviations in tool positioning caused by factors, such as elastic deformation of the machine structure, which vary in their effect in dependence on the current working state of the machine tool. The arrangement includes a compensator device arranged to physically act upon the machine tool to cancel at least one deviation component, and signal processing means controlling the action of the compensator device in dependence on the current machine working state as sensed by a plurality of transducers. The signal processing means stores data interrelating the machine working state to a corresponding appropriate magnitude of action of the compensator device.

Abstract: The present invention is directed to a milling machine, including a base member, a substantially vertically disposed element which is horizontally adjustable along said base member, a clamping platform disposed adjacent the base member, a machine head which is vertically adjustable along the vertically disposed element, a tubular ram mounted in the machine head, said tubular ram being adjustable transversely to the vertically disposed element, toward and away from the clamping platform, a milling tool spindle adapted to rotate around its longitudinal axis and a drive means for rotation of the milling tool spindle and for integrally moving the ram and spindle away from and toward the platform.