Abstract: Two separate drive systems for driving a rotary table about an axis of rotation relative to a support member within a predeterminable angular segment. The first drive system can move the rotary table into a starting position and the second drive system is a linear one and has a play-free pre-loaded ball-and-screw spindle drive by means of which the movement of the rotary table is performed within the predeterminable angular segment. The linear drive system can be coupled and uncoupled free from play to and from the rotary table by means of a clamping system, with the linear drive system being connected to the support member and to the clamping system with two play-free joints. A rotary measuring system is mounted at the axis of table rotation to ascertain the table's current angle of rotation.

Abstract: A CNC machine for producing spiral-toothed bevel gears is described, which has a first carriage supporting a tool spindle and is displaceable in height, and whose guide is disposed on a lateral surface of a machine housing, which is horizontally guided in a straight coordinate axis on a machine base. The tool spindle axis is parallel with the lateral surface and with the coordinate axis. Furthermore, the machine has a workpiece spindle support having a second carriage and a pivoting device with a vertical axis and is also horizontally guided on the machine base. The parallel arrangement of the tool spindle axis results in a new machine concept with a compact structure and optimal chip flow. Therefore the machine is particularly suited for heavy-duty dry milling. Since the tool spindle is not located above the area of the machine having a horizontal guide, it is possible to arrange a chip collector underneath the tool spindle, which can be reached by the chips essentially under the force of gravity.