Abstract: A numerically controlled lathe with a stationary headstock and a work spindle, mounted rotatably in the headstock, for holding a work in a first clamping includes a counter spindle for holding rotatably the workpiece in a second clamping. The lathe also has a tool turret, which can be indexed around an axis and which is mounted on a first slide, movable in two directions that are perpendicular to each other. This first slide also supports the counter spindle. A second tool holder is mounted next to the work spindle. The counter spindle and the tool turret are mounted on the first slide in mutually variable configuration; and the second tool holder is mounted on a second slide, which can be moved at least in a direction perpendicular to the work spindle axis. This second tool holder holds two groups of tools, one of which is mounted and designed for machining the work at the work spindle and the other is mounted and designed for machining the work at the counter spindle.

Abstract: A turning machine has a spindle box, a workpiece spindle rotatably supported in the spindle box and having at its on end a clamping device for clamping rod-shaped workpieces, a tool holder arranged displaceably transversely to an axis of the workpiece spindle, a guiding bushing support, and a workpiece guiding bushing rotatably supported in the guiding bushing support so that the guiding bushing is oriented coaxially with the axis of the workpiece spindle and exchangeably mounted in the guiding bushing support. The workpiece spindle displaces the guiding bushing in the direction of the axis of the workpiece spindle. The workpiece spindle is sleeve-shaped and extends out of the spindle box over at least a length of the relative movement. The workpiece guiding bushing is exchangeable by the workpiece spindle guiding bushing for receiving the sleeve-shaped workpiece spindle.

Abstract: A drive for workpiece spindle of a machine tool comprises a drive motor to be arranged on the free end of a workpiece spindle, a motor housing, a rotor to be mounted on the workpiece spindle and a stator arranged in the motor housing. The motor housing is connectable with a spindle box and has a motor cover. Cooling medium passages extend between the motor housing and the motor cover, between the rotor and the workpiece spindle and between the spindle box and the rotor.

Abstract: An indexable revolving turret has a rotary tool carrier which is movable to a plurality of angularly spaced indexed positions, and an indexing shaft which is connected with the tool carrier for indexing the same to the respective ones of these positions. Cooperating spur gears are provided on the tool carrier and on the housing and become disengaged preliminarily to indexing of the tool carrier. A control shaft is driven by a drive so as to be rotated by the same and transmits motion to a Maltese-cross drive, an input member of which is mounted on and rotatable with the control shaft. The indexing shaft can be moved axially of itself, thereby moving the tool carrier into and out of indexing position, and for this purpose a cam drum is mounted on the control shaft and the cam follower slides in a cam groove of the cam drum and is connected with the indexing shaft so as to move the same into and out of an indexing position, depending upon the angular position of the cam drum.

Abstract: A multi-station machine tool wherein the bed of the frame supports two spaced-apart upright columns and the columns support an indexible shaft for a turret which is disposed between the columns. The turret has several sets of clamping jaws for elongated rod-shaped workpieces which are introduced and removed at a first station or which are introduced at a first station and removed at a second station. The number of stations may greatly exceed two, and each column supports several spindles including at least one rotary and axially movable tool spindle and at least one axially movable and preferably rotary work spindle. Each spindle in one of the carriers is coaxial with a spindle in the other carrier, and the turret indexes the workpieces in such a way that they come to rest between successive or selected pairs of coaxial spindles.

Abstract: A machine tool wherein the carrier for several rotary work spindles is separably mounted on a base in such a way that the chucks of two spindles are spaced apart by equal distances from horizontal ways for two side slides each of which mounts a carriage for an indexible tool turret. If the treatment of a workpiece at one of the working stations takes up more time than the treatment of a workpiece at the other working station, the tools which have completed the treatment of a workpiece at the other station are moved to the one station to cooperate with the other tools in rapidly completing the treatment of the workpiece at the one station. The carrier may be a box-like structure with two spindles or a drum having more than two work spindles and being indexible in a headstock, which is separably secured to the base.