Abstract: Multispindle-automatic turret lathe comprising a spindle support which is rotatable about a central switching or indexing axis and in which are rotatably mounted a number of work spindles each defining one switching or indexing station of the spindle support.In order to enable the tools which are fitted on the turret being precisely measured in that position thereof in which the tools are required to work a measuring station is provided on the spindle support in like geometrical relation to the indexing axis as the workspindles, said measuring station defining a further switching or indexing station of the spindle support.

Abstract: Method for producing threads and machine tool for thread milling, wherein in order to avoid high cutting speeds and also to produce short millings, a milling cutter is used, which comprises several teeth forming at least one thread, rotates at the point of engagement in the opposite direction to the workpiece, encompasses the latter during the production of an external thread with substantial radial play or in the production of an internal thread is encompassed by the workpiece with substantial radial play, and wherein the advance s of the milling cutter meets the following condition:s=h.multidot.(1-i)with h representing the pitch of the thread to be produced and i the rotational speed ratio of milling cutter and workpiece differing from 1.

Abstract: A method for rough-turning and finishing a workpiece on a lathe wherein the lathe is provided with a tailstock center which is axially displaceable, a further center on the work spindle as well as axially displaceable front drivers and a chuck so that, for rough-machining, the workpiece is lifted off the work spindle center by means of the front drivers and driven by the chuck whereas, for finish-machining, the workpiece is held between the centers and driven by the front drivers.

Abstract: Automatic turret lathe with a synchronous spindle in the tool turret which is drivable in synchronism with the main spindle and comprises a workpiece chuck means. To enable workpieces to also be worked on the rear side, i.e., on the side on which they were severed from a stock rod, while the next workpiece held in the main spindle is already being machined with the aid of a further tool carrier, a third tool carrier is arranged on the side of the tool turret mounted on a compound slide system facing away from the main spindle.

Abstract: NC automatic turret lathe with a tool turret, in which an auxiliary spindle is rotatably mounted. In order to position this auxiliary spindle with respect to its angle of rotation, an angle of rotation sensor device which controls a drive motor for the auxiliary spindle and an activatable locking device designed in the form of a freewheel are provided for the auxiliary spindle so that it may be positioned, with respect to its angle of rotation, accurately and free from play by reversing the auxiliary spindle drive motor once the locking device has been activated.

Abstract: Multispindle-automatic turret lathe with a spindle support mounted for rotation about a central indexing axis on a headstock and in which are mounted several workspindles, and with a main driving motor for a drive shaft which is adapted to be drivingly coupled with that workspindle which at any given time occupies the working position.Since it is regular custom to provide such main driving motors with electronic control units which not only control acceleration and deceleration of the workspindle which happens to be driven at any given time but which also allow the latter being stopped precisely in a clearly predefined angular position, a separate drive for the spindle support may be dispensed with by coupling the spindle support with the main driving motor for its intermittent indexing rotation movement.

Abstract: A feeding system for barstock on turning machines with a support extending in the feeding direction and with a plurality of holders for holding and slidably guiding a material bar. The holders are slidably guided in the feeding direction on the support and are interconnected by coupling means provided by intersecting links which are pivoted relative to each other and to the holders such that the latter are maintained parallel to each other and can be pushed together and moved apart in the longitudinal direction of the material bar.

Abstract: The arrangement for loading and unloading workpieces of machine tools includes a pair of spaced loading arms supported on a carriage for pivoting about a first axis. A pair of spaced unloading arms are also supported on the carriage above the loading arms for pivoting about a second axis parallel to the first axis. Each arm carries a gripper for the workpiece, and each pair of grippers is movable by the associated arms along an arcuate path between an initial position and an end position. The initial positions of the two pairs of grippers are different but the end positions are common. The carriage is movable from a workpiece magazine, where the loading arms pick up an unmachined part and the unloading arms subsequently release a machined part, to a position within the work space of the machine where the unloading arms pick up the machined part and the loading arms subsequently position the unmachined part for machining.

Abstract: A mechanism for loading and/or unloading automatic lathes. A feed device having a transport means is provided for feeding a workpiece to a transfer station. The feed device is associated with a pivotable carrier member and includes means for gripping the workpiece.

Abstract: An automatic turret lathe has a main and a supplementary tool-carrying turret both being jointly movable in longitudinal and transverse directions with the turrets being indexable about an indexing axis. The supplementary turret is of smaller diameter than the main turret. Turning tools can be placed in the turrets so that a tool in one turret forms a pair with a tool in the other turret, and the turrets arranged so that both inside and outside machining of a workpiece can be carried out simultaneously. Tools can be placed in the carriers in the turrets to carry out a particular desired function. The supplementary turret can be removed for machining shafts. The turrets can be moved towards and away from as well as along the lathe axis.