Abstract: The apparatus according to the invention, for clamping crankshafts in working machines, is addressed to the problem of being able to clamp the workpieces in a defined position, reproducibly and without distortion, even in the case of different rough crankshaft forgings and varying clamping forces. This is made possible by clamping the workpiece not only between centers but also with two additional devices, the crankpins and cheeks of the workpieces being positioned by oppositely acting hydraulic plungers transversely of the long axis of the workpiece, while these two additional clamping devices are housed in a ring which rotates with the workpiece and which is supplied during rotation only through internally present energy accumulating systems.

Abstract: A crankshaft turning machine operating on the dual cam principle, in which the gyro cutterhead (51) is carried in an internal eccentric cam (11) and the latter in an external eccentric cam (15) rotatable in a housing, both cams being adjustable as to their mutual position. For purposes of avoiding the creation of flattened portions at the crankpins to be machined at the transition from the plunge cut to the circular feed, the design is such that the transition from the plunge cut turning process to the circular feed turning process takes place without any feed stop phase.

Abstract: An external milling machine for the machining of planar, shallowly curved, or circular workpiece contours, consisting of a gyro cutterhead which is rotatably mounted in an internal cam, which in turn is rotatably mounted in an external cam, which in turn again is rotatably mounted in a casing, both of the cams being variable in their position with respect to one another. To enable the machining to be done while the workpiece remains stationary, and to make it as independent as possible of the radius of curvature of the contour being machined, that is, to guide the workpiece [sic] along a course equidistant from the contour being machined, the gyro apparatus is constructed such that the external cam and/or the internal cam are drivable, and such that the casing together with the internal and external cams is displaceable along at least a straight line perpendicular to the workpiece axis.

Abstract: The invention relates to a machine for machining crankshafts, which operates according to the gyrocutter principle, and which has two machining units and one corresponding clamping device each. In order to be able to provide optimum clamping even for unstable workpieces, such as crankshafts, for example, in which the main journal and crankpin spacing is small, and to catch the chips that are formed and evacuate them easily, the two clamping devices support the crankshaft tightly at the same main journal while two crankpins are being machined.

Abstract: The invention relates to a power-driven steady rest for lathes, especially crankshaft turning machines, having a drive gear encompassing the workpiece, in which there is disposed a chuck for holding the workpiece and which is held on both sides adjacent the outer circumference by a bearing in a supporting plate fastened to the machine bed. The drive gear bearing is improved with regard to load bearing capacity and rotatory speed capability by the fact that the bearing consists of individual roller bearings, each of which is formed of a roller and a roller holder fastened to the supporting plate.

Abstract: The present invention relates to a tool machine of a known type in which a crankshaft is machined by a rotary annular tool having internal cutting edges located on at least one circle through which the crankshaft extends. The crankshaft is held by means mounted on the bed of the machine in stationary condition. A slide on this bed movable in a direction parallel to the crankshaft carries a tool unit which is movable on the slide to a cutting position in which said circle is located in a tangential relationship to the pin of the crankshaft being cut and to a loading and unloading position in which said circle is brought to co-axial relationship with the main axis of the crankshaft. When the tool unit is in this position, it may be moved by the slide to such a position close to one of the columns on the bed that the tool surrounds a substantially cylindrical projection on the column carrying the end of the crankshaft.

Abstract: A lathe for simultaneously machining the line bearings of a crankshaft is provided with a turret shaft rotatably mounted on a cross slide for rotation about an axis parallel to the spindle axis. This shaft carries a plurality of turrets each turret being provided with a set of cutting tools on its periphery and being fixed to the turret shaft. Upon withdrawal of the turrets from the workpiece the turret shaft can be indexed to thereby bring the next set of tools into position preparatory to the inward feed of the turret shaft for engagement of the tools with the crankshaft. Two sets of such turrets can be provided on opposite sides of the spindle axis for simultaneous cutting operation on opposite sides of each line bearing of the crankshaft.

Abstract: The present invention relates to a tool machine of a known type in which a crankshaft is machined by a rotary annular tool having internal cutting edges located on at least one circle through which the crankshaft extends. The crankshaft is held by means mounted on the bed of the machine in stationary condition. A slide on this bed movable in a direction parallel to the crankshaft carries a tool unit which is movable on the slide to a cutting position in which said circle is located in a tangential relationship to the pin of the crankshaft being cut and to a loading and unloading position in which said circle is brought to co-axial relationship with the main axis of the crankshaft. When the tool unit is in this position, it may be moved by the slide to such a position close to one of the columns on the bed that the tool surrounds a substantially cylindrical projection on the column carrying the end of the crankshaft.