Abstract: The invention relates to the cutting of rotating surfaces, especially centric symmetric surfaces (1a) of a metal workpiece (1), especially one made of steel or gray cast iron, also when said workpiece is in hardened state, by means of a geometrically determined cutter (2a) or cutters, wherein the axial extension and the material of the surface to be machined are hardly limited or not limited at all and/or the operating time during machining is reduced according to said method and/or the service life of the tool is enhanced and/or the effect of the twist-free condition is achieved, wherein at least one cutter (2a) that is skewed relative to the rotational axis (10) of the workpiece is guided during a feeding motion (3,3?) in a contacting manner on the rotating workpiece and wherein the machining parameters of the rotational axis, especially the forward feed motion in the direction of feeding and the skewed position (x) of the cutter (2a) relative to the longitudinal direction (z), are chosen in such a way that

Abstract: A process for cutting machining of rotating rotationally symmetrical workpieces with a defined cutting edge, wherein the resulting rotationally symmetrical surface has either no twist or a twist which is only insignificant in terms of transport effect and abrasive action and/or when machining the hardened workpiece surfaces a particularly high material removal rate can be achieved, wherein a cutting edge which is askew with respect to the axis of rotation of the workpiece is guided in contacting relationship along the rotating workpiece in a linear feed movement transversely with respect to the axis of rotation, wherein the machining parameters, in particular the broaching feed and the inclined positioning of the cutting edge are so selected that the twist occurring at the machined surface becomes a minimum in respect of twist pitch and/or twist depth and in particular the twist depth becomes a minimum.

Abstract: The invention concerns a method and an apparatus in which crankshafts and similar components can be machined at the relevant machining locations (big-end bearing locations, main bearing locations, side cheek side surfaces, end journal/end flange) on one machine and thus with a low level of expenditure in terms of investment items and nonetheless overall in highly time-efficient manner, by mechanical material removal in one and the same machine, wherein in all machining steps the workpiece is gripped on the central axis and is drivable in rotation and the concentric rotationally symmetrical surfaces are machined by workpiece-based methods.

Abstract: A method of machining rotationally symmetrical parts, in particular crankshafts, in particular the bearing surfaces of crankshafts, until they are in a condition of being ready for use, that is to say the condition in which the crankshaft can be installed in an engine without the further removal of material at the bearing surfaces. The object of the invention is to simplify the removal of material when machining bearing locations of a crankshaft. In the method according to the invention for finishing machining rotary parts, in a condition such that they are ready for use, after the original shaping operation removal of material is effected only by cutting machining with a given cutting edge and subsequent finishing.

Abstract: The invention concerns a machine tool which, in spite of the possibility of being simple and inexpensive to produce, permits a highly variable design configuration and fitment of the machine tool with machine modules and moreover in spite of good chip removal permits a simple energy supply with little susceptibility to trouble, in particular for the lower machine modules. A machine tool according to the invention comprising a bed on which are arranged guides for carrying machine modules is characterized in that the bed is a portal bed which is stood up on at least one bed foot.

Abstract: A method and apparatus for machining workpieces with rotationally symmetrical surfaces, for example crankshafts, by which the setting and idle times are minimised, transposition of the workpiece to another machine is avoided, and both large batch sizes and also small numbers of items are economically machined. Machining of the workpiece is effected both by a method in which the machining speed is produced primarily by the rotation of the workpiece, and also by a method in which the machining speed is achieved primarily by the rotation of the tool.

Abstract: A process for the metal-removing machining of a workpiece, where a disc-shaped external milling cutter is provided having cutting edges positioned on its outer circumference, the workpiece is rotated, and peripheral surfaces of the workpiece are machined with the milling cutter, by rotating the milling cutter to have a cutting speed of at least 180 m/min when roughing and at least 200 m/min when finishing, and a chip thickness of between 0.05-0.5 mm.

Abstract: The invention concerns a method of controlling the machining of a workpiece which moves during the machining operation and on which a plurality of tool units operate simultaneously at different machining locations, in particular for controlling the rotary milling of a rotating workpiece such as for example a crankshaft at a plurality of machining locations (A, B, . . . ) simultaneously by separate tool units (a, b, . . . ), which is characterised in that with knowledge of the optimum motion parameters (nkwa, na, xa, ya, . . . ; nkwb, nb, xb, yb, . . . ) of workpiece (KW) and tool (WZ), which are separate for each machining location (A, B), the speed of motion of the workpiece, in particular the rotary speed (nKWa, nKWb) of the crankshaft (KW) and the speeds of motion (na, xa, ya, . . . ;nb, xb, yb, . . . ) of the tool units (a, b . . . ) are so selected that in the sum (S) of all simultaneously machined machining locations (A, B, . . . ) an optimum machining result is achieved overall.

Abstract: The present invention concerns a method of finishing machining rotary parts which are at least partially subjected to a hardening process until they are in a condition of being ready for use. The rotary parts may be crankshafts, or bearing surfaces of crankshafts, in particular automobile crankshafts. The object of the invention is to simplify the removal of material when machining bearing locations of a crankshaft which is to be hardened. After the original shaping operation, removal of material is effected at most by cutting machining with a given cutting edge.

Abstract: The problem addressed by the invention is to provide a milling machine which can be used to machine eccentric end faces and peripheral faces and which ensures a short machining time despite its simple design. A milling machine of this king for machining workpieces and with means of clamping eccentric end faces or enveloping surfaces, e.g.

Abstract: The invention relates to a process and a device for machining of workpieces (10) like crankshafts or similar components which are rotated about their own axis during machining, at least two mutually independently operating rotary milling tools (15, 16, 21, 22) performing material-removing operations simultaneously at different points on a workpiece. In order to maximize the edge life of the tools used, with special regard to the most uniform wear possible on all the rotary milling tools, it is proposed that the rotation speed of the tools be matched or varied to provide an optimum cutting operation and the rotation speed of the second and any other rotary milling tool be controlled dependently upon the tool rotation speed predetermined by the matching or variation.

Abstract: The invention discloses a method of machining workpieces such as crankshafts, camshafts or similarly shaped members, having surfaces which are disposed both concentrically and also eccentrically relative to a workpiece axis and which are rotationally symmetrical or approximately rotationally symmetrical. The machining of the concentrically curved surfaces is effected by means of turning, rotational broaching and/or turning-rotational broaching and the machining of the eccentric workpiece surfaces is effected by means of end-milling wherein the axis of rotation of the milling cutter is transverse with respect to the spindle axis 3, and the workpiece is subjected to cutting finishing machining and the clamping means.

Abstract: A machine and a process of using the machine for turn-broaching a workpiece to for crankshafts or camshafts. The machine comprises turn-broaching units having peripheral cutters whose cutting surfaces are monitored and automatically adjusted to compensate for wearing. The angular positions of the cutters of a turn-broaching unit may also be offset with respect to one another such that only one cutter is in contact with the surface of the workpiece at each instant.

Abstract: A turret lathe table having tool holders arranged on at least three concentric reference circles around the center of the table. The tool holders consist of first tool holders for drill tools and inner turning tools and second tool holders for outer turning tools. The first tool holders are arranged exclusively on the innermost and at least one intermediate reference circle, while the second tool holders are arranged only on the outermost reference circle. The spacing between the tool holders is such that a collision-free diameter remains between adjacent tool holders, the collision-free diameter being defined as a diameter equivalent to a workpiece of maximum dimensions capable of being machined by a respective tool in a respective tool holder without interference from tools in adjacent tool holders.

Abstract: A gearing system for a lathe is shiftable from a first position, in which conical gear wheels (16, 25, 26, 36) engage each other with play, to a second position, in which the wheels engage each other without play. Reduced wear is achieved in the first position. High precision is achieved in the second position. Preferably, the system also has parallel-toothed gear wheels (15, 24, 35) which are engaged when the conical gear wheels are disengaged.

Abstract: A turn broaching machine can be used either as a single turn broaching machine or as a set turn broaching machine with a minimal retooling expense by employing two independently movable tool supports into which either a single turn broaching tool or a turn broaching tool set can be inserted, where the ends are designed so they are suitable for chucking in the chucks of the two tool supports.

Abstract: The invention pertains to a process and an apparatus for machining axially symmetrical parts on lathes or rotary broaching machines in which the workpiece is held at each end by an axial clamping pin and a clamping jaw assembly, the clamping pins and clamping jaw assemblies cooperating such that the clamping jaw assemblies may be retracted relative the clamping pins when the ends of the workpiece are being machined and may be extended relative the clamping pins when additional support for the workpiece is desired, as, for example, when the central portion of the workpiece is being machined. The clamping pins and clamping jaw assemblies are movable relative each other and relative the workpiece such that machining of both ends of the workpiece may take place simultaneously or sequentially, followed by machining of the central portion of the workpiece, on a single apparatus and as part of a continuous, uninterrupted machining sequence.

Abstract: Lathes usually have only two axes of movement for the tool, namely the directions of the displacement of the saddle and cross rest. Since power-driven tools are increasingly being used, especially in NC lathes, in which radial and axial slotting is performed on the workpiece with end mills, for example, there is a need, for example, to vary the width of the slot by slightly shifting the tool in a third direction perpendicular to the first two directions of movement. Precisely in the case of slotting, no continuous adjustment is necessary, as it would be very costly to achieve mechanically. Instead it is sufficient to be able to reach two or three fixedly specified, changeable positions. This can be achieved by an arcuate movement of the tool which will also contain components of the desired third direction of movement, and this can be achieved mechanically either by rotating a part of the tool head or by an eccentrically configured tool socket.

Abstract: The present invention relates to a guidance system on a machine, especially a machine tool, consisting of a twist-resistant, vibratioin damping support body, of concrete for example, and at least one body fastened thereon or integrated therein, which is not of itself twist-resistant, and which forms the guidance ways. In order to endow such guidance ways with minimal thermal expansion and elasticity, make them very hard, give them good low-lubrication running characteristics, and enable them to be manufactured simply and very accurately, the body forming the guidance ways consists of sinterable nonmetals, especially ceramic material.