Abstract: In connection with machine tools it is frequently necessary to directly couple the motion sequence of a tool carrier and thus of the tool carried by the tool carrier, to the r.p.m. of a work piece, in order to perform certain motion sequences for each revolution of the work piece. In connection with machine tools in which the r.p.m. of the work piece depends on the work piece diameter, for example, in underfloor wheel set turning machines or turning machines, the r.p.m. is not known. Additionally, the unknown r.p.m. changes during the work piece machining. In order to achieve a synchronization in spite of the changing unknown r.p.m., the time necessary for performing one revolution of the work piece is measured and the time measurement is converted into a control signal for influencing the motion of the movable member such as the tool carrier in such a way that the motion of the tool carrier is influenced as a function of the measured time duration.

Abstract: The known turn broaching of crankshaft main bearings is not suitable for broaching crankshaft bearing pins for the connecting rods because that would require locating the rotational axis of the crankshaft in the connecting rod bearing pins, whereby the crankshaft would rotate eccentrically. The resulting unbalances prevent driving the crankshaft with the r.p.m. required for the turn broaching operation. To avoid this problem a broaching lathe for the rotational or turn broaching of crankshaft connecting rod bearing pins is equipped with a steady rest including a rotating support device which permits mounting the crankshaft in the lathe in such a way that the rotational axis coincides with the axis of the connecting rod bearings of the crankshaft.

Abstract: The diameter of railroad wheels is calculated from data obtained by simultaneously producing two marker points on the tread surface of the wheel and simultaneously sensing these marker points and from data representing the known fixed location of the marker point generators and of the sensors. These data define a chord line and a chord height subtending the chord line. The length of the chord line and chord height in turn define the wheel diameter. A computer performs the calculations and provides a respective output that may be used for display or for controlling a tool such as a wheel truing machine.

Abstract: A broaching tool is provided with at least nine cutting tool edges arranged at its circumference. The cutting tool edges cover only a certain sector along the circumference of a tool disk while leaving another sector between a first and last cutting tool edge free of cutting tool edges. This feature enables moving a tool axially relative to a work piece without first moving the tool radially relative to the work piece. Further, the tool can be moved radially without damage. These movements are performed when the sector without cutting tool edges faces the work piece. This sector without cutting tool edges has an opening angle of less than 180.degree. and it provides a spacing and free space relative to a work piece. Thus, work piece surfaces that have been machined by the cutting edges, are free of these cutting edges if and when the other sector faces the work piece.

Abstract: A method and apparatus measure or gage worn railroad wheel profiles for the purposes of ascertaining the location of the new profile relative to the worn profile. The new profile is to be produced by a reprofiling operation such as a truing. For this purpose characteristic points on the worn profile are contacted in a radial and axial direction by a sensor and the respective displacement of the sensor is measured or gaged relative to a zero or null point. The location of the sensed points is then compared in a computer with a given reference location on a corrected profile. The corrected profile is then contacted with the sensed or gaged point which will make it possible to restore a correct profile with the least possible material removal in a milling or machining operation.

Abstract: Work pieces, especially of rotational symmetry, are machined in a rotary broaching operation. The machine tool for this purpose has a tool carrier carrying a plurality of cutting edges arranged on a curved path in a radial work piece plane. In order to reduce down-time and to simplify the construction of the broaching apparatus, the insertion of a work piece blank into the apparatus and the removal of a finished work piece from the apparatus are preferably performed without interrupting the motions of a tool carrier. For this purpose the tool carrier is provided with a zone which is free of cutting tool edges. This tool free zone of the tool carrier is located downstream of the last cutting edge as viewed in the rotational direction of the tool carrier. This feature avoids the need for a return stroke of the tool carrier. Accordingly, respective return slides and return controls are also obviated.

Abstract: The quality of rail wheels still attached to a rail vehicle or removed from the rail vehicle, is automatically monitored and measured for correction purposes as a rail vehicle or even an entire train passes through a measuring range. The measuring range includes auxiliary rails providing a running or reference plane, at least one diameter sensing device and at least one wheel tread profile quality sensing device. Both sensing devices can perform their function while a wheel or wheels are travelling through the measuring range. Signals provided by the sensing devices are supplied to signal processing and evaluating circuits which may provide a signal record and/or control signals for a wheel truing operation.

Abstract: Conventional methods for reprofiling profiles of wheel sets by lathe machining predominantly produce continuous chips which interfere with the operating process, which can cause damage to the machine and which require continuous attention on the part of the operating personnel. The production of short fragmented chips through the use of suitable cutting edge geometry is impossible because of the continuous change of the cutting data during the reprofiling of such work pieces. In order to eliminate this problem, the profile is faced off or turned through the alternating use of hard-metal cutting materials and heavy-duty cutting materials and by adapting the cutting data to the cutting material then in use, wherein the heavy-duty cutting material is used in those profile regions in which a shock or sudden load on the cutting material is not expected, while the hard-metal cutting materials are used in the remaining regions.

Abstract: A crankshaft rolling machine rotatably guides a crankshaft to be rolled. At least one movable rolling fixture carrying rolling dies is positionally controlled by two synchronously driven rotatable cranks having parallel mounting shafts. Eccentric crank pins are coupled to the fixture. An adjustable connection is interposed between crank pins and mounting shafts of the cranks.

Abstract: A tool for use in a lathe for truing railroad wheels comprises a plurality of cutting tools mounted on a common tool carriage. One of the tools is independently movable relative to the other tool or tools so that the rolling surface and wheel flange of a worn wheel may be trued in a single axial cutting stroke of the tool carriage. The arrangement is such that the movable tool is withdrawn after cutting at least a portion of the worn rolling surface, and another tool cuts the remaining defective stock of the rolling surface as well as the wheel flange.

Abstract: The present method relates to finish boring of prebored bores in a work piece such that an operative fit with a counterpart or further work piece is achieved. The finishing of the bore may be accomplished independently of the instantaneous temperature of the work piece and of the counterpart by operating a tool carriage, for example, on a lathe, with a stepping motor controlled by a correction value computer which generates a control signal in response to a temperature difference between the work piece temperature and a reference temperature. The reference temperature may be that of the further work piece.

Abstract: A tool for use in a lathe for truing railroad wheels comprises a plurality of cutting tools mounted on a common tool carriage. One of the tools is independently movable relative to the other tool or tools so that the rolling surface and wheel flange of a worn wheel may be trued in a single axial cutting stroke of the tool carriage. The arrangement is such that the movable tool is withdrawn after cutting at least a portion of the worn rolling surface, and another tool cuts the remaining defective stock of the rolling surface as well as the wheel flange.

Abstract: A boring tool having a tool head rotatable about its axis and movable in direction of the axis along a working stroke and a return stroke. A knife having a pair of opposite cutting edges is floatingly mounted in a slot of the tool head extending transverse to the axis thereof and tiltable in the slot between a working position and a withdrawal position in which the cutting edges of the knife project a smaller distance beyond the periphery of the tool head than in the working position to prevent damage of the machined surface during the return stroke of the tool head.

Abstract: A railroad-car wheel is rotated continuously about its central axis. A tool having three axially and radially spaced cutting portions is first displaced along the wheel so as to remove high spots at the inner and outer edges thereof by means of the two end cutting portions. Thereafter the tool is backed up and again axially displaced over the rotating wheel so that the cutting portions sequentially take more material off the workpiece constituted by the wheel and impart to it the desired profile in a single second pass.

Abstract: A method for centering the wheels of a two wheel set with the centerline extending between the dead centers of a machining-, measuring-, or testing-apparatus, in which each wheel of the set is lifted by a separate lifting device and in which the position of each wheel during its lifting is sensed by a separate sensing device, coordinated with the respective lifting device, to stop further lifting movement of the respective lifting device when the center of the respective wheel coincides with the centerline of the apparatus, to thus properly align the centers of the wheels of the two wheel sets with the centerline of the apparatus regardless of any difference of the diameters of the two wheels or any asymmetrical loading on the axle of the wheel set; and an apparatus for carrying out the method.