Abstract: An apparatus for checking the diameter of crankpins (15) of a crankshaft in orbital motion about a geometrical axis in a numerical control machine tool includes a V-shaped reference device (10), a measuring device (6) and a support device (4) fixed to the tool holding slide (2) that movably supports the reference device and the measuring device. A control device (50) for controlling automatic displacements of the apparatus towards and away from a checking condition, includes a programmable electric motor (60) and a transmission mechanism (62). The programmable electric motor is programmed to define a start position in which the automatic displacement of the apparatus away from the checking condition can be stopped, for instance a rest position or an intermediate position between the rest position and the checking condition.

Abstract: An apparatus for grinding a cam having an outer surface with outwardly convex and outwardly concave portions has a frame and a main drive on the frame for holding the cam and rotating it about a main axis. A pair of drive motors having respective output axes generally diametrally flank the main axis. Respective carriages carrying the drive motors are shiftable on the frame radially of the main axis. One of the motors is shiftable into an inner position in which the main axis extends through the one drive motor. Respective grinding wheels are rotatable by the motors about the respective axes, and the wheel of the one motor is of substantially smaller diameter than the wheel of the other motor.

Abstract: A crankshaft is machined by first securing it in first and second radially displaceable grippers of first and second holders rotatable about a common grinding axis and orienting the workpiece axis coaxial with the grinding axis. Then the crankshaft is released from the first gripper, and the second holder is rotated to align the first crankpin radially with the grinding axis. Subsequently the crankshaft is regripped by the first gripper and released by the second gripper and the second holder is rotated relative to the crankshaft until the second holder is aligned with its displacement direction lying in a common plane with the grinding axis and the displacement direction of the first gripper. Finally, both the grippers are shifted parallel to each other in their displacement directions to center the first crankpin on the grinding axis, and the crankshaft is about the grinding axis while machining the first crankpin.

Abstract: A method for machining a workpiece in which a machine tool comprising a first and a second chuck devices is employed to machine the workpiece, the machine tool being used in which the first and the second chuck devices comprise a chuck main body, plural chuck jaws, a chuck jaw drive body, and a pressing member, the method comprising: machining a clamp part of the other end part of the workpiece in a state where one end part of the workpiece is clamped by the first chuck device; machining a clamp part of the one end part of the workpiece in a state where the clamp part of the other end part of the workpiece is clamped by the second chuck device; and executing desired machining on the workpiece in a state where each of the clamp parts are clamped by each of the chuck devices.

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 carrier head for chemical mechanical polishing of a substrate having a front surface, a back surface and an edge. The carrier head has a base, an inner retaining ring positioned beneath the base, and an outer retaining ring surrounding the inner retaining ring to retain the inner retaining ring. The inner retaining ring has a main portion with a first surface to apply a load to a perimeter portion of the back surface of the substrate and an annular lower projection protruding downwardly from the main portion with a second surface to circumferentially surround the edge of the substrate to retain the substrate.

Abstract: The invention relates to a device for the finishing treatment of shaft workpieces, in particular crankshafts and camshafts. The device comprises a carrier, at least one jaw for exerting contact pressure on the workpiece, and a linear guide for guiding the jaw. The linear guide is supported by a transverse guide to form a cross guiding system which follows the rotational motion of the workpiece by revolving around its axis of rotation. The transverse guide contains a main carriage guided on the carrier. The main carriage is radially aligned with respect to the axis of rotation of the workpiece. The main carriage has a fork-shaped head facing towards the side of the workpiece. A guide rail for the linear guide is chucked between the between the legs of the fork-like head.

Abstract: A crankshaft machining apparatus for use in machining a crankshaft from a workpiece, includes: a bed; a pair of work heads mounted on the bed for fixedly supporting the workpiece to be machined at both ends thereof, respectively; at least one cutter head disposed between the work heads so as to be displaceable in an axial direction of the workpiece; and an inside edge cutter mounted on a said cutter head for cutting in the workpiece simultaneously a pair of counter weights of the crankshaft along their respective outer peripheries, the counter weights being located at both ends of a pin journal of the crankshaft, respectively. This arrangement has the ability to form the outer peripheries of a pair of counter weights simultaneously, and provides a markedly enhanced machining efficiency.

Abstract: A method of supporting a workpiece having journal and eccentric regions, in a grinding machine for grinding the eccentric regions thereof, is described which involves mounting the workpiece in a headstock of the grinding machine, providing a coupling between the workpiece and a rotary drive mechanism for rotating the workpiece about its main axis and fitting around at least one remote journal region of the workpiece a pair of members which form a journal bearing complementary to the said region, and fixing the lower of the two members to the machine, thereby providing support for the workpiece at the said remote position. The method is particularly relevant to the grinding of crankpins of a crankshaft.

Abstract: A chuck (25) for chucking a journal (271) of a crankshaft (27) is attached to the distal end of a main spindle (22) rotated by a drive motor. A phasing rotary shaft (53) is connected to the chuck (25) to rotate about an axis offset from the axis of the main spindle (22). The chuck (25) is provided with a coupling (63) that releasably connects the phasing rotary shaft (53) and the chuck (25). Further, a locking mechanism for locking the phasing rotary shaft (53) is provided. The coupling (63) has a pair of coupling plates (64 and 65) that can be moved closer to and farther from each other. Opposing faces of these coupling plates (64 and 65) have teeth (641 and 651), which are meshed when the coupling plates (64 and 65) are brought close to each other.

Abstract: A crankshaft phase indexing apparatus of this invention is provided with a pair of spindles arranged in alignment with a first axis. The Spindles are rotated respectively by a pair of spindle driving motors, which are controlled to rotate at the same speed. Chucks are mounted to the respective spindles. The chucks hold ends of a crankshaft in alignment with a second axis, which is displaced from and parallel to the first axis. A phase conversion shaft is rotatably arranged in at least one of the chucks in alignment with the second axis. The phase conversion shaft is connected to the crankshaft for rotating the crankshaft to permit phase indexing of crankpins of the crankshaft into axial alignment with the first axis. A phase indexing shaft, which is coupled to the phase conversion shaft, is located concentrically with the spindles and is rotated by a phase indexing motor.

Abstract: The invention relates to grinding belts and polishing belts, which are particularly suitable for processing enclosed constructions, since they can be re-sealed by simple means and manner after severing to form a ring-shaped endless belt.

Abstract: A spindle, comprised of a spindle body and an indexing fixture, is configured to retain, and rotatingly drive, a crankshaft relative to a grinding tool, so that each pin on the crankshaft is ground with a high degree of precision. A locking mechanism, such as a pair of jaws with complementarily shaped teeth, is interposed between the spindle body and the indexing fixture. Pressure is applied to one side of the locking mechanism so that the jaws are normally engaged and the spindle body and the indexing fixture rotate as a unit. Motive power for such fixture is supplied by a single servomotor secured to a primary drive shaft, which is joined to a secondary drive shaft, through an offset coupling, to define a motorized spindle.The indexing fixture is bolted, or otherwise secured, to the free end of the secondary drive shaft. A bearing block in the indexing fixture receives and retains, the main shaft of the crankshaft; clamping arms with clamp shoes press the shaft downwardly into the bearing block.

Abstract: An apparatus for grinding particularly a crankshaft is proposed, the apparatus having a workpiece headstock and a tailstock with, in each case, a bearing, which is disposed in the extension of the crankshaft axis and is intended to accommodate the crankshaft at its axial end points. Moreover, the workpiece headstock and the tailstock each have a spike, in which the crankshaft is mounted and fixed free of axial pressure.

Abstract: A work drive orienting system for a machine tool, such as a multiple belt grinder, comprises a head stock and a tail stock for supporting the workpiece to be machined, a locator retained by a spider in the head stock chuck, and a proximity sensor located in the loader operatively associated with the machine tool. The workpiece has journals at opposite ends, and spaced eccentric portions, such as cam lobes; also, a locating pin projects axially from one end of the workpiece. The locating pin has a predetermined angular relationship to the spaced eccentric portions of the workpiece.The locating pin must pass alongside the locator, which has a cylindrical body with a projecting tab, before power is supplied to the head stock and/or tail stock to drive same. A proximity sensor, located in the loader, scans an approximately 70.degree. arc on the workpiece, for the presence of eccentric surfaces, such as cam lobes.