A grinding apparatus grinds a workpiece by rotating the workpiece held by main spindles and a grinding wheel held by a wheel spindle, and by relatively moving the grinding wheel toward and away from the workpiece. The grinding apparatus includes a first detection unit that detects a rotational phase of the workpiece; a second detection unit that detects a grinding resistance moment at a grinding point between the grinding wheel and the workpiece, or detects a drive current of a rotary drive unit of the workpiece or a rotary drive unit of the grinding wheel; a storage unit that stores the grinding resistance moment or the drive current in a manner associated with the rotational phase; and a determination unit that determines a slip between the workpiece and the main spindles based on the grinding resistance moment or the drive current at a current rotational phase, and on the grinding resistance moment or the drive current at the same phase as the current rotational phase of a previous time.

A grinding machine for external cylindrical grinding of hollow shafts may include at least one grinding disc, at least one support disc, and at least two centrings for a face-side fixing of a hollow shaft. At least one of the at least two centrings may be configured as a point. A ruler may be arranged to adjust and hold a position of the hollow shaft during a grinding operation. A rotation axis of the at least one grinding disc and of the at least one support disc may be arranged parallel to one another and define a plane. A rotation axis of the hollow shaft to be ground may extend outside of the plane by a distance of a>12 mm.

A center shaft machining apparatus includes: a grinding structure that moves on a machining central axis while rotating about the machining central axis and machines an end surface on one end side of a workpiece arranged on the machining central axis; an end portion support structure that supports an opposite end side of the workpiece; and a shaft portion support structure that supports a shaft support portion set at an intermediate portion of the workpiece. The end portion support structure includes an eccentric mechanism capable of supporting an opposite end of the workpiece in a state where a workpiece central axis of the workpiece is eccentric with respect to the machining central axis.

A center shaft machining apparatus includes: a grinding structure that moves on a machining central axis while rotating about the machining central axis and machines an end surface on one end side of a workpiece arranged on the machining central axis; an end portion support structure that supports an opposite end side of the workpiece; and a shaft portion support structure that supports a shaft support portion set at an intermediate portion of the workpiece. The end portion support structure includes an eccentric mechanism capable of supporting an opposite end of the workpiece in a state where a workpiece central axis of the workpiece is eccentric with respect to the machining central axis.

Receiving arrangements for receiving camshafts and methods for grinding machining camshafts may be used with camshafts that have a shaft body that extends along an axis of rotation and includes functional elements. A gearwheel may be mounted on the shaft body, wherein a receiving body is provided, by means of which the camshaft can be at least partially received for purposes of performing a grinding machining process. The gearwheel may include a receiving means onto which the receiving body can be engaged and by way of which it is made possible for the camshaft to be received by the receiving body.

Receiving arrangements for receiving camshafts and methods for grinding machining camshafts may be used with camshafts that have a shaft body that extends along an axis of rotation and includes functional elements. A gearwheel may be mounted on the shaft body, wherein a receiving body is provided, by means of which the camshaft can be at least partially received for purposes of performing a grinding machining process. The gearwheel may include a receiving means onto which the receiving body can be engaged and by way of which it is made possible for the camshaft to be received by the receiving body.

A finishing apparatus includes a workpiece-receiving device, a rotary drive configured to drive a workpiece in rotation about a workpiece axis and an oscillatory drive configured to produce a relative movement between the workpiece and a finishing tool in a direction that is parallel to the workpiece axis. A workpiece-conveying device has a workpiece holder that is moveable by a drive device between a working position in which the workpiece is in position to be machined and a loading/unloading position in which the workpiece is loadable/unloadable. The workpiece holder has a support device configured to support the workpiece. The drive device is formed as a swivel drive such that the workpiece holder is swivelable between the working position and the loading/unloading position along an arcuate swivel path.

A finishing apparatus includes a workpiece-receiving device, a rotary drive configured to drive a workpiece in rotation about a workpiece axis and an oscillatory drive configured to produce a relative movement between the workpiece and a finishing tool in a direction that is parallel to the workpiece axis. A workpiece-conveying device has a workpiece holder that is moveable by a drive device between a working position in which the workpiece is in position to be machined and a loading/unloading position in which the workpiece is loadable/unloadable. The workpiece holder has a support device configured to support the workpiece. The drive device is formed as a swivel drive such that the workpiece holder is swivelable between the working position and the loading/unloading position along an arcuate swivel path.

A method concerns producing a cam profile of a cam pack with at least two cam elements that can be adjusted relative to each other. The camshaft may comprise an outer shaft, a rotatable inner shaft, a fixed cam element connected to the outer shaft, and an adjustment cam element connected to the inner shaft. The method may comprise processing an adjustment cam contour by a continuous diameter reduction of a segment of the adjustment cam base circle, wherein the adjustment cam base circle is reduced to a diameter that is smaller than a fixed cam nominal circle diameter minus a doubled adjustment cam base circle tolerance. The method may comprise processing a fixed cam contour by reducing a fixed cam contour protrusion in a region between a transition point and a processing point. Upon reaching the transition point a tapping element for converting a revolving motion of the cam elements into a linear motion of the valves is transferred from the fixed cam element to the adjustment cam element.

A device for the fine machining of a circumferential workpiece surface arranged eccentrically relative to an axis of a workpiece. The device comprises a pressure mechanism configured to press a fine-machining tool against the circumferential workpiece surface. The device also includes a drive unit configured to drive an active section of the pressure mechanism via a first drive and a second drive. The first drive drives the active section in a movement plane that runs crosswise to the workpiece axis along a first movement trajectory. The second drive drives the active section along a second movement trajectory that is at an angle to the first movement trajectory.