A workpiece holding assembly (20) comprises a magnetic chuck (22), and first and second separate sets of workrests for engaging with the outer circumferential surface of an annular workpiece (40, 60). The workrests are configurable such that when the outer circumferential surface of the workpiece (40, 60) is ground with the chuck Urotating in one direction, the outer circumferential surface is only urged in contact with the first set (26, 28) of workrests, and when an inner circumferential surface of said workpiece is ground with the direction of rotation of the chuck reversed, the outer circumferential surface is only urged in contact with the second set (30, 32) of workrests. Grinding methods using such a workpiece holding assembly are also described.

This cylinder device of the present aspect includes: a cylinder having a bottomed tubular shape; a seal member provided at an opening of the cylinder; and a piston rod that is provided to protrude from the opening of the cylinder and slides with respect to the seal member. A sliding surface of the piston rod has a chrome-plated layer. In the sliding surface, as characteristic evaluation parameters of a plateau structure surface described in JIS B 0671-2 and ISO 13565-2, a reduced valley depth Rvk is 0.06 μm or more and less than a plating thickness, a reduced peak height Rpk is 0 μm or more and 0.04 μm or less, and a core roughness depth Rk is 0.08 μm or more and 0.16 μm or less.

The present invention relates to a measuring steady rest which has a device for supporting central workpiece regions, in particular, bearing points on shaft parts, in particular crankshafts, and a measurement device integrated therein for directly adjusting the measurement of the workpiece regions before and/or during machining of the shaft parts. The measuring steady rest is preferably designed in the form of a prism, the measurement device being arranged on the bottom of the prism between the lateral flanks of the prism. The present invention further relates to a grinding machine comprising such a measuring steady rest, and to a method for supporting and measuring central workpiece regions on such a grinding machine comprising such a measuring steady rest.

While the loading member supporting mechanism moves the loading member from the workpiece set state to the workpiece retracted state and returns to the workpiece set state again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position to the replacement position and an operation of disposing the workpiece holding portion disposed at the replacement position to the processing position in a trajectory in which the loading member does not interfere with the shoe.

While the loading member supporting mechanism moves the loading member from the workpiece set state to the workpiece retracted state and returns to the workpiece set state again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position to the replacement position and an operation of disposing the workpiece holding portion disposed at the replacement position to the processing position in a trajectory in which the loading member does not interfere with the shoe.

A centerless roll grinding machine includes a lateral support of a V-channel support that is received by a vertical support of a frame and extending horizontally in the first direction to contact a second side of one neck of a work roll. A lower support received by and extending generally upwardly from the frame displaced in the first lateral direction from a geometric center of the neck of the work roll cooperates with the lateral support to provide the V-channel support to hold the work roll for rotation about a longitudinal axis. A lateral support device includes radially spaced bearing pads on the neck in opposition to a grinding wheel. Each pair of bearing pads is pivotally attached to a respective first tier averaging link that is pivotally coupled to a horizontal ram to reduce displacements of the work roll caused by errors in the neck.

A centerless roll grinding machine includes a lateral support of a V-channel support that is received by a vertical support of a frame and extending horizontally in the first direction to contact a second side of one neck of a work roll. A lower support received by and extending generally upwardly from the frame displaced in the first lateral direction from a geometric center of the neck of the work roll cooperates with the lateral support to provide the V-channel support to hold the work roll for rotation about a longitudinal axis. A lateral support device includes radially spaced bearing pads on the neck in opposition to a grinding wheel. Each pair of bearing pads is pivotally attached to a respective first tier averaging link that is pivotally coupled to a horizontal ram to reduce displacements of the work roll caused by errors in the neck.

A device for producing a curved lateral surface on a rolling element for a rolling bearing includes a grinding apparatus for grinding the curved lateral surface and a retaining apparatus having a control wheel with a convexly profiled peripheral feeding surface for retaining the rolling element during the grinding. The retaining apparatus may include a plurality of control wheels. The control wheel or the convexly profiled peripheral feeding surface may be formed from a ceramic, a resin-bonded synthetic, or a metallic material. The device may include a dressing apparatus for profiling the convexly profiled peripheral feeding surface of the control wheel.

A sharpener cover retrofit attachment to retrofit an electrode sharpener cover attachment on an electrode sharpener, the electrode sharpener for sharpening an electrode rod and having a protruding hollow sharpener shaft with a sharpener shaft outer diameter and a rotating sharpener shaft inner diameter for accepting the electrode rod. The attachment includes a first and second annulus, both axially aligned such that they are able to accept and align the electrode rod into the rotating sharpener shaft inner diameter.

A sharpener cover retrofit attachment to retrofit an electrode sharpener cover attachment on an electrode sharpener, the electrode sharpener for sharpening an electrode rod and having a protruding hollow sharpener shaft with a sharpener shaft outer diameter and a rotating sharpener shaft inner diameter for accepting the electrode rod. The attachment includes a first and second annulus, both axially aligned such that they are able to accept and align the electrode rod into the rotating sharpener shaft inner diameter.