Abstract: To avoid manual rotation of the rotary table (3) on the turning slide (2) of an NC (numerical control) coordinate grinding machine having a grinding wheel (1), when a conical region is being ground on a workpiece next to a cylindrical region, an NC controllable rotating devices (14) for the rotary table (3) is mounted on the turning slide (2). A measurement device (18) is also provided, for determining the distance (R) from a reference surface of the conical region and the B axis. After grinding a calibration cylinder, the distance (S) between the grinding line (6) and the C axis is calculated, and the C axis in this rotational position around the B axis is reset ("zeroed") in the computer (9'). This provides sufficient parameters for calculating the grinding program for the workpiece which is to be ground. In this way it is possible to grind automatically and precisely a series of workpieces having simultaneously both cylindrical and conical regions, without the need for manual adjustments.

Abstract: In order to eliminate the need, during operation, to continually redefine the grinding line (SL 2) between the trimming wheel (12) and the gripping wheel (10), and the need to re-zero the C-axis after each trimming step by the grinding wheel (12) on the grinding wheel (10) in a grinding machine, a trimming wheel (12) with a separate drive (11) is mounted directly on the turning slide (1) instead of on the rotary table (2) of the grinding machine. The said grinding line (SL 2) is thus not displaced when the C-axis is zeroed, but rather is held in a defined position with respect to the longitudinal axis (Z-axis) and to the B-axis perpendicular thereto of the grinding machine. To enable the quality and precision of the trimming to be increased, a trimming wheel (12) is employed which can be mounted on a conical receiving piece which is in turn mounted on a shaft having two bearings.

Abstract: To avoid manual rotation of the rotary table (3) on the turning slide (2) of an NC (numerical control) coordinate grinding machine having a grinding wheel (1), when a conical region is being ground on a workpiece next to a cylindrical region, an NC controllable rotating devices (14) for the rotary table (3) is mounted on the turning slide (2). A measurement device (18) is also provided, for determining the distance (R) from a reference surface of the conical region and the B axis. After grinding a calibration cylinder, the distance (S) between the grinding line (6) and the C axis is calculated, and the C axis in this rotational position around the B axis is reset ("zeroed") in the computer (9'). This provides sufficient parameters for calculating the grinding program for the workpiece which is to be ground. In this way it is possible to grind automatically and precisely a series of workpieces having simultaneously both cylindrical and conical regions, without the need for manual adjustments.