Abstract: In the control process for surface grinding a measuring sensor of a stationary electronic measuring unit with a memory determines the actual heights of a group of workpiece blanks in a precision grinding machine on workpiece mounts on a switchable spindle head relative to a reference point on the appropriate spindle. To avoid thickness errors due to tolerance-dependent variations of the workpiece mounts at least one reference workpiece of an accurately predetermined thickness is placed on the individual workpiece mounts, and is measured in the same way as the workpiece blanks. Height measurements of the reference workpiece are made on the workpiece mounts relative to the reference points and are fed to the memory as setpoint values.

Abstract: A scanning finger for a scanning device of a machine for automatically shening tools has a horizontal slide for receiving a tool to be ground and a vertical slide carrying at least one grinding spindle. The scanning finger has a scanning face, which is substantially horizontal and limited by and undercut to rest on the free face of a tool tooth to be ground, as well as a face which is downwardly offset from the scanning face and is intended for ascertaining the cutting face of the tooth. In order to make it possible to scan the cutting face at a distance from the original cutting edge, the face for ascertaining the cutting face of the tooth is undercut in the direction of movement of the horizontal slide and below the horizontal scanning face, and below the undercut it has a measuring edge to rest on the cutting face.