Method for grinding workpieces, in particular for centering grinding of workpieces such as optical lenses

A method of grinding a workpiece, by a grinding tool with use of an actuator for producing a relative advancing movement between said grinding tool and said workpiece, wherein the actuator together with a controller for an actuator current, which determines an advance force of the actuator, is integrated in a position control circuit which is run through with a predetermined control cycle, wherein for each control cycle:

• (i) a target movement direction (Rsoll(n)=−1, 0 or 1) of the advancing movement as well as an actual movement direction (Rist(n)=−1, 0 or 1) of the advancing movement are determined;
• (ii) the determined actual movement direction (Rist(n)) of the advancing movement is then compared with the determined target movement direction (Rsoll(n)) of the advancing movement;
• and
• (iii) if the comparison gives a difference between the actual movement direction (Rist(n)) of the advancing movement and the target movement direction (Rsoll(n)) of the advancing movement a predetermined current limit (Isollmax) for the actuator current (I(n)) delivered by way of the current controller is subject to defined reduction in order to reduce the advance force of the actuator.