Correction method for chip removal machines

A chip removal machine comprising:

• a mechanical drive for a tool or a workpiece or a combination thereof, regulated by a control system, wherein the regulation comprises a plurality of values C, X, Z of at least three spatial axes c, x, z for the control system and for the drive, wherein the values C, X, Z have a functional relation fbi with the axes c, x, z, wherein a method is used to determine the deviation of the regulating variables by a) preparing a protocol from a plurality of control system actual values Cp,s, Xp,s, Zp,s detected by measuring means or selected drive actual values Cp,a, Xp,a, Zp,a or a combination thereof,
• b) calculating a control system nominal value according to Zbi,s=fbi (Cp,s, Xp,s) or a drive nominal value according to Zbi,a=fbi (Cp,a, Xp,a) or a combination thereof at least in relation to the z-axis,
• c) calculating a control system differential value according to Dz,s=Zp,s−Zbi,s or a drive differential value Dz,a=Zp,a−Zbi,a or combinations thereof at least in relation to the z-axis, and
• d) determining for at least for the drive and the z-axis a contouring differential value Dz,aφ=Zp,a−Zbi,aφ with Zbi,a φ=fbi (Cp,a +Δφ, Xp,a) where the value Δφ corresponds to a phase shift of the c-axis, which results in a torsion of generated lens contour.