Patent ID: 7502663

Claim:
A method for determining a deviation of at least one regulating variable on a chip removal machine with 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, and the values C, X, Z have a functional relation f bi with the axes c, x, z, comprising the steps of: a) preparing a protocol from a plurality of control system actual values C.sub.p,s, X.sub.p,s, Z.sub.p,s detected by measuring means or selected drive actual values C.sub.p,a, X.sub.p,a, Z.sub.p,a or combinations thereof, b) calculating a control system nominal value Z bi,s =f bi (C p,s , X p,s ) or a drive nominal value Z bi,a =f bi (C p,a , X p,a ) or a combination thereof at least in relation to the z-axis, c) calculating a control system differential value D z,s =Z p,s −Z bi,s or a drive differential value D z,a =Z p,a −Z bi,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 D z,a φ =Z p,a −Z bi,a φ with Z bi,a φ =f bi (C p,a +Δφ, X p,a ), where the value Δφ corresponds to a phase shift of the c-axis, which results in a torsion of generated lens contour.