Abstract: Deviations from desired shape of plasticly deformable objects are corrected within narrow tolerances by a method wherein the real shape of the object is sensed, whereupon the deviation from the desired shape is determined and a correction length corresponding to the deviation is defined, after which the object in a straightening operation is subjected to a shape correction corresponding to the correction length. At least one measurement transmitter (4) is disposed to sense the real shape of the object (2) and deliver a corresponding output signal which is fed to a unit (6,8,9) for comparison with information about the desired shape of the object stored in the unit for determining the deviation, the unit delivering an output signal defining a correction length corresponding to the deviation, the output signal controlling a straightening device (12,14,16,18,20,22,24) to carry out a correction of the shape of the object corresponding to the correction length.