for controlling the drive motor s a main criterion of the processing quality of the machine tool 1 is the positioning accuracy of the processing head 4 under dynamic forces when a dynamic force acts on the cantilever arm 3 in a direction perpendicular to the length of the arm 3 the positioning accuracy of the arm in the perpendicular direction can be compromised for example when a force acts on the arm 3 in the x direction due to acceleration of the arm 3 in the x direction ax or due to a change of acceleration in the x direction jx the positioning accuracy of the processing head 4 in the x direction can depend on the y position of the processing head 4 fig1 a 1 b and 1 c show the distance l of the processing head 4 from the guide rail 2 along the cantilever 3 at a minimum intermediate and maximum distance respectively the larger the distance l of the processing head 4 from the guide rail 2 the smaller is the positioning accuracy in the x direction of the processing head 4 under dynamic forces thus the same acceleration of the cantilever arm 3 in the x direction results in a greater positioning error when the processing head 4 is farther away from the guide rail 2 as shown in fig1 c than when.