The kinematics of gear machining processes with form cutting tools is simple. Only one motion is required for profiling gear tooth flanks. This generating motion could be either a straight motion or a rotation. A combination of a translational motion with a rotational motion can also be implemented. In such a case, the translation and the rotation are timed with each other so as to comprise the screw motion. A screw motion, as well as particular types of the screw motion (that is, either a translation and/or a rotation), represents a single parametric relative motion. Only single parametric motions are used for profiling form tools for machining gears.