In gene­ral, in the air­craft indus­try even the smal­lest devia­ti­on in the pre­cis­i­on of com­po­nent machi­ning is unwan­ted. This demand is made on num­e­rous com­pon­ents of mili­ta­ry and civil air­craft and machi­ning accu­ra­cy is the most important cri­ter­ion for machi­ne manufacturers.