It mainly includes the following five methods: one is the double turn head method,

Duas coordinatae rotationis directe directo direction axis instrumenti control; Methodus secundus rotans caput est, ubi duo axes coordinatae sunt in summo cuttorum, sed axis rotation is non est perpendicular ad axim lineam. Tertius est modo dual is rotationis, ubi duo coordinatae rotationis directe rotationem spatialem control; quarta mensa opera est, cum duobus axis in mensa opera, sed axis rotation is non est perpendicula ad illam assem. quintus est swing starting from a rotation, with two rotation coordinates on one tool and one on the workpiece.