METHOD OF CUTTING THIN-WALLED MEMBER

A method which is able to, without using a chattering vibration preventing retainer, cut a thin-walled member without causing chattering vibration. A method of cutting a thin-walled material performs the following: (A) prepares a material 5 having much stock for obtaining a thin-walled material 3, (B) while rotating the material 5 about a center axis C1, cuts the inner round surface 3a of the material 5 by a desired distance within a predetermined range by feeding a cutting tool relative to the material 5 by the desired distance from the one end side to the other end side of the material along the center axis C1, (C) while rotating the material 5 about the center axis C1, cuts the outer round surface 3b of the material 5 by a desired distance within a predetermined range by feeding the cutting tool relative to the material 5 by the desired distance from the one end side to the other end side of the material along the center axis C1, and (D) alternately repeats (B) and (C) to finish the predetermined ranges of the inner round surface 3a and the outer round surface 3b.