Abstract
An experimental investigation has been carried out on the chatter vibrations due to cutting force variations caused by the intermittent cutting and the periodic chip formation. In this paper turning experiments are carried out using a small tool-dynamometer of piezoelectric type attached to a cantilever-type structure which is assumed to vibrate only in the direction of the principal mode. The results obtained are as follows. (1) The amplitude of the forced chatter vibration induced by the intermittent cutting is not increased or decreased by the regenerative effect, irrespective of the direction of the principal mode. (2) In machining of the free-cutting brass and the austenitic stainless steel which create periodic chips, selfexcited chatter vibrations are induced in the cutting direction extremely. These vibrations are quite different from the regenerative chatter, and are induced because the period of the chip formation is controlled by the tool vibration.
