Abstract
This paper describes the chatter stability of a boring bar the side faces of which are cut off so as to have a directionality in dynamic characteristics. The chatter stability is analyzed by both the theory of a coupled oscillation and the theory of a regenerative chatter vibration, considering the dynamic cutting force. Furthermore the effect of the directionality on the suppression of the chatter, which is estimated by two theoretical analyses, is verified by some experiments. The results obtained are as follows : (1) Chatter stability limits evaluated by the theory of the regenerative chatter vibration are lower than those by the theory of the coupled oscillation in any condition. (2) Experimental results agree well with the stability limits of the regenerative chatter vibration. Therefore it is clarified that the chatter stability of the boring bar depends on the regenerative chatter theory. (3) It becomes clear that the chatter stability is not sufficiently improved by the side cut boring bar.
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