Line boring uses a rotational boring bar such that the cutting forces rotate and are repetitive. This is quite different from turning, or boring with stationary boring bars, in which the force directions are fixed. Although the subject of chatter analysis of rotating tools has been extensively studied in milling, the cutting forces are typically intermittent, and the methods used are either analytically approximate or via time domain simulation. This paper will use an analytical method for chatter analysis of line boring, which can also be applied to other full-immersion machining processes with a rotating tool. The analytical results show that the stability lobes for boring with a rotating boring bar are quite different than those for boring with a stationary boring bar, and an explanation is given. Furthermore, results and a qualitative explanation are given to show the discrepancy in stability between the exact and approximate solutions, especially at low spindle speeds. The importance of the results is to provide stability lobes for line boring to help select chatter-free cutting conditions.

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