TIME SERIES ANALYSIS IN METAL CUTTING: CHATTER VERSUS CHATTER-FREE CUTTING

Time series of cutting force under two different regimes of turning on a lathe were analysed. With an increase of cutting depth the cutting regime was changed from chatter-free cutting to one with chatter. Using three different surrogate data tests, the dynamics of chatter-free cutting were found to be consistent with a linearly correlated random process, whereas the dynamics of chatter could be explained by a low-dimensional, presumably weakly chaotic process. The differences in the dynamics of the two cutting regimes were exploited successfully for the purpose of chatter detection.