Abstract
A new method for chatter detection in turning on a lathe is introduced. It exploits a significant change of cutting dynamics caused by the onset of chatter. The changes are reflected in both dynamical and statistical characteristics. Experimentally, the transition from chatter-free cutting to chatter was achieved by a change of either cutting depth or turning frequency. For the characterization of cutting dynamics the coarse-grained entropy rate is applied. A high value of the entropy rate is typical for chatter-free cutting, while for chatter a low value is typical. For the purpose of chatter detection the normalized value of the entropy rate is used and a characteristic threshold is defined. The value of the threshold is independent of cutting conditions. In addition to chatter detection, the entropy rate is applicable for qualitative physical interpretation of cutting process properties.
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