Modern Computer Numerically Controlled (CNC) machine tool is a potential application of condition monitoring which is a research area of increasing importance. This paper proposes a multisensorbased condition monitoring scheme for CNC machine tools. It concentrates on some critical aspects in the design of a practical monitoring system, such as the choice of parameters, feature extraction and decisionmaking. The concrete methods and algorithms are presented in detail. The multisensor-based monitoring technique has been implemented in an existing condition monitoring system for a CNC machining center, and has achieved good results.
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