Tool Condition Monitoring Systems

The results of a survey on tool condition monitoring are reported. Both tool wear and tool failure are considered and the differences between DIRECT and INDIRECT methods highlighted. Direct methods usually involve some actual measurements of the wear or failure and are, therefore, mainly classified as ‘off-line’ methods. Indirect methods are normally associated with some fundamental aspect of the machining process and, while being somewhat more complex, can be considered as ‘on-line’ techniques. The indirect online methods can be subdivided into those associated with static phenomena e.g. steady state forces and temperature, and those associated with dynamic aspects, such as vibrations and acoustic emission.

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