A method for determining wear or dullness of a cutting tool used to machine a surface of a workpiece. Cutting tool dullness is determined as a function of a plurality of work-hardening values of the machined surface. Each work-hardening value is computed as a function of different and separately measured parameters. The workpiece is characterized as being excessively worn if all of the separately computed work-hardening values are greater than a threshold value.

 
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