Abstract
Summary Conventional tool life criteria such as flank wear width and crater wear depth have certain disadvantages and the maximum machining ratio (the ratio of the volume of material removed to the volume of tool wear) is proposed for the assessment of tool life. It is simple to use and is based on the combined wear of flank and crater, chip notching and primary and secondary grooving. The behaviour of the machining ratio with various cutting parameters was investigated and its suitability as a criterion for tool life assessment examined. The maximum machining ratio was found to be the best criterion for tool life measurement.
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