For machining with cemented carbides and ceramics, a quantitative assessment of tool failure at the flank for establishing “limit criterion” is necessary. The arbitrarily chosen flank wear limit for all cutting speeds is not valid at higher cutting speeds because of the earlier appearance of the “inflection point” which is often taken as criterion of flank-failure. In this paper, proceeding from the basic physical model of flank wear described in Part I of the paper (ASME Paper No. 68—WA/Prod-5), tool-life relations in the form of Taylor’s equations have been theoretically developed, the parameters of which have been compared with, experimental results. Further, the critical points of inflexion where the flank-wear characteristic enters temperature sensitive region resulting in accelerated wear have been uniquely defined. The location of these critical points have also been verified experimentally.

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