Constriction-resistance concept applied to wear measurement of metal-cutting tools

The paper describes a mathematical model for the tool-workpiece-interface resistance in a single-point oblique-cutting operation on a lathe. The model is developed using the concept of constriction resistance, and is verified by practical measurements of the interface resistance. The measurement technique is important, and details are given of the significant factors. It is shown that the resistance measurements may be used to calculate the amount of wear on the cutting tool as cutting proceeds. Results show that this method gives the mean value of the flank wear-land width to within ±0.002 in (±0.05 mm) of independent optical measurements for a range of cutting conditions typical of finish-turning operations.