Abstract Fuzzy-logic principles have been applied for selecting cutting conditions in machining operations. The materials data used for theoretical calculations were for medium-carbon leaded steel (BHN 125-425) and free-machining carbon wrought steel (BHN 225-425). Three different depths of cut (1, 4 and 8 mm) and four types of tools were used for these theoretical studies: (i) high-speed steel tool; (ii) carbide tool–coated; (iii) carbide tool–uncoated brazed; (iv) carbide tool–uncoated indexable. A fuzzy model has been developed for carrying out these calculations. In this model, the fuzzy-metric arcs are overlapped at 50%. All of the calculations for both materials were done manually and equations expressing cutting speed as a function of hardness were obtained for different cases. The technique is demonstrated to be an effective way to present a large volume of experimental data in a compressed form.
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