The results show that while the most effective parameter on the surface roughness was the feed rate (88.62%), the most effective parameter on the sound intensity level was the cutting speed (44.92%). The relationship between cutting parameters and output variables was analyzed with two-dimensional and three-dimensional graphics. Optimum cutting parameters and levels were determined according to these optimum values. The effects of the cutting parameters on surface roughness, energy consumption, electric current value, and sound intensity level were investigated. A total of 27 experiments were modeled utilizing full factorial design and were carried out using a CNC lathe. The analyses were carried out by applying response surface methodology with the analysis of variance method. In this experimental study, AISI H11 hot work tool steel that has been hardened up to 50 HRC was subjected to hard turning tests with coated carbide tooling. In recent years, hard turning, an alternative to grinding, which provides low cost and good surface quality, has become an attractive method to the manufacturers.
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