The calculation method of the Arithmetic Mean Deviation (Ra) is presented for rotational turning. The necessary equations for the calculation of Ra are given beginning from the equation of the cut surface theoretical profile, and we determine the theoretical values in the studied range of the technological parameters. Cutting experiments with these data were performed and the roughness values of the machined surfaces were measured. Then we carried out a comparative analysis of the measured and the calculated values of the arithmetic mean deviation.

Author Biographies

István Sztankovics, University of Miskolc, 3515 Miskolc, Hungary

Assistant Professor Institute of Manufacturing Sciences, University of Miskolc, Department of Production Engineering, Miskolc - Egyetemváros, Hungary

Prof. Dr. habil Dr.h.c. Janos Kundrak, University of Miskolc, 3515 Miskolc, Hungary

Prof. Dr. habil Dr.h.c. Janos Kundrak, DSc, University of Miskolc Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary


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Mechanical processing of materials, the theory of cutting materials, mathematical and computer simulation of machining p

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