OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 7 1 5 Fig. 15. 3D model of the surface after the sixth step of the experiment Comparing the 3D model in Fig. 15 to the case in Fig. 13 indicates a significant deterioration in the quality of the machined surface. A graph summarizing the experiments is shown below (Fig. 16). Fig. 16. Results of surface quality measurement at 4 points As can be seen in Fig. 16, the Ra indicator is the most informative parameter. In general, the data obtained from the Contour ELITE optical three-dimensional microscope, particularly the 3D models, are qualitative in nature. They do not provide a clear, quantitative depiction of changes in the roughness of the machined surface. For quantitative surface quality assessment, a T4HD contour profile recorder was used, and its measurement protocols for a representative experimental step are shown in Fig. 17. Note that the roughness parameters were evaluated in the direction orthogonal to the feed, that is, along the y-axis.
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