OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 7 No. 1 2025 Fig. 13. 3D model of the surface after the first step of the experiment To illustrate the appearance of a surfacemachinedwith near-catastrophic tool wear, consider a photograph of the machined surface obtained using the Contour ELITE microscope at the fourth experimental point (Fig. 14). Fig. 14. Photograph of the machined surface, obtained with a microscope Contour ELITE, after the sixth step of the experiment As shown in Fig. 14, the quality of the machined surface significantly deteriorated at this step of the experiment. This is also evident from the Ra indicator along the y-axis, which reaches its maximum value in this case (see Table 2). While the arithmetic mean deviation of the profile from the midline along the y-axis is not the highest, this is explained by the specific location of the measurement axis, which did not align with the area exhibiting the greatest profile deviations. The latter case is further illustrated with a 3D model of the surface image (Fig. 15).
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