Experimental Results on Surface Roughness in Oblique Turning of C45 Carbon Steel

This study presents the results of an experimental investigation into the influence of the inclination angle of a straight cutting edge on surface roughness in external cylindrical oblique turning of C45 carbon steel. The research is based on an original patent-pending lathe tool, having a straight edge positioned tangentially to the workpiece and with an adjustable inclination relative to its axis. Machining tests were conducted using a constant depth of cut and varying inclination angles of the cutting straight edge, feed rates, and spindle speeds. Surface roughness was measured using an electronic profilometer and compared with results obtained using a conventional ISO 1 turning tool under the same processing conditions. The inclined-edge tool consistently produced lower Ra values, particularly at low cutting speeds and medium feed rates. The findings confirm the potential of oblique turning to achieve very good surface finishes, especially in low-speed machining regimes.