© 2022 Gazi Universitesi Muhendislik-Mimarlik. All rights reserved.In this experimental study on machinability, the effects of cutting depth and cutting tools of different profiles on the roughness of the machined surface were investigated in the turning of Al 6061 aluminum alloy. In the experiments, a constant feed rate of 0.2 mm/rev, two different cutting speeds of 125 m/min, 250 m/min and cutting depths of 0.4-0.8-1.6-2.4 mm were selected. The lowest roughness values were obtained as 0.5 μm at 250 m/min cutting speed with the SNMA coded cutting tool. As the depth of cut values decreased, the roughness of the surfaces decreased in general. However, the reverse behavior was observed in machining with SNMA tool and the highest roughness value was obtained at 0.4 mm depth of cut. When all cutting tools and cutting parameters are evaluated together, the highest roughness value was measured as 7.22 μm at 2.4 mm cutting depth with the tool coded TNMG. With the change of cutting speed, different surface roughness values were obtained according to the cutting tool type. However, the expected decrease in roughness values did not occur with increasing cutting speed. DCGT coded tool could not outperform other cutting tools in terms of surface roughness. As a result of this study, it has been determined that the machining performance of the SNMA series coated and negative rake tools is higher.