## 1 Introduction  
Brass is a commonly used material for manufacturing various machine parts. These parts typically undergo a series of operations to become finished products, and the specific steps can vary significantly depending on the manufacturing method used. The choice of method can significantly influence the surface quality of the material. A model predicts surface roughness by analyzing cutting speed, feed, and depth of cut. Research indicates that surface roughness (Ra), depth of cut, and feed parameters are positively influenced by an increase in corner radius ([PERSON] & [PERSON], 2001 [1]). Furthermore, CNC turning and cylindrical grinding processes were performed on AISI 4340 steel subjected to various heat treatments. The results indicated that surface quality deteriorated with specific feeds and depth of cut values. It is important to note that the study was limited to a specific range of feeds and depth of cut values, and further research is needed to explore the effects of a wider range of these parameters. It was also observed that surface roughness continued to increase with an increase in the number of revolutions ([PERSON] & [PERSON], 2005 [2]). Another study aimed to achieve optimal surface roughness while machining AISI 304 austenitic stainless steel on a CNC lathe. This study adopted a comprehensive approach, ensuring that all relevant factors were considered, and concluded that while increasing cutting speed positively influenced surface roughness, raising the feed had a negative effect ([PERSON] et al., 2008 [3]). The effects of feed and cutting speed on surface roughness and cutting forces were examined experimentally while machining AISI 01 cold work tool steel. Experiments were conducted with a constant depth of cut of 1 mm, utilizingfour different feeds (0.05, 0.1, 0.15, and 0.20 mm/rev) and 7 different cutting speeds (120, 160, 200, 240, 280, 320, and 360 m/min). The lowest surface roughness value was observed at 280 m/min cutting speed across all feeds ([PERSON], [PERSON], 2009 [4]). The effects of feed and cutting speed on surface roughness in the machining of AISI 1040 steel were investigated. The experiments were carried out by dry turning at 2 mm cutting depth, different cutting speeds (46, 91, and 128 m/min), and feed values (0.16, 0.22, and 0.28 mm/rev). Uncoated carbide cutting tools were used in the machining. The findings of this research have practical implications, as it was observed that the surface quality deteriorated with the increase in feed and improved with the increase in cutting speed. As a result, it was seen that 2 mm cutting depth, 128 m/min cutting speed, and 0.16 mm/rev feed value were the most suitable values for surface roughness ([PERSON], 2012 [5]). As a result of the analysis of the relationships between the material properties and forming limits of the M85 brass sheet, it was shown that the value of the homogeneity coefficients changed with increasing strain, and the value of the limit strains strictly depended on the values of the inhomogeneity coefficients and grain size ([PERSON], 2016 [6]). In one study, the effects of tool coating and material on the machinability of low-lead brass alloys were investigated in an external surface turning operation. The tools were coated with carbides and polycrystalline diamond (PCD), and the workpiece materials were CuZn38 As, CuZn42, and CuZn21 Si3P. CuZn38 As material showed the worst machinability regarding machining forces, chip formation, and workpiece quality. In tool life tests, PCD showed higher performance than coated carbide tools ([PERSON] et al., 2016 [7]). AISI D2 cold work steel was subjected to three different heat treatments and was machined on vertical CNC to investigate surface roughness and tool wear. The experiments were conducted by machining at different cutting speeds and feeds, with a constant cutting depth (0.5 mm) and dry-cutting conditions. The best and worst surface roughness values were measured ([PERSON] et al., 2012 [8]).