This research was conducted to optimize the turning process on several quality characteristics with the Taguchi-GRA method. Some of the quality characteristics that are optimized are roundness, material removal rate (MRR) and surface roughness. These three quality characteristics are then converted to a GRG value. The independent variables used in this study are the depth of cut (0.5; 0.75; 1 mm), feed rate (0.045; 0.065; 0.085 mm/rev) and cutting speed (37.68; 56.52; 75.36 m/min). The experimental design used is the L9 orthogonal array. The experimental results show that the turning process can be effectively improved through the Taguchi-GRA method. The optimal combination for obtaining maximum GRG values can be reached at a depth of cut of 1 mm, feed rate of 0.085 mm / rev and cutting speed of 75.36 m / min. The GRG value increased to 34% from 0.7017 to 0.9403.
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