<![CDATA[Diameter deviation in Aluminium 6061 motorcycle front wheel collar components is a critical quality indicator since deviations exceeding the ±0.02 mm tolerance may cause loose joints and induce wheel vibration during operation. This study aims to determine the optimal CNC turning parameter combination to minimize diameter deviation using the Taguchi method. Three parameters were investigated: spindle speed (1300, 1900, 2500 rpm), feed rate (0.10, 0.20, 0.30 mm/rev), and depth of cut (1.50, 2.00, 2.50 mm), arranged in an L9 orthogonal array with three replications on a Mori Seiki SL-25 CNC Turning machine using CNMG 120402-HA carbide inserts. The Smaller-the-Better quality characteristic was applied in signal-to-noise ratio and analysis of variance (ANOVA). Results revealed that depth of cut was the most dominant factor contributing 60.09%, followed by spindle speed at 28.08% and feed rate at 10.71%, with an error of 1.12%. The optimal condition was obtained at 2500 rpm spindle speed, 0.10 mm/rev feed rate, and 2.00 mm depth of cut, yielding a predicted diameter deviation of 0.031 mm within a 95% confidence interval of 0.020 to 0.049 mm. Confirmation testing produced an average deviation of 0.044 mm, which remained within the predicted interval, thereby validating the model. The Taguchi method proved effective in identifying optimal machining parameters for producing precise and consistent Aluminium 6061 collar dimensions.]]>
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