Optimasi Parameter Pemesinan CNC Turning untuk Meminimalkan Deviasi Diameter Collar Menggunakan Metode Taguchi

Abstract

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.