Optimasi Variasi Rake Angle, Gerak Makan, dan Kedalaman Potong Terhadap Kekasaran Permukaan pada Proses Bubut Material Getas Batu Granit

Abstract

This study aims to determine the effect of variations in turning parameters on the surface roughness value of Granite with Taguchi Method including rake angle -20°, 0°, 20°, feed rate 0.047 mm/rev, 0.088 mm/rev, 0.214 mm/rev, and depth of cut 0.5 mm, 0.75 mm, 1 mm, and aims to determine the results of turning on visual micro photos. The rake angle variable has an F count of 23.35 which is greater than the F table so H₀ is rejected. The variable that has a significant effect is 0°. Variable feeding motion which has F count of 22.90 which is greater than F table, H₀ is rejected. The significantly influential variable is 0.047 mm/rev. The depth of cut variable has an F count of 21.57 which is greater than the F table, so H₀ is rejected. The significantly influential variable is 0.5 mm. The most optimal process variable is the rake angle which has a contribution of 33.92%, namely at a variation of the rake angle level of 0° with a surface roughness value of 3.648 µm, the feed motion variable has a contribution of 33.28%, namely at a variation of the feed motion level of 0.047 mm / rev with a surface roughness value of 3.908 µm, and the variable that has the smallest contribution is the depth of cut variable which has a contribution of 31.35% at a variation of the depth of cut level of 0.5 mm with a surface roughness value of 3.743 µm.