PENGARUH VARIASI KEDALAMAN PEMOTONGAN DAN KECEPATAN PEMOTONGAN TERHADAP KEKASARAN PERMUKAAN ALUMINIUM 7075

Abstract

This research intends to determine the effect of variations in cutting depth and cutting speed on the surface roughness value of aluminum 7075. Based on the results of data analysis, it can be concluded that cutting speed has an effect on the surface roughness value of the specimen. The higher the cutting speed used, the lower the quality results (smooth). The high cutting depth causes a decrease in the cutting force and the shear cross-sectional area, each cutting depth used has a difference in the surface roughness of the specimen. The greater the depth of cutting used will cause an increase in surface roughness, when the combination of cutting speed and depth of cut is found to have the lowest roughness (fine) at a cutting speed of 14.7 m/min and 0.5 mm, while the highest roughness (coarse) at a cutting speed of 11.3 m/min and a cutting depth ratio of 1. mm. The higher the cutting speed, the lower (fine) the level of roughness and the greater the depth of cutting, the higher the roughness value obtained (coarse).