| Summary: | This research was to study effect of milling, which was affected on surface finish of Chromium-Molybdenum steel. Fifty-four pieces of JIS SCM 415 steel was used specimen. The experiment was done by CNC vertical milling machine and cutting tool was PVD coated tungsten carbide tool. The factorial design was applied and factors were consisted of three factors: cutting speed and feed rate and depth of cut that were set in three levels. The results revealed that surface finish was affected by two main factors of feed rate and depth of cut. On the other hand, cutting speed was not significantly main factor. However, interaction between cutting speed, feed rate and depth of cut were factors controlling surface finish. Finally, the effects of milling factors on surface finish were analyzed and discussed.
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