Abstract
The purpose of this study was to determine the effects of various cutting condition on the cutting resistance and surface roughness of material in turning operation using a coated carbide tool. The workpiece materials were the carbon steel SM20C and SM45C The results of this study are summarized as follows: The cutting force decreases as the feedee amount and the cutting depth decrease and the cutting speed increases. In order to obtain a proper surface roughness to each material it is desirable to set the feeding amount as 0.059mm.rev, the cutting depth as 0.4mm and the cutting speed as 270m/min for SM20C, while setting the feeding as 0.059mm/rev the cutting depth as 0.6mm and the cutting speed as 270m/min for SM45C.