Analysis of the Effect of Round, Feeding and Coolant on Surface Roughness in the Processing of Combination Using Factorial Design

Experimental studies to see the surface roughness of the turning process have been carried out. The study was conducted to determine the effect of the main variables and the relationship of variables to surface roughness (modeling). The variables carried out were feeding (f), spindle rotation (n) and coolant. Material Specimens use St-37 with cylindrical dimensions. Test specimens were made using conventional lathes, HSS cutting tools and roughness tests were performed with using a Surfcorder (Surface Roughness Measuring Instrument) SE 1700 . The research method uses factorial design, variable analysis using Yates's algorithm and modeling using Least Square statistics. The test results show that the most influential variable is feeding, f = 4,957 m, where the biggest roughness occurs at conditions f = 1.2912 m / min, n = 640 rpm and without cooling media. The modeling results show that surface roughness is a function of feeding and velocity, Ra = f (f, n), (Ra = 5.2024 f + 0.0048n), the higher the feeding and speed, the greater the surface roughness.