In this study, the author use the experimental design method to determine the relation between cutting parameters and surface roughness in lathe processing. The machine lathe model T620 with ceramic cutting tool is used to cutting C45 carbon steel samples which is widely using for machining process. The requirement for qualified worker is medium. The cutting parameters: cutting velocity (v), feed rate(s) are change while the cutting depth is 0.5mm. The surface roughness of specimens are measured by handle surface roughness machine Mitutoyo SJ-310 model. By using Box -Hunter experimental design method, the equation of regression is determined. Thanks to this equation, the optimum cutting parameters is find out.
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