Experimental Investigation of Perpendicularity and Surface Finish of Aluminium T6 6082 Machined on VMC 430

Aluminium T6 6082 has a good strength-to-weight ratio, lightweight and capable of withstanding enormous load, so it is widely used in automotive, aerospace, and marine industries. The surface roughness and perpendicularity, a Geometric Dimensioning & Tolerancing control (GD&T), play a major role in reducing the rate of rejection between matting parts during their assembly. The machining parameters like spindle speed, feed, and depth of cut have great influence on surface roughness and perpendicularity. It is necessary to investigate the effect of these parameters for Aluminium T6 6082 material. In this study 23 full factorial design with four centre points is utilised to optimise these parameters for face milling and end milling machining process performed on vertical machining centre. The analysis of variance (ANOVA) is used to determine the dominant input parameters (spindle speed, feed, and depth of cut) having significant influence on the output parameters (perpendicularity and surface roughness). It was observed that the depth of cuts is most influential factor, followed by feed and spindle speed for surface roughness and for perpendicularity the feed is most influential factor, followed by depth of cut and spindle speed.