The effect of the high speed steel (HSS) and tungsten carbide tool materials on the machining of the hybrid aluminium metal composite as-cast materials, age hardness and mild steel by measurement of surface roughness is reported in this article. The Al20204 + 10% SiC+2.5% Gr and Al20204 + 10% Al2O3 + 2.5% Gr composites are prepared. By casting and then by age hardening these hybrid composites are used. These four materials are used with HSS and Tungsten carbide tools to study the surface roughness. The four composites are compared with mild steel work piece and with as cast Al20204. The cutting speed is increased from 30 to 125 m/min and the feed rate from 0.006 to 0.125 mm/min. Depth of cut during the analysis is increased from 0.5 to 1.25 mm and vegetable oil as a coolant is used for entire investigation. The analysis in this study reveals that, regardless of materials the surface roughness reduced with cutting speed and increased with depth of cut and marginal increase with increase in feed rate. The Tungsten carbide tool, however, demonstrated greater strength than the HSS tool in producing more roughness.