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The use of coolants while machining was reduced because of the problems encountered by it like environmental pollution, health hazards and high setup costs. The present work, deals with the comparison of experimental, geometrical and regression values of surface roughness during CNC turning of AA7075 steel with tungsten carbide tool. The experiments were done on CNC lathe as per Taguchi's standard L9 (3^3) orthogonal array. Cutting speed, feed and depth of cut were taken as inputs at threefatcat:apyb545t7zhpbhxb2f5ybfecwm