Aluminum is one of the most extensively used metal in aerospace industry and other applications due to its corrosion resistance, good machineability excellent mechanical properties and high strength to weight ratio. Machining parameters like number of inserts, depth of cut, cutting speed, feed rate, and cutting tool diameter have considerable impact on production rate, surface finish, energy consumption and sustainable machining. Suitable process parameters during machining and specifically milling process not only leads towards better surface finish but also towards sustainable machining. Aim of machining has always been to produce parts with better surface quality and lower energy consumption. To study the effect of milling parameters on the surface finish, Taguchi L9 array was employed for experimentation. The outcome of each parameter on surface finish has been examined using ANOVA and the most considerable parameters were identified. It has also been observed that the number of inserts significantly influence the surface finish.