Background: Natural fibre is a hairy like raw material which comes from natural sources such as animal, plant and mineral fibres. Kenaf fibre is one of natural fibres which becoming popular as a reinforced for plastic composite material in the industrial application such as aircraft, automotive, sporting goods, and marine engineering. The objectives of this research are to study the effect of milling parameters on the surface roughness in milling kenaf fibre reinforced plastic composite using Taguchi Method. Later the optimization is carried out to determine the optimum condition for the range of milling parameters under investigation in order to minimize the surface roughness (Ra). In this study, Taguchi Method L8 (2 3 ) design is used to conduct a non-sequential experiment. The milling parameters were cutting speed in the range of (V): 500rpm -1000rpm, feed rate (F): 200mm/mim -1200mm/mim, and depth of cut (DOC): 1.00mm -2.00mm. The experimental results were analysed using the Minitab 16 software. It was found that, the optimum parameters for the minimum surface roughness were the cutting speed at 1000 rpm, feed rate at 200mm/min and the depth of cut 1.0 mm. The feed rate and the cutting speed are the main factors that influence the effect of surface roughness in milling kenaf fibre reinforced composite. High cutting speed and low feed rate resulted and low surface roughness for milling kenaf fibre reinforced composite
