Natural fiber composites are now a days being used in various engineering applications to increase the strength and to optimize the weight and the cost of the product. In this project banana fiber and coconut sheath fiber are taken for the development of the composite material. The sodium hydroxide treated banana fiber and coconut sheath fiber is used as reinforcing material for Vinyl ester resin matrix. Composites are formed by combining materials together to form an overall structure that is better than the individual components. The two materials work together to give the composite unique properties. Banana plant not only gives the delicious fruit, but it also provides textile fiber, the banana fiber. It grows easily as it sets out young shoots and is most commonly found in hot tropical climates. All varieties of banana plants have fibers in abundance. These fibers are obtained after the fruit is harvested and fall in the group of bast fibers. Machinability properties of fabricated composite is evaluated by using lathe milling machine and also measured surface finish of the machined components.