In recent years, the researcher working in material science targeted composites due to the ability to tailor properties according to end application. The polymer nanocomposites are novel engineering polymer composites material with nano-scale reinforcement. The Nano carbon reinforced epoxy nanocomposites are widely used for the development of the product for medical and engineering applications. The machining characteristic is quite different from the machining of conventional material. During the machining of polymer composites, various types of defects associated with the machined component. The adequate and depth knowledge and understanding of the machining behavior is indeed necessary to identify the most favorable machining environments. In this paper, a drilling experiment was performed, and an investigation has been made under machining constrain for surface roughness and circularity error. The surface roughness and circularity error play a significant role in deciding the machined components' quality and performance. The ANOVA analysis has been performed to evaluate the drilling parameter’s significance on surface roughness and circularity error. For the drilling experiment, three different kinds of Tool Materials, i.e., HSS, Carbide, and TiAlN is used and experimentally examine their performance on the surface roughness and circularity error. The machining behavior of polymer composites largely depends on the nature of support, the amount of reinforcement within the matrix, and matrix material behavior.