A.Madhan kumar, S.Arun, Ajay Karthick, D.L. Ashwin Kumar and R.Dinesh Kumar 2018. Experimental investigation of optimized machining time (drilling time) and surface roughness of drilled holes of particle board (PB) and medium density fibre board (MDF) with various cutting environments . International journal of intellectual advancements and research in engineering computations. 6, 1 (Mar. 2018), 616–619.