Merchant circle diagram of forces during machining is presented in the above figure. What is the
correct sequence of notation of normal force shear force cutting force and friction?
(a) 1 – 2 – 3 – 4 (b) 2 – 3 – 4 – 1 (c) 3 – 4 – 1 – 2 (d) 4 – 1 – 2 -3