Fig. 1: Ajax-EV 310 CNC machine used for the experiment Fig. 2 (a): Schematic drawing for Insert Table 1: Chemical Composition of AISI 1050 Fig. 3: Experimental setup of tool and work piece The average temperature at the cutting zone was measured using a digital thermometer with k-type thermocouple wire which was placed at a distance of 5mm from the cutting edge of the tool. The setup of the digital thermometer probe is shown in A cooling system as shown in Figure 4 was developed to reduce the temperature of the coolant in the sump of the CNC lathe machine to between 7.9°C. This was done to improve the surface roughness of the work piece. The cooling system evaporator was seated in the sump located at the base of the CNC machine. A schematic of the cooling system set-up is shown in Figure 5. Figure 3. The temperature varied through the tool, chip and work piece. Maximum temperature was developed at the tool rake some distance away from the cutting edge and not at the cutting edge. Fig. 4: The Developed Cooling System 1000kg/m? was used as coolant in the sump of the machine. Aeroil N5, a soluble oil with heat capacity of 4200J/kgK and density of Fig. 5: Schematic for cooling system set-up Table 6: S/N ratio response table for SR and MRR (Wet at 29.5°C) Similarly, from Tables 5, 6 and 7, depth of cut is the most influencing factor affecting MRR followed by feed rate. Cutting speed had a lower effect on the MRR compared with the other factors. The optimum control factor combination for maximum MRR is S. FF. and Tn ie 1570m/min, 7O0mm/rev and 0.3mm). S, F and D represent Speed, Feed rate and Depth of Cut while 1, 2 and 3 represents the various levels. The MRR for various experimental runs is shown in Figure 6. Fig. 6: MRR during Experimental runs Fig. 7: Surface Roughness during various machining conditions Fig. 8: Maximum Temperature attained during Experimental runs.
