5 Results and Discussion The comparison of predicted force values with experimental results are depicted in figures 8-10. From figure 9 and 10, it can be revealed that the trends of cutting forces generation by the proposed model are very much similar with experimental results. The cutting force values predicted for TiAlN coated tools are more closer to the experimental forces than those of the un coated tools. Futher, the effects of tool run out and elastic recovery rate are observed significantly at lower feed rate as shown in figure 9. This is due to more ploughing and rubbing at lower feed rate where the effects of minimum chip thickness and the workpiece material spring back after passing of the tool are more. The RMS values of cutting forces obtained by both model and experimentation are shown in figure 10. The figure shows a good correlation between the predicted force values obtained for TiAlN coated tool with experimental results as compared to those of un coated tool. The maximum error obtained by TiAlN coated tool with experiment is only 15.6% and 10.32% in x and y directions, respectively. Whereas the maximum error in x-direction is 34.2% and in y-direction is 32.1% in case of un coated tool.
