Investigating the Possibility to Reduce the Residual Stress Level in 2.5D Cutting Using Titanium Coated Carbide Ball End Mill

Table 9

Pareto ANOVA analysis for microhardness.

Level of input parameters ()	response data (dB)
	Level 1 ( = 1)	143.8067	146.7550	144.4295	143.8736
Level 2 ( = 2)	144.7626	143.7977	144.5136	144.6574
Level 3 ( = 3)	144.9414	142.9581	144.5676	144.9797
Total of summation	433.5107	433.5107	433.5107	433.5107
Sum of squares of differences ()	2.2332	23.8672	0.0291	1.9415
Total summation of squares of differences = + + +	28.0710
Contribution ratio (%)	8.0	85.0	0.1	6.9
Factor
Cumulative contribution ratio (%)	85.0	93.0	99.9	100.0
Optimum combination of significant factor levels