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Table 9.

Mean, S/N and standard deviation of surface roughness using Taguchi method vs. RSM.

Confirmation experiment Power Oxygen pressure Frequency Cutting speed Average surface roughness (µm) Taguchi
Average surface roughness (µm) RSM
Mean S/N Standard deviation Mean S/N Standard deviation
1 150 1.5 75 25 4.761 −13.586 0.50232 4.8900 −13.1231 0.549294
2 250 2.5 125 35 7.127 −17.065 0.34921 7.3025 −16.2945 0.034774
3 350 2.75 175 15 8.63 −18.739 0.70333 8.6031 −17.6728 −0.23048
4 450 0.50 65 12 5.321 −14.541 0.45143 5.3934 −14.0588 0.761597
5 550 0.25 190 18 6.426 −16.199 0.76524 6.7472 −15.2856 1.024166
6 200 1 200 40 5.821 −15.318 0.46253 5.7540 −14.4701 1.069272
7 600 3 50 10 9.865 −19.882 0.10233 9.7486 −21.2714 −0.68546
8 400 2 125 25 8.341 −18.429 0.35183 7.5635 −17.1677 0.257539
9 200 3 200 10 8.152 −18.273 1.04428 8.1701 −15.5729 −0.36771
10 600 1 50 40 7.210 −17.164 0.30524 7.3325 −17.3566 0.751522

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