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TableĀ 4 Orthogonal test factors and their corresponding levels

From: Study on Cutting Force, Cutting Temperature and Machining Residual Stress in Precision Turning of Pure Iron with Different Grain Sizes

No. Feed (mm/r) Speed of cut (m/min) Depth of cut (mm)
1 0.02 80 0.01
2 0.05 120 0.04
3 0.08 160 0.07
4 0.11 200 0.10