Open Access

Table 1

Factor levels of process parameters.

Parameters Lower axial point (−α) Lower cubic point (−1) Centre point (0) Upper centre point (+1) Upper axial point (α)
Rotational speed 900 1150 1500 1850 2100
Transverse speed 30 45 60 75 90
Tool tilt angle 1.0 1.5 2.0 2.5 3.0

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