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Table 3 Experimental results of surface roughness Ra

From: Turning parameters optimization for TC21 Ti-alloy using Taguchi technique

Experimental serial number

Speed of cut V (m/min)

Feed rate f (mm/rev)

Depth of cut a (mm)

Surface roughness Ra (µm) Mean

1

80

0.05

0.2

0.296667

2

80

0.10

0.4

0.160000

3

80

0.15

0.6

0.720000

4

100

0.05

0.4

0.263333

5

100

0.10

0.6

0.433333

6

100

0.15

0.2

0.523333

7

120

0.05

0.6

0.646667

8

120

0.10

0.2

0.416667

9

120

0.15

0.4

0.563333