Trial

Surface roughness (µm)

Signal-to-noise ratio for surface roughness (dB)

1

5.21

−14.3368

2

5.11

−14.16842

3

5.18

−14.2866

4

5.94

−15.4757

5

5.52

−14.8388

6

5.75

−15.1934

7

6.98

−16.8771

8

6.11

−15.7208

9

6.20

−15.8478

10

5.37

−14.5995

11

5.05

−14.0658

12

5.11

−14.1684

13

5.57

−14.9171

14

5.46

−14.7439

15

5.85

−15.3431

16

6.14

−15.7634

17

5.77

−15.2235

18

6.01

−15.5775

19

6.55

−16.3248

20

5.17

−14.2698

21

6.19

−15.8338

22

5.59

−14.9482

23

5.10

−14.1514

24

5.54

−14.8702

25

6.26

−15.9315

26

6.11

−15.7208

27

6.89

−16.7644