Table 2 Input process parameters and their levels.
Expt. No. | Coded values | ||
|---|---|---|---|
Rotational speed (rpm) | Feed rate (mm/rev) | Workpiece thickness to tool diameter ratio | |
1 | -1 | -1 | -1 |
2 | -1 | -1 | 0 |
3 | -1 | -1 | 1 |
4 | -1 | 0 | -1 |
5 | -1 | 0 | 0 |
6 | -1 | 0 | 1 |
7 | -1 | 1 | -1 |
8 | -1 | 1 | 0 |
9 | -1 | 1 | 1 |
10 | 0 | -1 | -1 |
11 | 0 | -1 | 0 |
12 | 0 | -1 | 1 |
13 | 0 | 0 | -1 |
14 | 0 | 0 | 0 |
15 | 0 | 0 | 1 |
16 | 0 | 1 | -1 |
17 | 0 | 1 | 0 |
18 | 0 | 1 | 1 |
19 | 1 | -1 | -1 |
20 | 1 | -1 | 0 |
21 | 1 | -1 | 1 |
22 | 1 | 0 | -1 |
23 | 1 | 0 | 0 |
24 | 1 | 0 | 1 |
25 | 1 | 1 | -1 |
26 | 1 | 1 | 0 |
27 | 1 | 1 | 1 |
