| Factors | Levels | ||
| 1 | 2 | 3 | |
| Gap (mm) | 0 | 0.1 | - |
| Thickness (mm) | 1 | 2 | 3 |
| Power (kW) | 2 | 2.5 | 3 |
| Speed (m/min) | 3 | 6 | 9 |
| Diameter (µm) | 340 | 450 | 520 |