| Feeding speed (m/min) | Drilling torque (N・m) | Feeding resistance (KN) | ||||
| Maximum value (N・m) | average value (N・m) | standard deviation | Maximum value (KN) | average value (KN) | standard deviation | |
| 0.24 | 570.2 | 525.5 | 15.7 | 3.61 | 3.52 | 0.08 |
| 0.37 | 580.1 | 530.7 | 19.8 | 3.63 | 3.51 | 0.10 |
| 0.63 | 541.3 | 520.4 | 20.7 | 4.21 | 3.65 | 0.28 |
| 0.76 | 544.2 | 518.9 | 23.9 | 5.82 | 3.63 | 0.31 |