Rotation speed (r/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 | |
90 | 552.8 | 525.6 | 12.4 | 6.95 | 5.77 | 0.56 |
140 | 469.4 | 420.6 | 14.7 | 6.14 | 5.35 | 0.45 |
190 | 373.7 | 344.3 | 15.3 | 4.82 | 4.12 | 0.41 |
240 290 | 337.3 221.8 | 309.5 178.4 | 15.7 16.8 | 4.22 2.86 | 3.66 2.86 | 0.23 0.53 |