Table 5.
Mean and corrected standard deviations (SD) of the measured and calculated values (Bessel’s correction).
| Hole Number | Hole Diameter (μm) SD = 10 |
Hole Depth (μm) SD = 74 |
Linear Electrode Wear (μm) SD = 3 |
Average Drilling Speed (μm/min) SD = 7 |
Relative Electrode Wear (%) SD = 0.3 |
Side Gap (μm) SD = 10 |
MRR (mm3/min) SD = 0.002 |
Edge Ra (μm) | Relative Roundness |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 423 | 1102 | 167 | 110 | 15 | 43 | 0.016 | < 5 | 4.7% |
| 2 | 431 | 1053 | 118 | 105 | 11 | 50 | 0.015 | < 10 | 4.6% |
| 3 | 450 | 1319 | 178 | 132 | 13 | 69 | 0.021 | < 10 | 4.4% |
| 4 | 402 | 1097 | 157 | 110 | 14 | 21 | 0.014 | < 5 | 4.9% |
| 5 | 406 | 1105 | 145 | 111 | 13 | 25 | 0.014 | < 5 | 4.9% |
| 6 | 409 | 1220 | 144 | 122 | 12 | 27 | 0.016 | < 5 | 4.8% |