Diamond Core Bit Speed Guidelines
| Core Bit RPM | |||
| Diameter | Min. | Ideal | Max. |
| 2" | 1,200 | 1,600 | 2,000 |
| 3" | 800 | 1,050 | 1,300 |
| 4" | 600 | 800 | 1,000 |
| 5" | 475 | 640 | 800 |
| 6" | 400 | 560 | 665 |
| 7" | 340 | 450 | 600 |
| 8" | 300 | 400 | 500 |
| 10" | 240 | 320 | 400 |
| 12" | 200 | 265 | 30 |
| 14" | 170 | 225 | 285 |
| 16" | 150 | 200 | 250 |
| 18" | 130 | 175 | 220 |