| Drilling Speed Chart | ||||
| WIRE DRILLS | CORE DRILLS AND SIMILAR BY OUTSIDE DIAMETER | |||
| .75 – 2.5 mm | 1/8 to 1/2 inch | 5/8 to 1-1/2 inch | 1-3/4 to 2-3/4 inch | 3 to 4 inch |
| 30,000 TO 18,000 rpm | 2,400 -1,000 rpm | 1,250 – 1,000 rpm | 1,100 – 850 rpm | 850 – 200 rpm |
Drilling Speed Chart
June 12, 2012