Drilling speeds in RPM, adapted for Grizzly 12-speed drill press (G7943 / G7944)
| Drill Bit | Material | ||||||
|---|---|---|---|---|---|---|---|
| Type | Diameter |
Softwood
|
Hardwood
|
Acrylic
|
Brass
|
Aluminum
|
Steel
|
| Twist | 1/16" to 3/16" |
3050
|
3050
|
2180
|
3050
|
3050
|
3050
|
| 1/4" to 3/8" |
3050
|
1510
|
2180
|
1160
|
2180
|
980
|
|
| 7/16" to 5/8" |
1510
|
980
|
1510
|
980
|
1510
|
540
|
|
| 11/16" to 1" |
980
|
540
|
|
380
|
980
|
380
|
|
| Spade | 1/4" to 1/2" |
2180
|
1510
|
|
|
|
|
| 5/8" to 1" |
1650
|
1510
|
|
|
|
|
|
| 1-1/8 to 1-1/2 |
1510
|
1510
|
|
|
|
|
|
| Brad Point | 1/8" |
1650
|
1160
|
1510
|
|
|
|
| 1/4" |
1650
|
980
|
1510
|
|
|
|
|
| 3/8" |
1650
|
980
|
1510
|
|
|
|
|
| 1/2" |
1650
|
980
|
980
|
|
|
|
|
| 5/8" |
1650
|
540
|
980
|
|
|
|
|
| 3/4" |
1510
|
540
|
980
|
|
|
|
|
| 7/8" |
1160
|
260
|
540
|
|
|
|
|
| 1" |
980
|
260
|
260
|
|
|
|
|
| Forstner | 1/4" to 3/8" |
2180
|
540
|
|
|
|
|
| 1/2" to 5/8" |
2180
|
540
|
260
|
|
|
|
|
| 3/4" to 1" |
1510
|
540
|
260
|
|
|
|
|
| 1-1/8" to 1-1/4" |
1510
|
260
|
260
|
|
|
|
|
| 1-3/8 to 2" |
540
|
260
|
|
|
|
|
|
| Circle Cutter | 1-1/2" to 3" |
540
|
260
|
260
|
|
|
|
| 3-1/4" to 8" |
260
|
260
|
260
|
|
|
|
|
| Countersink | 2-flute |
1510
|
1510
|
|
|
|
|
| 5-flute |
980
|
980
|
980
|
260
|
260
|
260
|
|
Many thanks to the Woodworker's Club of Houston
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© 2003 by Christopher M. Albrecht