Drill Bit Speeds
DRILL BIT SPEEDS
Sizes are in inches and speeds are in RPM's
Twist Drill Speed | Softwood | Hardword | Acrylic | Brass | Aluminium | Steel |
---|---|---|---|---|---|---|
Size (inches) | Speed (RPM) | |||||
1/4 - 3/16" | 3000 | 3000 | 2500 | 3000 | 3000 | 3000 |
1/4 - 3/8" | 3000 | 1500 | 2000 | 1200 | 2500 | 1000 |
7/16 - 5/8" | 1500 | 750 | 1500 | 750 | 1500 | 600 |
11/16 - 1" | 750 | 500 | * | 400 | 1000 | 350 |