|
Material
|
Speed in RPM
|
Drill Size
|
|
Wood
|
3800 - 4000
3100 - 3800
2300 - 3100
2000 - 2300
700 - 2000
|
0 to 1/4 inch drills
1/4 to 1/2 inch drills
1/2 to 3/4 inch drills
3/4 to 1 inch drills
> 1 inch drills
|
Soft Metals
(copper, aluminum, etc.)
|
6000 - 6500
6000 - 6500
5000 - 6000
4500 - 5000
3500 - 4000
3000 - 3500
1500 - 2500
|
1/16 inch drill
1/8 inch drill
3/16 inch drill
1/4 inch drill
5/16 inch drill
3/8 inch drill
> 7/16 inch drill
|
|
Plastics
|
6000 - 6500
5000 - 6000
3500 - 4000
3000 - 3500
2000 - 2500
1500 - 2000
500 - 1000
|
1/16 inch drill
1/8 inch drill
3/16 inch drill
1/4 inch drill
5/16 inch drill
3/8 inch drill
> 7/16 inch drill
|
|
Steel
|
5000 - 6500
3000 - 4000
2000 - 2500
1500 - 2000
1000 - 1500
1000 - 1500
500 - 1000
|
1/16 inch drill
1/8 inch drill
3/16 inch drill
1/4 inch drill
5/16 inch drill
3/8 inch drill
> 7/16 inch drill
|
