15
General Drilling Feeds (mm per revolution)
Drill
Diameter
Range (mm)
Feed
Range
Drill
Diameter
Range (mm)
Feed
Range
1 - 3
3 - 5
5 - 8
8 - 12
12 - 16
0.03 to 0.075
0.05 to 0.18
0.10 to 0.28
0.15 to 0.35
0.20 to 0.45
16 - 20
20 - 25
25 - 30
30 - 40
Over 40
When setting to drill material of unknown machinability the slowest
speed and lightest feed should be used and these should be gradually
increased until optimum output per regrind is obtained.
HELIX ANGLE OR SPIRAL
0.25 to 0.53
0.28 to 0.56
0.30 to 0.60
0.35 to 0.68
0.40 to 0.75
20°
30°
40°
SLOWSPIRAL
NORMAL SPIRAL
QUICKSPIRAL
