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Speeds For Drilling

The speeds shown are for average conditions where coolant can be efficiently applied.  Where the strength of the drill is not a critical factor and where the workpiece can be rigidly supported.  When one or more of these conditions vary, the speeds must be adjusted accordingly.
 
 
Material Being Drilled
Cutting
Speed (SFM)
 
Point Style
Point Angle
Degree
 
Feed Rate
Aluminum Alloys

200-300

Conventional

118

Med-Hvy.

Magnesium Alloys

200-300

Conventional

118

Med-Hvy.

Brass & Bronze

75-150

Conventional

118

Med-Hvy.

Cast Iron
Soft
Medium Hard
Hard Chilled
Malleable
 
75-125
50-100
10-20
75-125
 
Conv. or Split
Conv. or Split
Conv. or Split
Conventional
 
118 or 135
118 or 135
118
118 or 135
 
Med-Hvy.
Med.
Lt-Med
Med.
Steel
Mild, .2 to .3 Carbon
Medium, .4 to .5 Carbon
Tool, 1.2 Carbon
Forgings
 
50-100
45-80
40-60
40-60
 
Conventional
Conventional
Conventional
Conventional
 
118
118
118
118
 
Med-Hvy.
Med.
Med.
Med.
Alloy, 300 to 400 BHN
High Tensile
Rc 35-40
Rc 40-45
Rc 45-50
Rc 50-55
20-30
 
30-40
25-35
15-25
7-15
Conv. or Split
 
Conv. or Split
Conv. or Split
Conv. or Split
Conv. or Split
118 or 135
 
118 or 135
118 or 135
118 or 135
118 or 135
Med.
 
Med.
Med.
Lt-Med.
Lt-Med.
Maraging, Heat Treated
Maraging, Annealed
7-20
40-55
Conv. or Split
Conv. or Split
118 or 135
118 or 135
Med.
Lt-Med.
Titanium Alloys
Commercially Pure
5AI-2SN, 8AI-1 Mo-1V
2Fe-2Cr-Mo Annealed
6AI-4V, 4AI-4MN, 7AI-4Mo
5AI-2Sn, 8AI-1 Mo-1V
2Fe-2CR-Mo Solution
Treated & Aged
 
50-60
20-45
 
20-35
15-20
 
Heavy Duty Split
Heavy Duty Split
 
Heavy Duty Split
Heavy Duty Split
 
135
135
 
135
135
 
 
 
Med.
Med.
 
Med.
Med.
High Temperature Alloys
Cobalt Base, HS25, S816, V36
INCO 800, A286, N155
Nickel Base, Inconel 700
U500, Rene 41
Monel Metal
 
7-20
7-20
5-15
 
30-50
 
Heavy Duty Split
Heavy Duty Split
Heavy Duty Split
 
Heavy Duty Split
 
135
135
135
 
135
 
Med.
Med.
Med.
 
Med.
Stainless Steel
Free Machining, 303, 416, 420
Austenitic, 300 Series
Ferritic, 400 Series
Martensitic, Heat Treated
 
30-100
20-60
20-60
10-30
 
Heavy Duty Split
Heavy Duty Split
Heavy Duty Split
Heavy Duty Split
 
135
135
135
135
 
Med.
Med.
Med.
Med.
Plastics and Related Materials
Zinc Alloys
100-200
150-250
Low Angle
Conventional
90
118
Med-Hvy.
Med-Hvy.
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