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DRILL SPEED MATERIAL TABLE
12 Speed
Spindle
D
C
B
A
Recommended Drill Size per Material
Average Guide
Speed
50Hz
2450-2500-2580 rpm
1580-1750-1870 rpm
1250-1290-1330 rpm
790-830-900 rpm
500-540-600 rpm
Zinc
Wood
Diecast
inches
mm
inches
mm
5/16"
7.9
3/16
4.8
3/8
9.5
1/4
6.4
5/8
15.9
3/8
9.5
7/8
22.2
1/2
12.7
1
1
/
31.8
3/4
19
4
Jockey Pulley
Aluminium
Plastic
or Brass
inches
mm
inches
mm
11/64
4.4
5/32
4.0
7/32
5.6
3/16
4.8
11/32
8.7
5/16
7.9
15/32
11.9
7/16
11.1
11/16
17.5
5/8
15.9
22
Motor
Cast Iron
Steel
and Bronze
Mild and
Malleable
inches
mm
inches
mm
7/16
2.8
3/32
2.4
1/8
3.2
3/32
2.4
1/4
6.4
5/32
4.0
11/32
8.7
1/4
6.4
1/2
12.7
3/8
9.5
4
3
2
1
Steel Cast
Steel
and
Stanless and
Carbon
Tool
inches
mm
inches
mm
1/16
1.6
1/32
0.8
1/16
1.6
3/64
1.2
1/8
3.2
1/16
1.6
3/16
4.8
1/8
3.2
5/16
7.9
1/4
6.4
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