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SPINDLE SPEED
Choose the speed on the basis of the material, hole diameter, type of drill and the required quality
of the drilling. The smaller the diameter of the hole, the higher the speed. Soft materials need a
higher speed than hard ones. Make sure to have the right speed for the hole diameter and the actual
material.
FIG. 24
See guide values for the speed in the table on the next page.
Guide values for speed
The speeds in the table below can be used as guide values when selecting the speed for different
diameters/combinations of material.
Hole
( Ø mm)
3
4
5
6
7
8
9
10
11
12
13
14
16
DRILLING HOLES
•
Mark the position of the centre of the hole on the workpiece with a punch. Lower the spindle
without starting it so that the tip of the drill just touches the workpiece and then centre the drill
and punch mark to each other. Start the spindle and lower it down so that the drill is pressed
against the workpiece, gently with just enough force for the drill to make a clean cut.
•
Feeding too slowly can risk overheating the drill.
•
Feeding too quickly risks overloading and stopping the motor, and can cause the drive belts to
slip, the workpiece to come loose, or the drill to break.
•
The tip of the drill may need cooling with a suitable coolant when drilling in metal.
62
Cast iron
Steel
2550
1600
1900
1,200
1530
955
1270
800
1090
680
960
600
850
530
765
480
700
435
640
400
590
370
545
340
480
300
Iron
Aluminium
2230
9500
1680
7200
1340
5700
1100
4800
960
4100
840
3600
740
3200
670
2860
610
2600
560
2400
515
2200
480
2000
420
1800
Bronze
8000
6000
4800
4000
3400
3000
2650
2400
2170
2000
1840
1700
1500
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