21
OPERATION (cont.)
Note:
All drill speed values are in RPM to match the digital display.
Countersinking and centre-drilling
With this working speed table, you can also countersink and center-drill. Please observe that
countersinking should be performed at the lowest speed, while a high speed is required for
center-drilling.
Working speed table
Ensure that you drill at the proper speed. Drill speed is dependent on the diameter of the
drill bit and the material in question.
The table below acts as a guide only for selecting the proper speed for various materials.
Note:
The drill speeds specified are a guide only.
Drill bit Ø
Cast iron
Steel
Iron
Aluminium
Bronze
3mm
2550
1600
2230
-
-
4mm
1900
1200
1680
-
-
5mm
1530
955
1340
-
-
6mm
1270
800
1100
-
-
7mm
1090
680
960
-
-
8mm
960
600
840
-
-
9mm
850
530
740
-
-
10mm
765
480
670
-
2400
11mm
700
-
610
-
2170
12mm
640
-
560
2400
2000
13mm
590
-
515
2200
1840
14mm
545
-
480
2000
1700
16mm
480
-
-
1800
1500
Содержание FBDDP-7500
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