Advice on drilling workpieces, Declaration of conformity, Always use sharp tools – Kompernass PTBM 350-13 User Manual
Page 7: Cool the drill bit with a suitable liquid, Small drills require a high drill speed, The correct speed is different for each material, The table gives the approximate rotation speed
ADVICE ON DRILLING WORKPIECES
The following points should be observed at all times:
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always use sharp tools
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cool the drill bit with a suitable liquid
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use a special drill bit for drilling into stainless steel
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for very hard materials use a higher pressure at lower speed setting
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for soft materials apply light pressure at a higher speed
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Attention: too high a pressure overloads the motor and reduces the drilling speed
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small drills require a high drill speed
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larger drills require a lower drill speed
The following table gives further helpful advice:
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the correct speed is different for each material
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the cutting speed is dependent on the diameter of the drill and the rotation speed
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the table gives the approximate rotation speed
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please note that an average speed has been calculated for the listed materials and the rotation
speeds have been rounded
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in some cases the calculated cutting speeds (CS) cannot be selected in practice - use the nearest
available value
Drill size
Material
CS
2
3
4
5
6
7
8
9
10
13
Wood, soft
300 rpm
max.
max.
max.
max.
max.
max.
max.
max.
max.
max.
Wood, medium
180 rpm
max.
max.
max.
max.
max.
max.
max.
max.
max.
max.
Aluminium "hard“
120 rpm
max.
max.
max.
max.
max.
max.
max.
max.
3800
2950
Wood “hard”, copper
60 rpm
max.
max.
max.
3800
3200
2700
2400
2100
1900
1500
Steel or sheet metal
35 rpm
max.
3700
2800
2250
1850
1600
1400
1250
1100
850
Aluminium “soft”
30 rpm
max.
3200
2400
1900
1600
1350
1200
1050
950
700
Structural steel
25 rpm
4000
2650
2000
1600
1300
1150
1000
900
800
600
Alloy steel
10 rpm
1600
1100
800
650
500
450
400
350
300
250
Stainless steel (VA steel)
10 rpm
1250
850
650
500
400
350
300
280
250
200
DECLARATION OF CONFORMITY
We, Kompernaß Handelsgesellschaft mbH, Burgstr. 21, D-44867 Bochum, Germany,
declare that this product complies with the following EU directives:
Machinery Directive (98/37 EC), Low Voltage Directive (73/23 EEC, 93/68 EEC), Electromagnetic
Compatibility (89/336 EEC, 93/68 EEC) in accordance with the applicable standards, and confirm
this with the CE mark.
Type/machine description: PARKSIDE BENCH DRILL PTBM 350-13
Bochum, 31.08.02
Hans Kompernaß
- Managing Director -
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