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4.6
Clamping the workpieces
CAUTION!
Injuries can be caused by parts flying off.
The workpiece is always to be fixed by a machine vice, jaw chuck or by another
appropriate clamping tool such as for the clamping claws.
4.7
Changing the speed range
ATTENTION!
Wait until the drilling and milling machine has come to a complete halt before changing
the speed using the gear switch.
There are two levers to switch over the gear to the desired spindle speed at the front side of the
machine. The following speeds are available in depending the used electric motor drive stage.
4.8
Selecting the speed
The correct speed is an important factor for milling. The speed determines the cutting speed by
which the cutting edges cut the material. By selecting the correct cutting speed, the service life
of the tool is increased and the working result is optimized.
The optimum cutting speed mainly depends on the material and on the material of the tool.
Higher speeds are possible with tools (mills) made from hard metal or cutting ceramics than
with tools made from high-alloy high speed steel (HSS). You will achieve the ideal cutting speed
by selecting the correct rotation speed.
Please refer to the following standard values or a table reference book (e.g. Tabellenbuch
Metall, Europa Lehrmittel, ISBN 3808517220) to determine the correct cutting speed for your
tool and the material to be cut.
The required speed is calculated as follows:
V
----------- -
n
=
d
n = speed in rpm(revolutions per minute)
V = cutting speed in m/min (metres per minute)
d = tool diameter in m (metres)
4.8.1
Standard values for cutting speeds
[m/min] with high-speed steel and hard metal for upcut milling.
Tool
Plain milling cutters and shell end mills [m/min]
Relieved milling cutters [m/min]
Cutter head with high speed steel [m/min]
Cutter head with carbide inserts [m/min]
This results in the following standard speeds, dependent on mill diameter, mill type and
material.
EN
MB4
70
Steel
Grey cast iron
10 - 25
15 - 24
15 - 30
100 - 200
Translation of original instruction
Al
alloy
case-hardened
10 - 22
150 - 350
10 - 20
150 - 250
12 - 25
200 - 300
30 - 100
300 - 400
Version 1.0.1 - 2021-11-18
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