OPTIMUM
M A S C H I N E N - G E R M A N Y
Operation
©
201
0
US
Page 27
Stand 27 / 08 / 2010
Version 1.0.6
BF 30 Vario
Mill Drill
4.7
Changing the speed range
ATTENTION!
Wait until the mill drill has come to a complete halt before changing the speed using the
gear switch.
Select gear level.
H = rapid
M = middle
L = low
Adjust the speed with the potentiome-
ter. The speed and thus the cutting
speed depends on the material of the
workpiece, the milling cutter diameter
and the cutter type.
Fig. 4-5: mill drill head
4.8
Selecting the speed
For milling operations, the essential factor is the selection of the correct speed. The speed
determines the cutting speed of the cutting edges which cut the material. By selecting the cor-
rect cutting speed, the service life of the tool is increased and the working result is optimised.
The optimum cutting speed mainly depends on the material and on the material of the tool. With
tools (milling cutters) made of hard metal or ceramic insert it is possible to work at higher speeds
than with tools made of high-alloyed high-speed steel (HSS). You will achieve the correct cut-
ting speed by selecting the correct speed.
In order to determine the correct cutting speed for your tool and for the material to be cut, you
may refer to the following standard values or a table reference book (e.g. Machinery's Handbook
ISBN 0-8311-2424-5, Insert Pgs. 30a & 30b (attached)).
The required speed is calculated as follows:
4.8.1
Standards values for cutting speeds
[FPM] with high-speed steel and hard metal in conventional milling
Selector switch gear
level
Tool
Steel
Grey Cast Iron
Age- Hardened
Al alloy
Peripherial and side milling (FPM)
33 - 82
33 - 72
492 - 1,148
Relieved form cutters (FPM)
49 - 79
33 - 66
492 - 820
Inserted tooth cutter with SS (FPM)
49 - 79
39 - 82
656 - 984
Inserted tooth cutter with HM (FPM)
328 - 656
98 - 328
984 - 1,312
