Selecting The Speed; Standard Values For Cutting Speeds - Optimum optimill MH25V Betriebsanleitung

4.11

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. The service life of the tool can be increased and the
working result optimized by selecting the correct cutting speed.
The ideal cutting speed basically depends on the workpiece and the tool material. 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 Met-
all, 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 =
π ×
d
n = speed in rpm(revolutions per minute)
V = cutting speed in m/min (metres per minute)
d = tool diameter in m (metres)

4.11.1 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 SS [m/min]
Cutter head with HM [m/min]
This results in the following standard speeds, dependent on
mill diameter, mill type and material.
Tool diameter
[mm] plain milling cutters and
shell end mills
35
40
45
50
55
60
65
Version 1.0.1 dated 2015-12-17
Steel Grey cast iron
10 - 25 10 - 22
15 - 24 10 - 20
15 - 30 12 - 25
100 - 200 30 - 100
Steel Grey cast iron
10 - 25 m/min 10 - 22 m/min
Speed [rpm]
91 - 227 91 - 200
80 - 199 80 - 175
71 - 177 71 - 156
64 - 159 64 - 140
58 - 145 58 - 127
53 - 133 53 - 117
49 - 122 49 - 108
Original operating instructions
OPTIMUM
M A S C H I N E N - G E R M A N Y
Al
alloy
case-hardened
150 - 350
150 - 250
200 - 300
300 - 400
Al alloy
case-hardened
150 - 350
m/min
1365 - 3185
1195 - 2790
1062 - 2470
955 - 2230
870 - 2027
795 - 1860
735 - 1715
MH25V GB
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