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High-Performance Solid Carbide End Mills • Hard Materials
Table of Factors to Maximise Ball Nose Cutting Speed for Hard Machining • Metric
Average Wall
Angle
0.0°
3.0°
5.0°
8.0°
10.0°
15.0°
20.0°
30.0°
40.0°
50.0°
55.0°
0.003
9.1
6.2
5.1
4.1
3.6
2.8
2.3
1.7
1.4
1.2
1.1
Calculation Examples
Table of Factors for Speed Calculation of Ball Nose
ap/D
0.006
0.010
0.016
6.5 5.0 4.0
4.9 4.0 3.3
4.2 3.5 3.0
3.4 3.0 2.6
3.1 2.7 2.4
2.5 2.2 2.0
2.1 1.9 1.8
1.6 1.5 1.4
1.3 1.3 1.2
1.2 1.1 1.1
1.1 1.1 1.1
0.020
3.6
3.0
2.8
2.4
2.3
1.9
1.7
1.4
1.2
1.1
1.1
0.025
3.2
2.8
2.5
2.3
2.1
1.8
1.6
1.3
1.2
1.1
1.0
For calculating real cutting speed, use formula: Basic cutting
speed * Factor
Choose the coefcient according to the ap/D and average wall angle.
Example 1:
For Tool = 10mm and ap = 0,2mm for average wall angle 0°, ap/D ratio
equal 0,2/10 = 0,02. Factor equal 3.6.
Example 2:
For Tool = 8mm and ap = 0,1mm for average wall angle 10°, ap/D ratio
equal 0,1/8 = 0,0125. Factor will be between 2.7 and 2.4, choose 2.6.
Keep in mind shank diameter and length effect.
If tool length out of the chuck is more than 2 x D, please decrease feed
per tooth by 15% each 1 x D.
Material
Group
P3
P4
H1
H2
H3
H4
TiAlN or AlTiN
Basic Cutting Speed Vc
m/min
min
160 –
140 –
100 –
70 –
60 –
50 –
0.030
2.9
2.6
2.4
2.1
2.0
1.7
1.6
1.3
1.2
1.1
1.0
max
180
160
140
120
90
70
Application example #1 =
face milling a flat surface
D = 10mm
ap = 0,2mm
Average wall angle = 0°
Finishing H2
Starting vc from chart = 100
ap/D = 0.02
Factor from table =
3.6
vc to programme into machine = 100 * 3.6 = 360 m/min
RPM = 360* 1000/3.14/10 = 11460 RPM
Application example #2 =
face milling a 10° average wall angle
D = 8mm
ap = 0,1mm
Average wall angle = 10°
Finishing H2
Starting vc from chart = 100
ap/D = 0,1/8 = 0,0125
Factor from table =
2.6
vc to programme into machine = 100 * 2.6 = 260 m/min
RPM = 260* 1000/3.14/10 = 7640 RPM
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