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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

Calculation Examples

Average WallTable of Factors for Speed Calculation of Ball Nos ap/De
Angle0.0030.0060.0100.0160.0200.0250.030
0.0°9.16.55.04.03.63.22.9
3.0°6.24.94.03.33.02.82.6
5.0°5.14.23.53.02.82.52.4
8.0°4.13.43.02.62.42.32.1
10.0°3.63.12.72.42.32.12.0
15.0°2.82.52.22.01.91.81.7
20.0°2.32.11.91.81.71.61.6
30.0°1.71.61.51.41.41.31.3
40.0°1.41.31.31.21.21.21.2
50.0°1.21.21.11.11.11.11.1
55.0°1.11.11.11.11.11.01.0
or cacuang rea cung spee, use ormua: asc cung spee FactorTiAlN or AlTiN Basic Cutting Speed Vc
Choose the coefficient according to the ap/D and average wall angle.Materialm/min
Example 1:Groupminmax
For Tool = 10mm and ap = 0,2mm for average wall angle 0°, ap/D ratioP3160– 180
equal 0,2/10 = 0,02. Factor equal 3.6.P4140– 160
Example 2: For Tool = 8mm and ap = 0,1mm for average wall angle 10°, ap/D ratioH1100– 140
equal 0,1/8 = 0,0125. Factor will be between 2.7 and 2.4, choose 2.6.H270– 120
Keep in mind shank diameter and length effect.H360– 90
If tool length out of the chuck is more than 2 x D please decrease feedH450– 70

per tooth by 15% each 1 x D.

Application example #1 =Application example #2 =
face milling a flat surfaceface milling a 10º average wall angle
D = 10mmD = 8mm
ap = 0,2mmap = 0,1mm
Average wall angle = 0°Average wall angle = 10°
Finishing H2Finishing H2
Starting vc from chart = 100Starting vc from chart = 100
ap/D = 0.02ap/D = 0,1/8 = 0,0125
Factor from table =Factor from table =
3.62.6
vc to programme into machine = 100 * 3.6 = 360 m/minvc to programme into machine = 100 * 2.6 = 260 m/min
RPM = 360* 1000/3.14/10 = 11460 RPMRPM = 260* 1000/3.14/10 = 7640 RPM