VU-TBR Cutting Conditions
List 3785: EXOCARB VU-TBR: Using Tip Radius (R1)
Hardness
< 30 HRC
30 - 45 HRC
45 - 55 HRC
Work Material Cutting Speed
Carbon Steel Alloy Steel
Hardened Steel Prehardened Steel
Hardened Steel Prehardened Steel
660 SFM
525 SFM
460 SFM
D=6 Aa = 0.004” D=8 Aa = 0.008” D=10 Aa = 0.010” D≥12 Aa = 0.012”
D=6 Aa = 0.004” D=8 Aa = 0.008” D=10 Aa = 0.010” D≥12 Aa = 0.012”
D=6 Aa = 0.004” D=8 Aa = 0.008” D=10 Aa = 0.010” D≥12 Aa = 0.012”
Depth of Cut
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Mill Dia.
Pitch
Pitch
Pitch
6 (R0.5 x R150 x 20°) 8 (R1 x R150 x 20°) 10 (R1.5 x R300 x 20°) 12 (R2 x R300 x 20°) 16 (R2.5 x R500 x 20°) 16 (R3 x R500 x 20°)
19500 13300 10300
244.1 169.3 130.0 157.5 118.2 114.2
15600 10700
173.3 118.2
13600
130.0
9300 7200 5800 4400 4200
86.7 67.0 82.7 63.0 59.1
Based on cusp height (See chart below)
Based on cusp height (See chart below)
Based on cusp height (See chart below)
8200 6600 5000 4800
90.6
8300 6300 6000
110.3
82.7 78.8
1. This chart should be used when machining with the Tip Radius, R1. 2. Use a rigid and precise machine and holder. 3. Use a coolant with low air-blow or fuming property according to the work material. MQL (oil mist coolant) is recommended for cutting hardened steels. 4.Using Tip Radius (R1)” is the guide to use the tip radius. Please adjust the rotation speed, feed rate and cutting pitch based on the cutting shape, machine rigidity, workpiece and holding conditions.
5. When chattering, vibration or abnormal cutting noise occurs, please adjust the rotation speed, feed rate and cutting pitch. 6. In order to change the rotation speed, both the rotation speed and the feed rate should be changed at the same ratio.
Theoretical Cusp Height
VU-TBR Taper Barrel Type
Cusp Height and Pitch
0.020 0.018 0.016 0.014 0.012 0.010 0.008 0.006 0.004 0.002 0
（mm）
Tip R
R0.5 R1 R1.5 R2 R2.5 R3
h
Pitch
0.1
0.2
0.3
0.4
0.5
0.7
0.6
（mm）
Pitch
h = 0.5 × ( 2×R1- (2×R1) 2 - P 2 )
h: Cusp Height P:Pitch R1: Tip R
osgtool.com
1487
End Mill Technical
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