CBN - SUMIBORON Ballnose Endmills BNBS Type
Hardened Steel 45 to 55HRC
Hardened Steel 55 to 60HRC
Hardened Steel 60 to 65HRC
Pre-hardened Steel
Ballnose
Flutes
Side Milling
Face Milling
R-Grooving
Profiling
● Combination of Special Grade and Spiral Cutting Edge Design: The combination of a special tough SUMIBORON grade with a unique cutting edge design is a breakthrough for high efficiency and smooth endmilling of hardened steels.
L
Fig 1
±0.02
RE
APMX
LF
Body
Dimensions (mm)
Radius RE
Dia. DC
Cutting Edge Length APMX
Overall Length LF
Shank Dia. DMM
Cat. No.
Stock
Fig
BNBS 2020S BNBS 2030S BNBS 2040S BNBS 2060S BNBS 2080S BNBS 2100S BNBS 2120S
1.0 1.5 2.0 3.0 4.0 5.0 6.0
2.0 3.0 4.0 6.0 8.0
1.5 2.0 3.0 4.5 5.5 6.5 7.5
50 60 70 80 90
4 6 6 6 8
1 1 1 1 1 1 1
10.0 12.0
100 110
10 12
Grade: BN350
Recommended Cutting Conditions 1. Use a high-rigidity machine and select a high cutting speed with a low feed rate. 2. Use dry cutting conditions. 3. Make overhang as short as possible. 4. If the work material hardness is lower than 50HRC, try the GSX Ballnose endmill .
Radius Milling
p f
Part Material Cutting Conditions
Hardened Steel (50-57HRC)
Hardened Steel (58-65HRC)
Spindle Speed (min -1 )
Feed Rate (mm/min)
Spindle Speed (min -1 )
Feed Rate (mm/min)
RE ( mm )
26,000 1,100 22,000
1.0 1.5 2.0 3.0 4.0 5.0 6.0
670 450 330 450 330 400 330
700 15,000 530 11,000
18,000 13,000 8,800 6,600 5,300 4,400
610 460 630 530
7,400 5,600 4,500 3,700
0.01DC 0.02DC
0.01DC 0.02DC
a p p f
Standard Depth of Cut
Performance
Part Material : D2 Tool Steel (60HRC Hardness )
Actual Cutting Length : 365 Linear Feet, v B = .005 ank wear” Finished Surface Roughness : Radial Feed Ry1.8μm,
Continued Machining Possible
BN350
Axial Feed Direction Ry2.2μm
825 SFM .00157 IPT .0118” .0118” BNBS2100S
Cutting Speed Feed Rate f Pitch Feed P f Depth of Cut a p Tool
Radial Feed
Feed Direction
Results
× 5,000
× 5,000
L132
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