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
Part Material
f
Hardened Steel (50-57HRC)
Hardened Steel (58-65HRC)
Cutting Conditions
Spindle Speed (min -1 ) 26,000 18,000 13,000
Feed Rate (mm/min)
Spindle Speed (min -1 ) 22,000 15,000 11,000
Feed Rate (mm/min)
RE ( mm )
1,100
1.0 1.5 2.0 3.0 4.0 5.0 6.0
670 450 330 450 330 400 330
700 530 610 460 630 530
8,800 6,600 5,300 4,400
7,400 5,600 4,500 3,700
a
0.01DC 0.02DC
0.01DC 0.02DC
Standard Depth of Cut
p
p f
Performance
Part Material : D2 Tool Steel (60HRC Hardness )
Actual Cutting Length : 365 Linear Feet, v
B = .005 flank wear”
Continued Machining Possible
BN350
Finished Surface Roughness : Radial Feed Ry1.8μm,
Axial Feed Direction Ry2.2μm
825 SFM .00157 IPT .0118” .0118” BNBS2100S
Cutting Speed
Radial Feed
Feed Direction
Feed Rate f
Results
Pitch Feed P f
Depth of Cut a p
× 5,000
× 5,000
Tool
L132
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