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
Fig 1
±0.02
RE
APMX
LF
I
Body
Dimensions ( mm )
Radius RE
Dia. DC
Cutting Edge Length APMX
Overall Length LF
Shank Dia. DMM
Cat. No.
Fig
BNBS2020S BNBS2030S BNBS2040S BNBS2060S BNBS2080S BNBS2100S BNBS2120S
1 1 1 1 1 1 1
1.0
2.0
1.5
50
4
1.5
3.0
2.0
60
6
2.0
4.0
3.0
70
6
3.0
6.0
4.5
80
6
4.0
8.0
5.5
90
8
5.0
10.0
6.5
100
10
6.0
12.0
7.5
110
12
Grade: BN350
Recommended Cutting Conditions 1. Use a rigid 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 GS MILL Hard Ballnose instead ( → I132).
Radius Milling
p
Work Material Cutting Conditions
f
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
18,000 13,000
700 15,000 530 11,000
8,800 6,600 5,300 4,400
7,400 5,600 4,500 3,700
610 460 630 530
a
0.01DC 0.02DC
0.01DC 0.02DC
Standard Depth of Cut
p
p f
I 119
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