Chipbreaker and Grade Selection Guide for Turning Hardened Steel
Hardened Steel
Grades
● Coated CBN - SUMIBORON, Coated Carbide
● Uncoated CBN - SUMIBORON
990 1150
BNC2105 1st Recommendation
990
High-precision Machining BNC2115
1st Recommendation BNC2125
BN1000
A
660
660
BN2000 General-purpose Cutting
330
330
Finishing
General Machining BNC2020
BNC300 Interrupted Cutting
Interrupted Cutting BN350
BNC2010
AC5005S
0
0
Finishing
Roughing
Finishing
Roughing
Partially Interrupted
Continuous
Interrupted
Partially Interrupted
Continuous
Interrupted
SUMIBORON
L2
Chipbreakers LV / FV Chipbreaker : For chip control during finishing of hardened steel SV Chipbreaker : For chip control during carburised layer removal
.028
SV
.024
SV
.020
.016
LV
.012
LV
.008
FV
FV
.004
0
.004
.008
.012
CBN - SUMIBORON Break Master
L26
Feed Rate f (IPR)
Recommended Cutting Conditions
Hardened Steel
(Red text indicates 1st recommendation)
Cutting Conditions
Min. - Max.
Cutting Process
Grade
Depth of Cut a p (inch)
Cutting Speed v c (SFM)
Feed Rate f (IPR)
BNC2105 BNC2115 BNC2010 BN1000 AC5005S BNC2125 BNC2020 BN2000 BNC300
.001 - .008 .001 - .014 .001 - .014 .001 - .008 .001 - .040 .001 - .014 .001 - .020 .001 - .012 .001 - .012 .001 - .012
.001 - .006 .001 - .010 .001 - .010 .001 - .006 .001 - .004 .001 - .008 .001 - .016 .001 - .008 .001 - .008 .001 - .008
490 - 1150 360 - 1000 160 - 590 400 - 1000 130 - 330 360 - 1000 160 - 590 160 - 660 160 - 500 160 - 500
Continuous Cutting
General Cutting
Interrupted Cutting
BN350
A20
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