The combination of the nose radius and the edge preparation has a significant influence on tool life, surface and
integrity of the machined part. It is very important to select the chamfer size and edge condition best suited to
There are four edge conditions available in the Insoll Tools CBN range:
S—Land: The negative land and honing cutting edge condition
The strength of this cutting edge and comprehensive performance are the best and is most widely edge in PCBN
T—Land: The negative land cutting edge condition
The negative land helps to improve the impact resistance of the cutting edges. Compared with S cutting edge, the
quality of the machined surface could be improved and the dimensional stability could be ensured.
E—Land: Honing by Er cutting edge condition
Honing can help to reduce micro-chipping and improve the integrity of the cutting edges.
F—Land: Sharp cutting edge condition
Sharp cutting edge can help to improve the roughness of the machining surface.
Chamfer angle and width
In general, the strength of the cutting edge on CBN inserts increases with increasing chamfer angle and width, but also
results in increased cutting forces and temperature.
If surface finish and dimensional accuracy are main requirements, a small chamfer will provide the best results. Cutting
forces and temperature will be reduced and there will be less vibration. In some cases, where surface finish is critical,
a honed edge (E-land) can be beneficial, even though the tool life will be shorter.