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

your application.

Edge condition

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

cutting tools.

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.

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