A closer study of the cutting edge geometry reveals two important angles on the insert:
- rake angle (γ)
- cutting edge angle (β)
The macro geometry is developed for work under light, medium or heavy conditions.
- L (Light) geometry has a more positive, but weaker edge (large γ, small β)
- H (Heavy) geometry has a stronger, but less positive edge (small γ, large β)
The macro geometry affects many parameters in the cutting process. An insert with a strong cutting edge can work at higher loads, but also generates higher cutting forces, consumes more power and generates more heat.
Material optimized geometries are designated with the ISO classification letter. For example, geometries for cast iron: KL, KM, KH.
Insert corner design
The most important part of the cutting edge for producing the surface is the parallel land bs1 or, when applicable, a convex wiper land bs2, or corner radius rε.