The difference between the sharp edge and radis edge

2025-10-09

Sharp Cutting Edge

Definition:
A sharp cutting edge has a 90° corner between the cutting face and flank of the tool.

Characteristics:

Produces precise, well-defined corners
Has high cutting force concentration
More likely to chip or wear quickly, especially when machining hard materials
Suitable for roughing or general-purpose cutting

Advantages:

Disadvantages:

Radius (R-type) Cutting Edge

Definition:
A radius edge has a rounded corner instead of a sharp one — typically with a radius value like R0.2, R0.5, or R1.0.

Characteristics:

Advantages:

Disadvantages:

Summary Table

Feature	Sharp Edge	Radius (R-type) Edge
Edge shape	90° corner	Rounded (R0.2–R2.0)
Cutting stress	High, concentrated	Lower, distributed
Tool strength	Weaker	Stronger
Surface finish	Average	Smooth and fine
Tool life	Shorter	Longer
Best for	Roughing, soft materials	Finishing, hard materials, mold machining

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