How to choose a suitable corner radius for cnc turning inserts?

Due to the different shape of the inserts, the tip angle changes from the minimum 35° to the round blade, and the corresponding tip angle is selected according to different workpieces.

Each shape has its own unique characteristics:

  • Some provide the high strength required for roughing
  • Some have good accessibility during profiling cutting

Each shape also has its own limitations. For example: high accessibility during machining means that the cutting edge strength is worse.

What’s the difference between a big tip angle and a small tip angle?

Big tip angleSmall tip angle
Stronger cutting edge
Higher feed rate
Increase cutting force
Increase vibration
Weaker cutting edge
Increase accessibility
Reduce cutting force
Reduce vibration

What’s the difference between a big corner radius and a small corner radius?

Big corner radiusSmall corner radius
Very high feed rate
Large depth of cut
High cutting edge safety
Increase radial pressure
Best for small depth of cut
Reduce vibration
Low cutting edge strength

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