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Tool Nose Radius Compensation (TNRC) in CNC

 


Tool Nose Radius Compensation (TNRC) in CNC

In CNC turning, the cutting tool typically has a rounded tip, known as the tool nose radius (TNR). While programming, we often consider the tool tip as a sharp point for simplicity. However, this simplification leads to inaccuracies when machining contours, tapers, and radii. Tool Nose Radius Compensation (TNRC) is a function in the CNC control that accounts for the actual radius of the tool nose, ensuring the programmed path results in the desired workpiece geometry.  

Here's a detailed breakdown:

What it is:

  • TNRC is a software-based compensation method.
  • It instructs the CNC machine to automatically adjust the programmed tool path.  
  • The adjustment ensures that the cutting edge of the tool, rather than the theoretical sharp point, follows the intended part profile.

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