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What is the G code G68 G69?

Published in CNC Machining 2 mins read

G68 and G69 are G-code commands used in CNC machining to define and cancel coordinate rotation, respectively.

G68: Rotate Coordinate System

The G68 command rotates the coordinate system by a specified angle around a defined point.

  • Syntax: G68 X<x-coord> Y<y-coord> R<angle>
  • Parameters:
    • X<x-coord>, Y<y-coord>: Coordinates of the rotation center.
    • R<angle>: Rotation angle in degrees (clockwise for positive values).
  • Example: G68 X10 Y20 R45 rotates the coordinate system by 45 degrees clockwise around the point (10, 20).

G69: Cancel Coordinate Rotation

The G69 command cancels any active coordinate rotation set by the G68 command.

  • Syntax: G69
  • Example: G69 cancels the coordinate rotation previously set by G68 X10 Y20 R45.

Practical Applications

  • Machining complex shapes: G68 allows machining parts with angled features by rotating the coordinate system to align with the desired angle.
  • Simplifying programming: Rotating the coordinate system can simplify the programming of complex features, especially for angled holes or pockets.

Conclusion

G68 and G69 are essential G-code commands for rotating the coordinate system in CNC machining. They provide flexibility and efficiency in machining complex shapes by simplifying programming and aligning the coordinate system with desired angles.

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