G68 and G69 Coordinate Rotation Mode

Overview

• Rotates coordinate system around a current tool position or a specified point in the active plane.

Command Format

• Syntax: G68 X... Y... Z... R...
• X... Y... Z...
  • Specifies the rotation center position on the currently active plane set by G17, G18, or G19.
  • (X, Y, Z) should be set appropriately for the currently active plane
  • G17: X... Y... (Z ignored)
  • G18: X... Z... (Y ignored)
  • G19: Y... Z... (X ignored)
  • If not specified, then the current tool position will be used.
• R...
• Specifies the angle of rotation (in degrees) for the active plane to rotate
• Positive R value - Counterclockwise
• Negative R value - Clockwise

• Syntax: G69

• Cancels the effects of a prior G68 rotation

Examples

• G17 G68 X0 Y0 R90
• Performs a 90° rotation of the XY plane around point X0 Y0
  • This 90° rotation would result in the new X-axis being in the same direction as the old Y-Axis
  • The new Y-axis would then be in the opposite direction of the old X-axis, i.e., new Y-Axis = negative old X-axis
• Future motion commands, and reported feedback positions will now be in this rotated coordinate system

Details

• The G68 and G69 commands must not include other G-codes on the same line.
• When G91 Incremental Mode is active, then the specified X and Y center positions are treated as relative values from the current position.

See Also:

• G17, G18, G19 G17 G18 G19 : Plane Selection