G17, G18, and G19 – Plane Selection

Plane Selection

Circular milling operations (such as G02 and G03) must be aligned on a plane defined by two axes of motion.  This plane is selected by calling one of these functions.

  • G17 aligns the arc plane with the X and Y axes.
  • G18 aligns the arc plane with the X and Z axes.
  • G19 aligns the arc plane with the Y and Z axes.

Plane selection is modal, and is often programmed in the program header.