CNC G Code G17, G18, and G19
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.
See also: Haas Manual