Set YZ plane. Planes are used with arcs, circles and cycles.
G19 is a G-code used to select the YZ plane for the G02 and G03 commands. It is used to specify that the circular interpolation is to be performed in the YZ plane. This plane is commonly used for operations that require circular interpolation in the horizontal plane, such as facing or contouring.
G17, G18 are other codes used to select different planes for circular interpolation. G17 selects the XY plane and G18 selects the XZ plane.
For example, G19 G03 Y10 X0 Z5 I0 J0 K1 F100 would move the tool in a counter-clockwise arc in the YZ plane, with the center of the arc at coordinates (0,0), ending at coordinates (0,10,5), at a feed rate of 100 units per minute.
G19
G19