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G CODES
June 1999
CIRCULAR P LANE S ELECTION (G17, G18, G19)
The plane used for circular motions must be comprised of two of X, Y, or Z. There are three G codes used to
select the plane; G17 for XY, G18 for ZX, and G19 for YZ. Each are modal and apply to all following circular
motions until another Group 02 code is found.
G17 XY Plane Selection Group 02
The G17 code is used to select the XY plane for circular motion. It is the default plane selection mode. In this
plane, circular motion is defined as clockwise for the operator looking down onto the X-Y table from above. This
is the motion of the tool relative to the table.
G18 ZX Plane Selection Group 02
The G18 code is used to select the ZX plane for circular motion. In the X-Z plane (G18), circular motion is
defined as clockwise for the operator looking towards the rear of the machine from the front control panel.
G19 YZ Plane Selection Group 02
The G19 code is used to select the YZ plane for circular motion. In the Y-Z plane (G19), circular motion is
defined as clockwise for the operator looking across the table from the side of the machine the control panel is
mounted.
The default plane selection when the machine is powered on is G17 for the X-Y plane. This means that a
circular motion in the plane of the X-Y table may be programmed without first selecting G17.
A helical motion is possible with G02 or G03 by programming the linear axis which is not in the selected plane.
This third axis will be interpolated along the specified axis in a linear manner while the other two axes will be
moved in the circular motion. The speed of each axis will be controlled so that the helical rate matches the
programmed feed rate.
If cutter radius compensation is selected (G41 or G42), you may only use the X-Y plane for circular motions
(G17). Cutter radius compensation is only available in the X and Y axes.
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