
8.COORDINATE VALUE AND DIMENSION NC FUNCTIONS B-63322EN/03
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8.2 POLAR COORDINATE COMMAND (G15, G16)
The end point coordinate value can be input in polar coordinates
(radius and angle). Use G15, G16 for polar coordinates command.
Format
G16; Polar coordinate system command cancel
G15; Polar coordinate system command
Plane selection of the polar coordinates is done same as plane selection
in circular interpolation, using G17, G18, G19.
Command radius in the first axis of the selected plane, and angle in the
second axis. For example, when the X-Y plane is selected, command
radius with address X, and angle with address Y. The plus direction of
the angle is counter clockwise direction of the selected plane first axis
+ direction, and the minus direction the clockwise direction.
Both radius and angle can be commanded in either absolute or
incremental command (G90, G91).
The center of the polar coordinates is the zero point of the workpiece
coordinates.
(However, if the local coordinates are set, it is the zero point of the
local coordinates.)
When the radius is specified with an incremental command, the center
of the polar coordinates is the current position.
Examples
Bolt hole cycle
N1 G17 G90 G16 ;
Specifying the polar coordinate command and selecting the XY
plane
Setting the zero point of the workpiece coordinate system as the
origin of the polar coordinate system
N2 G81 X100.0 Y30.0 Z-20.0 R-5.0 F200.0 ;
Specifying a distance of 100 mm and an angle of 30 degrees
- The zero point of the workpiece
coordinate system is set as the
origin of the polar coordinate
system.
- The XY plane is selected.
Y
150°
30°
100mm
270°
X