
B–64113EN–1/01
11. PROGRAM COMMAND
789
A programmed shape can be rotated. By using this function it is possible
to modify a program using a rotation command. This is useful when a
workpiece has been placed with some angle rotated from the programmed
position on the machine. This is also useful when machining the same
pattern.
Angle of rotation
Center of rotation
Y
X
0
Fig. 11.12 (a) Coordinate system rotation
G17 (G18 or G19) : Select the plane that contains the figure to be rotated.
α_β_ Absolute command for two of the x_,y_,and Z_ axes that
correspond to the current plane selected. The command
specifies the coordinates of the center of rotation.
R_ A positive angular displacement indicates counter
clockwise rotation. Parameter 5400#0 selects whether
the specified angular displacement is always
considered an absolute value or is considered an
absolute or incremental value depending on the specified
G code (G90 or G91).
Least input increment : 0.001 deg
Valid data range : –360.000 to 360.000
G68 (G68.1)α_β_R_ ; Start rotation of a coordinate system.
Coordinate system rotation mode
(The coordinate system is rotated.)
G69 (G69.1); Coordinate system rotation cancel command
FORMAT
MEANING OF COMMAND
G17
G18
G19
Note:G68/G69 for M series, G68.1/G69.1 for T series.
11.12
COORDINATE
SYSTEM ROTATION
General