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15 Special Transformations
114
Fig. 15.1-1
Fig. 15.1-2
15 Special Transformations
15.1 Coordinate System Rotation (G68, G69)
A programmed shape can be rotated in the plane selected by G17, G18, G19 by the use of
command
G68 p q R
The coordinates of the center of rotation will be specified at
address p and q. The system will only interpret the data
written at coordinates p and q of the selected plane.
The entered p and q coordinate data are also interpreted as
rectangular coordinate data even when polar coordinate data
specifications are set up. Using G90, G91 or operator I, the
p and q coordinates of the center of rotation can be
specified as absolute or incremental data.
Unless one or both of p and q are assigned values, the
instantaneous axis position will be taken for the center of
rotation.
The angle of rotation is specified at address R. A positive or
negative value written at the address R represents a counter-
clockwise or a clockwise direction of rotation, respectively.
The value of R can be specified in 8 decimal digits. The
accuracy of rotation can be selected with reference to
parameter ANG.ACCU. If its value is 0 or 1, the accuracy
of calculating the rotation will be 0.001° or 0.00001°,
respectively.
The value specified for R may be absolute or incremental.
When the angle of rotation is specified as an incremental
data, the value of R will be added to the previously
programmed angles.
The rotation can be canceled with command
G69.
The coordinates of the center of rotation and the angle will be deleted. That instruction may
accompany other commands as well.