B-63324EN/03 PROGRAMMING 14.COMPENSATION FUNCTION
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14.10 COORDINATE SYSTEM ROTATION (G68,G69)
A programmed shape can be rotated. By using this function it becomes
possible, for example, to modify a program using a rotation command
when a workpiece has been placed with some angle rotated from the
programmed position on the machine. Further, when there is a pattern
comprising some identical shapes in the positions rotated from a shape,
the time required for programming and the length of the program can
be reduced by preparing a subprogram of the shape and calling it after
Angle of rotation
Center of rotation
Fig.14.10 (a) Coordinate system rotation
G18 G68α_ β_R_ ;Start rotation of a coordinate system.
: Coordinate system rotation mode
G69 ; Coordinate system rotation cancel command
Meaning of command
G17(G18 ˝G19) : Select the plane in which
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 by a command (G17,
G18, or G19). The command specifies the coordinates of the
center of rotation for the values specified subsequent to G68.
R_ : Angular displacement with a positive value indicates counter