Fanuc Series 15i/150i-MA (Programming) Operators Manual

14.COMPENSATION FUNCTION PROGRAMMING B-63324EN/03
- 470 -
Explanation
- G code for selecting a plane: G17,G18 or G19
The G code for selecting a plane (G17,G18,or G19) can be specified
before the block containing the G code for coordinate system rotation
(G68).
CAUTION
G17, G18 or G19 must not be designated in the mode
of coordinate system rotation.
- Least input increment for specifying coordinate system rotation angles
The least input increment for specifying coordinate system rotation
angles is 0.001 degree or 0.00001 degree. When bit 2 (RTR) of
parameter No. 6400 is set to 0, 0.00001 degree is used; when the bit is
set to 1, 0.001 degree is used.
NOTE
When a decimal fraction is used to specify angular
displacement (R_), the 1s digit corresponds to
degree units.
- Center of rotation
When α_ β_ is not programmed, the tool position when G68 was
programmed is assumed as the center of rotation.
CAUTION
The center of rotation for an incremental command
programmed after G68 but before an absolute
command is the tool position when G68 was
programmed.
- specify angular displacement (R_)
Bit 0 of parameter 6400 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).
When R_ is not specified, the value specified in parameter 6411 is
assumed as the angular displacement.
- Tool compensation
Cutter compensation, tool length compensation, tool offset, and other
compensation operations are executed after the coordinate system is
rotated.
- Relationship with three-dimensional coordinate conversion (G68, G69)
Both coordinate system rotation and three-dimensional coordinate
conversion use the same G codes: G68 and G69. The G code with I, J,
and K is processed as a command for three-dimensional coordinate
conversion. The G code without I, J, and K is processed as a command
for two-dimensional coordinate system rotation.

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