FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
15. COMPENSATION FUNCTION
B–62764EN/01
354
(α, β)
X
Z
Center of
rotation
Angle of rotation R (incremental value)
Angle of rotation (absolute value)
Fig15.10 (b) Coordinate system rotation
NOTE
When a decimal fraction is used to specify angular
displacement (R_), the 1’s digit corresponds to degree
units.
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). G17, G18 or G19 must not be designated in the mode of coordinate
system rotation.
As for the incremental position commands designated between the G68
block and a block with an absolute command; it is regarded that the
position where G68 was designated is the center of rotation (Fig. 15.10
(c) ).
When α_ and β_ are omitted, the position where G68 is commanded is
set as the center of rotation.
When angle of rotation is omitted, the value set to parameter (No. 5410)
is regarded as the rotation angle. The coordinate system rotation is
cancelled by G69;
G69 may be designated in the same block as the other commands. Tool
offset, such as cutter compensation, tool length offset, or tool offset, is
performed after the coordinate system is rotated for the command
program.
WARNING
The first move command after G69 must be specified as an
absolute command.
Explanations
D G code for selecting a
plane: G17,G18 or G19

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