FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
15. COMPENSATION FUNCTION
B–62754EN/01
218
The workpiece position against the toll changes at the corner of the
programmed path as shown in the following figure.
Workpiece
position
Workpiece
position
G42
G42G41
G41
A
A
B
C
B
C
Although the workpiece does not exist on the right side of the
programmed path in the above case. the existence of the workpiece is
assumed in the movement from A to B. The workpiece position must not
be changed in the block next to the start–up block. In the above example,
if the block specifying motion from A to B were the start–up block, the
tool path would not be the same as the one shown.
The block in which the mode changes to G41 or G42 from G40 is called
the start–up block.
G40 _ ;
G41 _ ; (Start–up block)
Transient tool movements for offset are performed in the start–up block.
In the block after the start–up block, the tool nose center is positioned
Vertically to the programmed path of that block at the start position.
G40
(G42)
G42 (Start–up)
D Tool movement when the
workpiece position
changes
D Start–up

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