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

PROGRAMMING
15. COMPENSATION FUNCTION
B–62754EN/01
212
CAUTION
In a machine with reference positions, a standard position like the turret center can be placed
over the start position. The distance from this standard position to the nose radius center or the
imaginary tool nose is set as the tool offset value.
Setting the distance from the standard position to the tool nose radius center as the offset value
is the same as placing the tool nose radius center over the start position, while setting the
distance from the standard position to the imaginary tool nose is the same as placing the
imaginary tool nose over the standard position. To set the offset value, it is usually easier to
measure the distance from the standard position to the imaginary tool nose than from the
standard position to the tool nose radius center.
OFX
(Tool offset
in X axis)
OFX
(Tool offset
in X axis)
OFZ
(Tool offset
in Z axis)
OFZ
(Tool offset
in Z axis)
Setting the distance from the standard position
to the tool nose center as the tool offset value
Setting the distance from the standard position to
the imaginary tool nose center as the tool offset val-
ue
The start position is placed over the tool nose center The start position is placed over the imaginary tool nose
Fig15.2.1(b) Tool offset value when the turret center is placed over the start position
Unless tool nose radius compensation is
performed, the tool nose center path is the
same as the programmed path.
If tool nose radius compensation is used, accu-
rate cutting will be performed.
Tool nose center path
Programmed path
Start–
up
Start–
up
Programmed path
Fig15.2.1(c) Tool path when programming using the tool nose center
Tool nose center path
Without tool nose radius compensation, the
imaginary tool nose path is the same as the
programmed path.
With tool nose radius compensation, accurate
cutting will be performed.
Imaginary tool
nose path
Imaginary tool
nose path
Start–
up
Start–
up
Programmed path
Programmed path
Fig15.2.1(d) Tool path when programming using the imaginary tool nose

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