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

PROGRAMMING
15. COMPENSATION FUNCTION
B–62764EN/01
254
Select tool length offset A, B, or C, by setting bits 0 and 1 of parameter
TLC,TLB No. 5001.
When G43 is specified, the tool length offset value (stored in offset
memory) specified with the H code is added to the coordinates of the end
position specified by a command in the program. When G44 is specified,
the same value is subtracted from the coordinates of the end position. The
resulting coordinates indicate the end position after compensation,
regardless of whether the absolute or incremental mode is selected.
If movement along an axis is not specified, the system assumes that a
move command that causes no movement is specified. When a positive
value is specified for tool length offset with G43, the tool is moved
accordingly in the positive direction. When a positive value is specified
with G44, the tool is moved accordingly in the negative direction. When
a negative value is specified, the tool is moved in the opposite direction.
G43 and G44 are modal G codes. They are valid until another G code
belonging to the same group is used.
The tool length offset value assigned to the number (offset number)
specified in the H code is selected from offset memory and added to or
subtracted from the moving command in the program.
(1) Tool length offset A/B
When the offset numbers for tool length offset A/B are specified or
modified, the offset number validation order varies, depending on the
condition, as described below.
O××××;
H01 ;
:
G43Z_ ; (1)
:
G44Z_H02 ; (2)
:
H03 ; (3)
:
(1) Offset number H01 is valid.
(2) Offset number H02 is valid.
(3) Offset number H03 is valid.
O××××;
H01 ;
:
G43Z_ ; (1)
:
G44Z_H02 ; (2)
:
H03 ; (3)
:
(1) Offset number H00 is valid.
(2) Offset number H02 is valid.
(3) Offset number H02 is valid.

D Selection of tool length
offse
D Direction of the offset
D Specification of the tool
length offset value
D When OFH (bit 2 of
parameter No. 5001) = 0
D When OFH (bit 2 of
parameter No. 5001) = 1

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