
B-63322EN/03 NC FUNCTIONS 14.TOOL COMPENSATION FUNCTION
- 167 -
14.1 TOOL LENGTH OFFSET
This function can be used by setting the difference between the tool
length assumed during programming and the actual tool length of the tool
used into the offset memory. It is possible to compensate the difference
without changing the program.
Specify the direction of offset with G43 or G44. Select a tool length
offset value from the offset memory by entering the corresponding
address and number (H code).
- Direction of the offset
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. By setting bit 2 (G43) of parameter
No. 2401 or bit 3 (G44) of parameter No. 2401, G43 or G44 can be set
upon power-up.
- Specification of the tool length offset value
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.
The tool length offset value may be set in the offset memory through the
MDI panel.
The range of values that can be set as the tool length offset value is as
follows.
Specify this distance as
the value of tool length
offset.
Tool assumed during
programming
Actual tool