
17. MEASUREMENT FUNCTIONS
B–63002EN/01
NC FUNCTION
210
Setting of tool compensation value
Previously set the distance from the measurement reference position
(a particular point on the machine) to the measuring position (the touch
sensor contact face) to the parameter as the reference value.
As the tool of which the offset amount is to be measured is selected and
is positioned at the measuring position (contact the touch sensor), the
contact detection signal (tool compensation value write signal) from
the touch sensor is received, and the difference between the machine
coordinate value at that time (= the distance from the measured tool
nose tip position at the machine reference position (machine zero
point) to the measuring position) and the reference value (parameter
value) is set in the tool offset amount memory as the tool geometry
offset amount of that tool. The corresponding tool wear offset amount
becomes zero.
Tool offset
amount to
be set
Machine coordi-
nate value when
tool compensa-
tion value write
signal turns “1”
Reference value
(value of parameter)
corresponding to
tool compensation
value write signal
=+
The tool offset amount to be set depends on how to determine the
measurement reference position.
Setting of work coordinate system shift amount
The work coordinate system shift amount along the Z axis is to be set
as follows. When the tool touches the end face of the workpiece, the
touch detection signal (workpiece coordinate system shift write
signal) is output. This signal is used to set the workpiece coordinate
system shift, calculated by subtracting the tool geometry
compensation value (shift of coordinate system due to tool geometry
compensation) from the current machine coordinate (distance between
the end face of the workpiece and the tip of the measurement tool when
it is at the machine reference position (machine zero point)). In this
case the tool geometry offset amount corresponding to the tool must
be programmed previously.
Machine
coordinate value
of Z axis (Zt)
Work coordinate
system shift amount
along Z axis to be
set (EXOFSz)
Tool geometry offset
amount of Z axis of
corresponding tool
(OFSz)
=
+
By the above procedure the work coordinate system with the work edge
(sensor contact point) being taken as the work coordinate system zero
point of the Z axis (the program zero point) is set when the tool is selected
by the program command (T code).
Setting method