
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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Specify the measurement reference point on the machine and set the distance between the reference point
and measuring point (the sensing surface of the touch sensor) in the parameter for each sensing point.
1 Select the manual handle feed or continuous manual feed mode.
2 Turn on the switch on the machine operator’s panel for notifying the control unit that tool compensation is
to be measured. The PMC then turns on signal GOQSM for selecting the mode for writing tool compensa-
tion. Next, the control unit automatically switches the screen currently displayed on the CRT to the tool
geometry compensation screen and blinks the OFST status display at the bottom of the screen to notify
that preparation has been completed for measuring tool compensation.
3 Select the tool for which tool compensation is to be measured. This selection should be made prior to step
(1) if there is no other selection method than manual data input and memory program command. After a
tool has been selected, the PMC notifies the control unit of the compensation number of the selected tool
by means of tool compensation number input signals OFN0 to OFN5.
The tool compensation number should generally be the same as the tool number. Instead of using signals
OFN0 to OFN5, a parameter can be set so that the operator can select the tool compensation number on
the tool compensation setting screen.
4 Bring the tool into contact with the touch sensor by manual handle feed or continuous manual feed. The
PMC then turns on the manual feed interlock signal for the axis that corresponds to the sensing point of
the touch sensor that was contacted. When the tool comes into contact with the sensing surface in the
–X direction, the PMC turns on manual feed interlock signal –MIT1 for the negative direction of the first axis
(–X).
5 When the manual feed interlock signal for an axis, for example, manual feed interlock signal –MIT1 for the
negative direction of the first axis (–X), is turned on, the control unit stops manual feed for that direction.
At the same time, the control unit sets, in tool compensation memory, a tool geometry compensation that
is the difference between the machine coordinates and measurement reference distance (parameter set-
ting value) and sets the tool wear compensation value to 0.
Tool geometry compensation = (Machine coordinates obtained when the manual feed interlock signal is
turned on) – (Measurement reference distance corresponding to the manual feed interlock signal)