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(c) Position record signal (PRC)
[Classification]
Input signal
[Function] This signal is prepared for the tool compensation measuring value input function in the lathe
system. It is used to store in the control unit the data on the positions of the tool as it moves
around for tentative cutting. After measuring a dimension of the workpiece, input the mea-
sured value by the specified manual operation. The difference is then stored as the specified
tool compensation value. Refer to the Operator’s Manual for details.
[Operation] The control unit stores the current position along all control axes when it detects the rising
edge of the signal.
2.3.57 Method B for directly inputting tool compensation (for the Series 15–T and 15–TT)
Section 2.3.37 describes the methods of measuring tool compensation according to a program command and
by measuring the dimensions of a workpiece after trial cutting. Besides those methods, a lathe system permits
the methods stated below to be used for measuring tool compensation. Moreover, the workpiece reference
point along the Z–axis can be set by simple operation.
The signals in the table below are for the functions for measuring tool compensation and for setting the work-
piece reference point along the Z–axis.
Signal
Division Function
GOQSM Input Selects tool offset value write mode
+MIT1
1st axis (+) –direction (+X) manual feed interlock
-MIT1
1st axis (–) –direction (–X) manual feed interlock
+MIT2
2nd axis (+) –direction (+Z) manual feed interlock
-MIT2
2nd axis (–) –direction (–Z) manual feed interlock
+MIT3 3rd axis (+) direction (+Y) manual feed interlock
-MIT3 3rd axis (–) direction (–Y) manual feed interlock
OFN0-OFN5 Input Tool offset number input.
WOQSM Input Work coordinate system shift amount write mode select.
WOSET Input Shift amount write in work coordinate system.
Basic procedure for measuring tool compensation
A touch sensor as shown below should generally be prepared on the machine. It can detect the contact of a
tool when it is moved in the +X, –X, +Z, and –Z directions.
+X feed direction
contact face
-Z feed direction
contact face
+Z feed direcĆ
tion
contact face
-X feed direction
contact face
+X
+Z