
14. MEASUREMENT
B–63833EN–1/02
850
This is a function of setting an offset value by key-inputting a workpiece
diameter manually cut and measured from the MDI keyboard.
First the workpiece is cut in the longitudinal or cross direction manually.
When the position record signal is turned “1” (prepare a button on the
machine operator’s panel) on completion of the cutting, the workpiece
coordinate value of X axis and Z axis at that time is recorded in the CNC.
Then, withdraw the tool, stop the spindle, and measure the diameter if the
cutting was on the longitudinal direction or measure the distance from the
standard face if the cutting was on the facing. (The reference face is made
as Z = 0.) When the measured value is entered on the offset value display
screen, NC inputs the difference between the input measured value and
the coordinate value recorded in NC, as the offset value of the offset
number.
If you release the tool without moving the tool in the axis along which an
offset value is entered but moves the tool along the other axis, an offset
value can be set without using the position record signal.
The workpiece coordinate system can be shifted using the technique of
directly inputting the measured value for offset. This technique is used
when the coordinate system planned in the program does not match with
the coordinate system actually set.
The procedures are the same as those for direct input for offset, except a
difference of using the standard tool on the work shift screen.
[Classification] Input signal
[Function] This signal is prepared for the function of input of offset value measured
A. It is used to store in the control unit the data on the positions of the
tool for tentative cutting. After measuring a dimension of the workpiece,
input the measured value by the specified manual operation. The
difference is then stored as the specified tool compensation value.
[Operation] The control unit stores the current position along X and Z axes when the
signal turns to “1”.
14.4
ENTERING
COMPENSATION
VALUES
14.4.1
Input of Offset Value
Measured A (T series)
General
Signal
Position record signal PRC
<G040#6>