
B-63943EN-1/02 16.MEASUREMENT
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16.4 COMPENSATION VALUE INPUT
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16.4.1 Input of tool offset value measured
Overview
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(X axis of the
basic three axes) and Z axis(Z axis of the basic three axes) 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.
Signal
Position record signal PRC <G040#6>
[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”.
CAUTION
To use this signal, set parameter PRC (No.5005#2)
to 1.