
9.TRACING CONTROL B-63662EN/01
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9.1 TRACING FUNCTION
The machine is equipped with a detector to measure the distance to
the surface of the workpiece. An analog signal generated in this
detector is sent to the CNC through a specified interface. This signal
enables gap control in which the Z-axis is controlled.
9.1.1 Interface
The detector produces 0V for the reference distance. The detector
output is proportional to a deviation from the reference distance.
The amplifier should be adjusted so that the analog signal becomes
±10V for a deviation of ±2mm from the reference distance.
Detector
Amplifier
Reference distance L
0
Workpiece
To the
CNC
+10V
-2mm
+2mm
Voltage
Deviation
-10V
The deviation for a voltage of ±10V is typically set to ±2mm. But it
can be set to ±4, ±6, ±8, or ±10mm using a parameter. The resolution
is 1µm for ±2mm. The resolution decreases as the deviation range is
increased. It becomes 5µm for ±10mm.
9.1.2 Reference Deviation
The tracing function controls the Z-axis so that it balances when the
detector produces 0 V. At this point, to change the gap between the
nozzle and workpiece, specify the reference deviation E0.
Detecto
Nozzle
E
0
= 0
L
0
-0.5
0.5mm
L
0
Workpiece
E
0
= 0.5mm
→
Detecto
Nozzle