
13.MEASUREMENT B-63323EN-1/03
- 1288 -
13.4 AUTOMATIC TOOL LENGTH MEASUREMENT (G37)
By issuing G37 the tool starts moving to the measurement position and
keeps on moving till the approach end signal from the measurement
device is output. Movement of the tool is stopped when the tool tip
reaches the measurement position.
Difference between coordinate value when tool reaches the
measurement position and coordinate value commanded by G37 is
added to the tool length offset amount currently used.
Compensation data = (Current compensation data) + [(Measurement position reach
signal detection position) - (Coordinate value specified by G37)]
when the MDC bit (bit 0 of parameter 7300) is set to 1
Measurement
feedrate
Z
X
0
A (Start position)
Measurement position is
commanded with G37
B
C
The tool stops when the approach end signal
goes on.
Rapid
traverse
- Setting the workpiece coordinate system
Set the workpiece coordinate system so that a measurement can be
made after moving the tool to the measurement position. The
coordinate system must be the same as the workpiece coordinate
system for programming.
- Specifying G37
Specify the absolute coordinates of the correct measurement position.
Execution of this command moves the tool at the rapid traverse rate
toward the measurement position, reduces the federate halfway, then
continuous to move it until the approach end signal from the measuring
instrument is issued. When the tool tip reaches the measurement
position, the measuring instrument sends an approach end signal to the
CNC which stops the tool.