15. Measurement Support Functions
15.1 Automatic Tool Length Measurement; G37.1
545
Detailed description
(1) Operation with G37.1 command
Speed
Rapid traverse rate
Measurement
allowable range
Distance
Operation 1
Operation 2
Operation 3
Offset amount
Normal completion
Alarm stop (P607)
Alarm stop (P607)
D(d) D(d)
F(Fp)
R(r)
Measuring
position
Stop point
Sensor
output
Or no detection
(2) The sensor signal (measuring position arrival signal) is used in common with the skip signal.
(3) The feedrate will be 1mm/min if the F command and parameter measurement speed are 0.
(4) An updated offset amount is valid unless it is assigned from the following Z axis (measurement
axis) command of the G37.1 command.
(5) Excluding the delay at the PLC side, the delay and fluctuations in the sensor signal processing
range from 0 to 0.2ms.
As a result, the measuring error shown below is caused.
Maximum measuring error (mm) = Measuring speed (mm/min)
•
1
60
•
0.2 (ms)
1000
(6) The machine position coordinates at that point in time are ready by sensor signal detection,
and the machine will overtravel and stop at a position equivalent to the servo droop.
Maximum overtravel (mm)
= Measuring speed (mm/min)
•
1
60
•
1
Position loop gain (s
−
1
)
The standard position loop gain is 33 (s
−
1
).