
B--63003EN--1/02
14. MEASUREMENT
1169
WARNING
Disable feedrate override, dry run, and automatic
acceleration/deceleration (enabled with parameter No.
6200#7 SKF=1) when the feedrate per minute is specified,
allowing for reducing an error in the position of the tool when
a skip signal is input. These functions are enabled when the
feedrate per rotation is specified.
NOTE
1 The G31 block is always set to G01 mode. The feedrate is
specified by an F code.
2 When the measuring motion is made by utilizing the skip
signal, program a constant feedrate; otherwise, if the
feedrate changes, the measuring error will be noticeable.
With a constant feedrate, the maximum measuring errorcan
be calculated as follows:
ERRmax: Maximum measuring error (mm or inch)
Fm : Measuring feedrate (mm/min or inch/min)
3 Overtravel amount Qmax after skip signal has been turned
to “1” is calculated by the following:
Qmax : Overtravel amount (mm or inch)
Fm : Feedrate (mm/min or inch/min)
Tc : Cutting time constant (ms)
Ts : Servo time constant (ms) (1 loop gain)
#1
: The value becomes 28 when the skip signal SKIPP
<G006#6> is used. (Also it changes according to
the processing time of ladder program).
ERRmax = Fm
60 1000
14
Qmax = Fm
60 1000
11
(20
#1
+Tc+Ts)
Warning
Note