
14. MEASUREMENT
B–63833EN–1/02
838
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 error can
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)
OPERATOR’S MANUAL
(M series) (B–63844EN)
II.4.18 SKIP FUNCTION(G31)
Series 0i–B
OPERATOR’S MANUAL
(T series) (B–63834EN)
II.4.10 SKIP FUNCTION(G31)
OPERATOR’S MANUAL
(M series) (B–63864EN)
II.4.7 SKIP FUNCTION(G31)
Series 0i Mate–B
OPERATOR’S MANUAL
(T series) (B–63854EN)
II.4.7 SKIP FUNCTION(G31)
Warning
Note
Reference item