
14. MEASUREMENT
B--63003EN--1/02
1170
Series
16i/160i/18i/180i
OPERATOR’S MANUAL
(For Machining Center)
(B--63014EN)
II.4.16 SKIP FUNCTION(G31)
OPERATOR’S MANUAL
(For Lathe) (B --63004EN)
II.4.13 SKIP FUNCTION(G31)
Series 21i/210i
OPERATOR’S MANUAL
(For Machining Center)
(B--63094EN)
II.4.8 SKIP FUNCTION(G31)
OPERATOR’S MANUAL
(For Lathe) (B --63084EN)
II.4.10 SKIP FUNCTION(G31)
Series 20i
OPERATOR’S MANUAL
(For Milling) (B--63384EN)
II.4.6 SKIP FUNCTION(G31)
OPERATOR’S MANUAL
(For Lathe) (B --63374EN)
II.4.8 SKIP FUNCTION(G31)
The skip function operates based on a high-speed skip signal (HDI0 ~
HDI7 : connected directly to the CNC; not via the PMC) instead of an
ordinary skip signal (X004#7). In this case, up to eight signals can be
input. The Series 21i/210i , however, uses just a single high--speed skip
signal (HDI0).
Delay and error of skip signal input is 0 ~ 2 msec at the CNC side (not
considering those at the PMC side).
This high-speed skip signal input function keeps this value to 0.004 msec
or less, thus allowing high precision measurement.
The skip function causes the NC to memorize the “current position” of
the tool when a skip signal is input. However, the “current position”
includes a delay in the servo system. In other words, the “current
position” deviates by the distance corresponding to the servo delay from
the position where the tool actually was when the skip signal was input.
This deviation can be calculated from the positional error in the servo
system and the number of remaining pulses due to feedrate acceleration/
deceleration in the NC. Taking this deviation into account eliminates the
necessity to include the servo delay in a measurement error.
The deviation of the “current position” can be compensated for by either
of the following two types, using parameter SEA (bit 0 of parameter No.
6201) or parameter SEB (bit 1 of parameter No. 6201).
(1) Type A: The deviation is calculated from the cutting time constant
and the servo time constant (loop gain).
Reference item
14.3.2
High--speed Skip
Signal
General
Acceleration /
Deceleration and Servo
Delay Compensation
(Type A/B)