FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
B–62764EN/01
4. INTERPOLATION FUNCTIONS
77
In a block specifying P1 to P4 after G31, the multistage skip function
stores coordinates in a custom macro variable when a skip signal (4–point
or 8–point ; 8–point when a high–speed skip signal is used) is turned on.
Parameters No. 6202 to No. 6205 can be used to select a 4–point or
8–point (when a high–speed skip signal is used) skip signal. One skip
signal can be set to match multiple Pn or Qn (n=1,2,3,4) as well as to
match a Pn or Qn on a one–to–one basis. Parameters DS1 to DS8 (No.
6206 #0A#7) can be used for dwell.
A skip signal from equipment such as a fixed–dimension size measuring
instrument can be used to skip programs being executed.
In plunge grinding, for example, a series of operations from rough
machining to spark–out can be performed automatically by applying a
skip signal each time rough machining, semi–fine machining,
fine–machining, or spark–out operation is completed.
Move command
G31 IP __ F __ P __ ;
G04 X (U, P)__ (Q__)
;
Dwell
IP_ : End point
F_ : Feedrate
P_ : P1–P4
X(U, P)_ : Dwell time
Q_ : Q1 – Q4
IP
IP
Multistage skip is caused by specifying P1, P2, P3, or P4 in a G31 block.
For an explanation of selecting (P1, P2, P3, or P4), refer to the manual
supplied by the machine tool builder.
Specifying Q1, Q2, Q3, or Q4 in G04 (dwell command) enables dwell
skip in a similar way to specifying G31. A skip may occur even if Q is
not specified. For an explanation of selecting (Q1, Q2, Q3, or Q4), refer
to the manual supplied by the machine tool builder.
Parameter Nos. 6202 to 6205 can be used to specify whether the 4–point
or 8–point skip signal is used (when a high–speed skip signal is used).
Specification is not limited to one–to–one correspondence. It is possible
to specify that one skip signal correspond to two or more Pn’s or Qn’s
(n=1, 2, 3, 4). Also, bits 0 (DS1) to 7 (DS8) of parameter No. 6206 can
be used to specify dwell.
CAUTION
Dwell is not skipped when Qn is not specified and
parameters DS1–DS8 (No. 6206#0–#7) are not set.
4.14
MULTISTAGE SKIP
(G31)
Format
Explanations
D Correspondence to skip
signals

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