FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
B–62754EN/01
160
As shown in the figure below, this cycle is the same as G71 except that
cutting is made by a operation parallel to X axis.
A’
u/2
d
B
(F)
(R)
e
45°
(R)
(F)
A
C
w
G72 W(d) R(e) ;
G72 P(ns)
Q(nf) U(u) W(w) F(f) S(s) T(t) ;
The meanings of d, e, ns, nf, u,w, f, s, and t are the same as
those in G71.
Tool path
Program command
Fig. 14.2.2 (a) Cutting Path in Stock Removal in Facing
The following four cutting patterns are considered. All of these cutting
cycles are made parallel to X axis and the sign of u and w are as follows
:
B
A
A’
U(+)W(–)
A
A
A
A’
+X
+Z
U(+)W(+)
U(–)W(–)
U(–)W(+)
A’
A’
B
BB
Both linear and circular
interpolation are possible
Fig. 14.2.2 (b)
Signs of Numbers Specified with U and W in Stock Removal in Facing
The tool path between A and A’ is specified in the block with sequence
number “ns” including G00 or G01, and in this block, a move command
in the X axis cannot be specified. The tool path between A’ and B must
be steadily increasing and decreasing pattern in both X and Z axes.
Whether the cutting along AA’ is G00 or G01 mode is determined by the
command between A and A’, as described in item 14.2.1.
14.2.2
Stock Removal In
Facing (G72)
D Signs of specified
numbers

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