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

PROGRAMMING
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
B–62754EN/01
156
This option canned cycles to make CNC programming easy. For instance,
the data of the finish work shape describes the tool path for rough
machining. And also, a canned cycles for the thread cutting is available.
There are two types of stock removals in turning : Type I and II.
If a finished shape of A to A’ to B is given by a program as in the figure
below, the specified area is removed by d (depth of cut), with finishing
allowance u/2 and w left.
B
(F)
(R)
e
A
C
d
A’
45,
(R)
(F)
u/2
w
N (ns)⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
F____
S____
T____
N (nf)⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅;
d : Depth of cut (radius designation)
Designate without sign. The cutting direction depends on the direction AA’. This
designation is modal and is not changed until the other value is designated. Also
this value can be specified by the parameter (No. 5132), and the parameter is
changed by the program command.
e : Escaping amount
This designation is modal and is not changed until the other value is designated.
Also this value can be specified by the parameter (No. 5133), and the parameter
is changed by the program command.
ns : Sequence number of the first block for the program of finishing shape.
nf : Sequence number of the last block for the program of finishing shape.
u : Distance and direction of finishing allowance in X direction (diameter / radius
designation).
w : Distance and direction of finishing allowance in Z direction.
f,s,t : Any F , S, or T function contained in blocks ns to nf in the cycle is ignored, and the
F, S, or T function in this G71 block is effective.
G71 U (d) R (e) ;
G71 P (ns)
Q (nf) U (u) W (w) F (f ) S (s ) T (t)
Program command
(F) : Cutting feed
(R) : Rapid traverse
The move command between A and B is
specified in the blocks from sequence
number ns to nf.
Fig. 14.2.1 (a) Cutting Path in Stock Removal in Turning (Type I)
14.2
MULTIPLE
REPETITIVE CYCLE
(G70–G76)
14.2.1
Stock Removal in
Turning (G71)
D Type I

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