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

PROGRAMMING
B–62754EN/01
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
161
This function permits cutting a fixed pattern repeatedly, with a pattern
being displaced bit by bit. By this cutting cycle, it is possible to efficiently
cut work whose rough shape has already been made by a rough
machining, forging or casting method, etc.
w
A’
u/2
i+u/2
B
(R)
A
D
k+w
C
w
u/2
i : Distance and direction of relief in the X axis direction (Radius designation).
This designation is modal and is not changed until the other value is designated.
Also this value can be specified by the parameter No. 5135, and the parameter
is changed by the program command.
k : Distance and direction of relief in the Z axis direction.
This designation is modal and is not changed until the other value is designated.
Also this value can be specified by the parameter No. 5136, and the parameter
is changed by the program command.
d : The number of division
This value is the same as the repetitive count for rough cutting. This designation
is modal and is not changed until the other value is designated. Also, this value
can be specified by the parameter No. 5137, 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.
nu : Distance and direction of finishing allowance in X direction (diameter/radius
designation)
nw : Distance and direction of finishing allowance in Z direction
f,s,t : Any F, S, and T function contained in the blocks between sequence number “ns”
and “nf” are ignored, and the F, S, and T functions in this G73 block are effective.
The pattern commanded in the program should be as follows.
AA’B
G73 U (
ni) W (nk) R (d) ;
G73 P (ns)
Q (nf) U (nu) W (nw) F (f ) S (s ) T (t)
N (ns)⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
F____
S____
T____
N (nf)⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
The move command between A and B is
specified in the blocks from sequence
number ns to nf.
Fig. 14.2.3 (a) Cutting path in Pattern Repeating
14.2.3
Pattern Repeating
(G73)

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