
13. FUNCTIONS TO SIMPLIFY
PROGRAMMING
B–64112EN/01
NC FUNCTION
130
This function permits cutting a fixed cutting pattern repeatedly with the
position being displaced bit by bit. By this cutting cycle, it is possible to
efficiently cut the work whose rough shape has already been made by
rough machining, forging, or casting, etc.
∆w
A’
∆u/2
B
(R)
A
D
∆k+∆w
C
∆w
∆u/2
R : Rapid traverse
F : Cutting feed
Pattern to be specified by the program
Point A→ Point A’→ Point B
G73 U(∆i) W(∆k) R(d) ;
G73 P(ns)
Q(nf) U(∆u) W(∆w) F(f) S(s) T(t) ;
N(ns) . . . . .
. . . . . . . . . . .
F_. . . . . . .
S_. . . . . . .
T_. . . . . . .
N(nf) ;. . . . . .
The move commands for the target figure from A
to A’ then to B are specified by blocks between
sequence numbers ns and nf.
∆i : Distance and direction of the clearance along X axis
(radius programming)
∆k : Distance and direction of the clearance along Z axis
d : Number of divisions which is equal to the number of times
that rough cutting is performed
ns : Sequence number of the first block of target figure blocks
nf : Sequence number of the end block of target figure blocks
∆u : Distance and direction of the finishing allowance along X
axis (diameter or radius programming)
∆w : Distance and direction of the finishing allowance along Z
axis
f, s, t : F, S, and T codes
CAUTION
F, S, and T specified by any block between ns and nf are
ignored. Those specified by the block of G73 or before are
effective.
This function is available for only memory mode.
13.5.3
Pattern Repeating
(G73)
Format