2.8.2.5.4 Pattern Repeating (G 73)
This cycle is useful for cutting the workpiece
such as moldings and forgings whose cutting
shapes are roughly made beforehand.
(1) Command
G73
Nns . . . . . . ;
. . . . . .
-x
l--
—
1
—
W*. .. If. . .
K+. ..
D.. .
F(E) ... s... ;
—— —
I
I
I
Note
L Number of cuttings
(1 S D S 127, without signs)
L Rough finishingallowance
in Z–axisdirection
I
L Finishingallowancein X direction
(Radius designation)
– Finishing allowance in Z-axis direction
– Finishing allowancein X -axis direction
(Diamet& designation)
Finishingshape pro~ram (45 blocks maximum)
Tool pat;: A- ‘“A’-+ B (See Fig.
Sequence number should startwith ns and end with nf.
F and S commands are effectiveonly when
G70 finishingcycleis executed.
Feed command (F(E)) and spindlespeed command(S) are
given for
executing closed loop cutting
Note:
(Retractlnal
t--i c
cycle.
K
(2)
Rules in programming G73
I
I
I
r
B
?
THRUST
MOTION
FINISHING
u
ALLOWANCE
( -1
2
a.
b.
t#&
72
I
— Flnlshlng shape program
Pattern repeating cycle
——-
Slart anc f]nsk
at posltlon A
c.
Fig. 2.48
d.
Address U , W, I and K must be program-
med with signs.
Address D for number of cuttings must be
programmed without signs, obeying the fol-
lowing restriction.
D command out of the above range causes
data error. (Alarm code “ 096”)
When D is 1, the cutting of I and K values
is completed in a single cycle remaining
finishing allowance.
Finishing shape should be programmed im-
mediately after the block containing G73.
The start (Nns) and end (Nnf) block of a
finishing shape cycle must be programmed
with GOO or GO1.
But these 2 blocks need not be parallel with
X or Z axis.
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