YASKAWA yasnac lx3 - Page 114

2.8.25.5 Finishing Cycle (G 70)
After rough cutting of G71, G72 and G73, the
finishing cutting can be made by the commands
followin~ Gi’0. -
(1) G70 Pns Qnf ;
L
T
nf:
ns:
Sequence number for
cycle finish
Sequence number for
cycle start
This command permits the execution of the
finishing shape program in G’71, G72 or
Gi’3 which is commanded previously.
F(E) and S functions specified in the finish-
ing shape program are effective in the finish-
ing cycle.
F(E) and S functions for rough cutting spec-
ified in the block containing G71, G72 or G73
are ignored in the finishing cycle.
Note :
The internal memory for storing the
finishing shape program:
To shorten the stock removal cycle time, the
finishing shape program is binary-converted
and then is stored in the memory (one)
pair) in the unit.
This memory is called the
internaf memory for finishing shape program.
(2) G70 does not need to be commanded imme-
diately after the block of G71, G72 or G73.
Necessary information such as tool change
from a rough cutting cutter to a finishing
cutter can be inserted between them.
However,
the following command and opera-
tion should not be programmed between them .
Inhibited Command
]
Result
and Ooeration
(3) Storage and search of the finishing shape
program
The processing of the finishing shape pro-
gram is different in tape operation
mode and memory operation mode.
a,
Operation in Tape Mode
G71 Pns Qnf. . ;—
‘:s-
‘L
I
Nnf. ..
;J
G70 Pns Qnf. . . ;—
“G72 Pns’ Qnf ’. . . ;—
Nns’ . . . ;
L
Nnf’ ... ;
. J
b.
Stock removal
in turning
Finishing shape
program (A)
(25 blocks
maximum)
Execution of
finishing cycle
Stock removal
in facing
Finishing shape
program (B)
(25 blocks
maximum )
After executing the above program the pro-
gram (A) is eliminated and the program (B)
is retained in the finishing shape memory.
Therefore, the finishing command with G 70
in the trailingprogram is effective for the
finishing shape program (B) .
If the sequence number specified by G 70
does not match the sequence number in the
memory for finishing shape program , an
error (“091” ) is caused.
Operation in memory (MEM) mode
When the sequence number specified by G 70
matches the sequence number in the memory
of finishing shape program, the finishing
cycle is normdl y executed. If they do not
match, a search for the specified finishing
shape program from the part programs is
performed.
Then, the program is stored in
the memory and is executed. This is called
the finishing shape program search feature.
This feature enables , only in memory mode,
the programming in which the stock removal
cycle (or closed loop cutting cycle) is per–
formed two or more times as shown below
and then the finishing cycle is performed
for each stock removal cycle :
Stock removal cycle (A)
+
Stock removal cycle (B)
Finishing *cycle (A)
4
Finishing cycle ( B )