Supplement:
(i) The use of the finishing shape program fea-
ture increases the cycle time as follows:
, Example of finishing shape program search
time:
When the machining tape is 5 m ( 2000 char-
cters) long and the finishing shape pro-
gram is stored in the middle of the tape,
the cycle time is about 100 msec.
. Example of the execution time for storing
the searched finishing shape program in
internal memory:
When the size of the finishing shape pro-
gram is 30 blocks,
the execution time is
about 1 sec. However, the storing of the
(ii) This search feature is executed only in the
part program having the program number
for which G70 is specified.
Notes :
1.
For the sequence number ns for cycle start
and nf for cycle finish, the following case
causes input error.
When the sequence numbers ns and nf
of G70 are not commanded in the finish-
ing shape program (Tape operation)
When the sequence number ns of G70 is
commanded in advance of sequence num-
ber ns, or ns = nf.
searched program in internal memory is
2.
When the program has entered the tool nose
performed in the block which precedes
the block of G70 command. Hence, the
radius compensation mode before G 70 is com–
cycle time is increased by the amount
manded, the compensation is effective for
G70.
obtained by subtracting the execution
time of the preceding block from the
above time (about 1 see) .
2.8.25.6 Peck Drilling in Z-axis (G74)
This command permits the operation of peck drill-
ing with pecking motion in parallel with Z axis.
(1) Command format
G74 X(U)*”””
z(w) f... 1.. . K.. . D.. .
F(E) . . .
(Rl) ;
~~~~~ N~tel
1
$eedrate
Retracting amount of the tool at
cutting bottom (without signs)
Depth of cut in Z–axis direction (without
Move amount in X-axis direction (without signs)
Z coordinate of position C
X coordinate of position B
R Rap]d traverse
-x
F Specified by F code
~.
i
Retracilong amount
(Sett!ng t6204)
“m:
the
signs)
The cycle starts and finishes at position A.
The fixed amount of pecking is set by the
parameter No. ’74.
Note 1:
The above diagram is of the cause
where
“R1” is not specified. When “R1” is
specified, the retracting amount ( 6 ) for
each approach is ignored and the tool re-
turns to the approach start point, namely
point A in Z-axis.
This cycle starts at point A and ends at it.
+------z
Fig. 2.49
107
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