YASKAWA yasnac lx3 - Page 119

4.
When the depth of cut in the final cycle along 5.
the thread angle ( = D ) is not met with
(K - a), the difference between K and a is de-
ducted from D.
The depth of cut in first
cycle never becomes larger than D.
@
B
N,., D
K
.-.
a
--.-
B’
DIFFERENCE
EXAMPLE
Incaseof D =5. Omm, K =9.8 mm,
a (Fixed amount) = 0.2 mm
r
-D = fix 5.000 = 10.000mm
1
Difference = H D - (K - a)
= 10.000 - (9.800 - 0.200)
=0.400 > 0
Thus, the depth of cut in each cycle is
as follows.
Thread cutting hold (option)
When this option is used, depressing the
FEED HOLD during thread cutting causes
the tool to perform threading up immediately
and then return to start point A. When
parameter #6019D7
❑ 1, the tool stops at
position B where Rapid threading pull-out is
terminated. Then, the tool returns to point
A upon depression of CYCLE START .
THREADCUTTING CYCLE
PATH WITHOUT FIOLD
o
START
~-------
POINT
k_ l~zR
HOLD
i,,
‘\
=EED HOLD
If the thread cutting hold option is not
selected, depressing of the FEED HOLD
during thread cutting does not hold the
operation, which stops at point C where the
retracting operation is completed.
First cycle . “ “ “ “ “ “
5.000- 0.400
= 4.600 mm
Second cycle . . .
fix 5.000-0.400
(4) Tool nose radius compensation t is not
available for G 76.
= 6.671 mm
(5) G code of 01 group must be newly program-
Third cycle . . .
fix 5.000-0.400
med in the next block of G76 cycle.
= 8.260 mm
Fourth cycle ...
ax
5.000-0.400
EXAMPLE
= 9.600 mm
G76. . . ;
Fifth cycle . . . . . . .
9.600 + 0.200
(a)
GOO M30 ;
= 9.800 mm
111