YASKAWA yasnac i80m

2.13
PROGRAM
SUPPORT FUNCTIONS
(Cont’d)
(6)
Method
of
commanding
reverse
tap
(G74)
and
tap
(G84)
&
(a)
In
a
tap
cycle,
dwell
can
be commanded
at
R-point
return
and
initial
point
return
independent
of
hole
bottom
dwell.
Tap
elongation
or
contraction
can
be
offset
by
this
command.
(b)
Although
G74
and
G84
are
defined
as
reverse
tap
and
tap,
there is
no
difference.
That
is
to
say,
if
entered
with
M03,
M04
is
output
at
the
hole
bottom;
if
entered
with
M04,
M03
is
output
at
the
hole
bottom.
If
G84
is
commanded
without
rotating
the
spindle,
M04
is
output
at
the
bottom
of
the
hole.
If
G74
is
commanded,
M03
is
output.
•
Reverse
tap
(G74)
command
C7-I
X_
.Y
_
Z_
K_
L.
H_ E_
0_
W_
;
Q
i.Y.
Yl
—
INITIAL
POINT
W-POINT
SPINDLE
REVERSE
ROTATION
AFTER
R-POINT
DWELL
Q
R
POINT
I
!
E
FEED
F
FEED
2-POINT
v
•
DWELL
Fig.2.13.11
Reverse
Tap
(G74)
Command.
•
Tap
(G84)
command
0s4
X_
Y_
R
\’_
I._
!ÿ'_
E_
W.
W_
;
Q
iX. Yl
INITIAL
POINT
W-POINT
SPINDLE
FORWARD
ROTATION
AFTER
R-POINT
DWELL
Q
4
R
POINT
J
l
F.
FEED
F
FEED
Z-POINT
V
•
DWELL
p
°
S,NCLE-BLOCK
stoi-
Fig.
2.13.
12
Tap
(G84)
Command
-
188
-