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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
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