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2.13
PROGRAM SUPPORT FUNCTIONS (Cont'd)
(5)
Method of
commanding boring
(G76)
and back
boring
(G77)
(a)
The direction of shift for G76 and G77 can
not
only
be commanded
by
[Q
command
+
angle (setting
PmS05)J. but
can also be
commanded
by the program.
(b)
The dwell time before shift can also be
commanded
by setting
Pm400
or by program.
G76 X
......
Y
......
Z
......
R
I
J
P
'-Dwell time
Specification of shift direction
L
•
Boring (G76)
command
i;
7*.
I<_
i._ i-_ P_
w_
:
(CANNED SHIFT)
i.. 7i.
X_
V.
/.
H_ I
.
I..
I
_
l'.
V\_
:
(VARIABLE SHIFT)
RETURN
TO INI
I
JAL.
W.
AND
R POINT
SPINDLE START AFTER
SHIFT
(\. V)
<
INITIAL POINT
T
:
c
W'-POINT
R POINT
T
c
f
SHIFT
SPINDLE DIVIDING
STOP AFTER DWELL
-
:
Z-POINT
OK il.
Ji
SHIFT
•
DWELL
o
SINGLE-BLOCK
STOP
O
If
address
Q
and address I
or
J
are
simultaneously
commanded,
address 1
or
J
is
disregarded.
0
For
the hole bottom
dwell, setting
Pm
400 is overridden by
program
command.
O
Setting
Pm 400
is only
valid
when bit
D3 of Pm 4017
is
ON.
O
The shift speed is
set
by
Pm 2864.
However,
if Pm 2864 = 0. F command
is fol¬
lowed.
0
Because
address Q
is modal, if there is
Q
command befoi-e 1
or
J
command, 1
or
J
is disregarded.
I
or
J
can
be made
valid
by commanding it
after
canceling
the
_
canned cycle with G80.
_
Fig.2.13.9 Boring (G76) Command
-
186
-
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