YASKAWA YASNAC 3000G

When
G29
is
programmed,
it
is
not
necessary
to
consider
the distance
between
point
B
and
C
in
the
program.
Particularly
when
an
incremental
in¬
struction
is
used,
this is
effective
for
returning
tool
to
the
original
position,
after
returning
to
reference
zero.
Movement
of C
-*
B
and
of
B
-*ÿ
D
is
made
at
rap¬
id
traverse
rate
simultaneously
along
three
axes
{simultaneously
four
axesÿ)
by
G29.
However,
in
an
axis
for
which
a
coordinate
instruction
was
omitted,
the
tool
will
not
move.
If
G28
is
programmed
a
number
of
times,
the
fi¬
nal
coordinates
of
point
B
which
last
G28
creates
is
effective
for
the
move
of
G29.
•
After
positioning
to
intermediate
positioning
point
B,
direct
positioning
to
reference
zero
is
made
by
rapid
traverse.
Return
to
reference
zero
is
faster
than
with
the
normal
"automatic
return
to
reference
zero"
using
the
decelera¬
tion
limit
switches
of
each axis.
•
Rapid
return to
reference
zero
is
possible
even
when
point
B
is
outside
the
region
in
which
re¬
turn to
reference
zero
is
possible.
.
However,
rapid
return to
reference
zero
is
possible
only
after
normal
return
to
reference
zero
has been
completed
with
all the
axes
by
manual
return
to
reference
zero
or
by
a
G28
command
after
power
switching
on.
Rapid
return
to
reference
zero
is
possible
only
with
a
G28
command,
and
it
does
not
affect
manual
return to
reference
zero.
•
Where
the
control is
provided
with
the
fourth
axis,
rapid
return
to
reference
zero
is
made
if
normal
return
to
reference
zero
of
X,
Y
and
Z
axes
has
already
been
completed,
unless
the
fourth
axis is
designated
in
the
G28
command.
If
the
fourth
axis is
programmed,
normal
re¬
turn to
reference
zero
is
executed
unless
nor¬
mal
return
to
reference
zero
in
all
four
axes
has
been
completed.
EXAMPLE
1
(In
the
case
of
absolute
input)
Intermediate
coordinates
X
Y
(0,
2000,
1000)
(3000,
2000,
1000)
N21
G90
*
Z
N22
G28
Z1000
Y2000
*
N23
G28
X3000
*
N24
G29
X-4000
Y-5000
*
GOO
X3000
Y
2000
*
Equal
to
the
two
blocks
GOO
X-4000
Y-5000
*
2.14.12
RETURN
FROM
REFERENCE
ZERO
(G29)+
EXAMPLE
2
This code
is
used
to
return
the
tool
to
its
original
position
after
return
to
reference
zero
by
auto¬
matic
return to
reference
zero,
along
the
same
path.
N31
G91
*
N32
G28
Z-
•
-
*
N33
G28
X2000
Y4000
*
Point
A
-*•
B
-»
C
(Reference
zero
point)
G28
Y
•
•
Z
•
*
N34
M06
*
Point
B
N35.
G29
X4000
Y-4000
*
G29
Y-
•
•
Z-
• •
*
Point
C
-*•
B
-*•
D
Point
D
l
c
(REFERENCE
ZERO)
(REFERENCE
ZERO
POINT)
B
+Y
7\
RETURN
TO
REFERENCE
ZERO
j
/
o
N
B
/
\
\
\JL
/
INTERMEDIATE
POSITIONING
POINT
/
Do"
+X
A
6
A
40
20
Fig.
2.
14.
12.
2
Fig.
2.14.12.1
-
37
-