YASKAWA yasnac i80m

2.12
TOOL
OFFSET
(Cont’d)
(5)
Commands
involving
no
movement
in
offset
mode
(a)
During
tool
radius
compensation,
the
NC
equipment
normally
calculates
the
tool
path
by
prereading
data
for
two
blocks
ahead.
If
a
block
without
coordinate
command,
e.g.,
G04
(dwell),
is included
in
these
preread
blocks,
calculation
is
made
by prereading
one
block
further
ahead.
Such
non-coordinate-commanded
blocks
can
be
processed
for
up
to
two
consecutive blocks.
If
there is
no
coordinate
command
in
three
or
more
blocks,
calculations
are
made
for
tool
radius
to
obtain
the
correct
path.
Therefore,
when
commanding
G4KG42),
care
must
be
taken
in
the
subsequent
shape-indicating
programs
so
that
move
commands
in
the
offset
plane
are
not
dis¬
continued
in
three
or
more
blocks.
•Q
Example
of
Programming
GI7
G01
C41
X
......
V
......
D
F
;
X
Y
:
:
X
Y
:
G04
PI
000
:
Block
involving
no
movement
in
offset
plane
(If
the
number
of
such
a
block
is
less
than
three,
commands
may
be
smoothly
connected.
)
X Y
:
:
X-
•Y
:
Z
Z
X
......
Y
:
X
Y
:
G40
X
Y-
-
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