YASKAWA YASNAC 3000G - Page 53

However,
it
is
possible
to
change
the
tool
ra¬
dius
value
,
by
changing
the
contents
of
the
offset
memory
of
the
initially
designated
D
code.
The
changing
is
made
by
MDI.
/
The
change
becomes
operative
from
the
block
read
ahead
into
the
buffer
register
after
mak¬
ing
the
change.
G41
\
/
\
v
N20
N22
o
I
BLOCK
READ
AFTER
CHANGE
OF
TOOL
RADIUS
VALUE
G42
(a)
G41
+
G42
(M96
mode)
/
AX
N21
G41
N20
(
N22
G42
Fig.
2.
14.
13.
12
(b)
G42
+
G4i
-
Method
of
cancellation
of
compensation
G40
is
the command
for
cancelling
tool
radi¬
us
compensation
and
for
positioning
or
feed¬
ing
the tool
to
just
programmed
end
point.
In
this
case,
the
tool
moves
to
a
point
on
the
normal line
at
the end
point
of
the
block
im¬
mediately
before
the
block
containing
G40.
Therefore,
no
portion
will
be
left
unmachined
even
when
a
cancellation
with
sharp
angle
is
programmed.
Because
G40
accompanies
can¬
celling
movement,
program
it
in
the
GOO
or
G01
mode like
G41,
G42.
An
input
error
occurs
if
group
A
other than
GOO,
G01
is
used.
Fig.
2.
14.13.
11
Note:
The
movement
idential
to
what is
shown above
is
also obtained when
block
N21
is
split
into
two
blocks
as
follows.
G42
(G41)
*
X-
• •
Y.
•
-
*
•
Change
of
tool radius
value
in
compensation
mode
New
D
code
cannot
be
effective
in
a
compen¬
sation
mode.
Compensation
is made
with
the
initially
programmed
D
code,
and
it
remains
effective
until
it
is cancelled
by
G40.
-
46
-