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In this
case,
insert
a
linear
dummy
block
to
specify
the tangential
direction
at
the
start point
of the commanded
circular
arc as shown
in
Fig. 2.12.40.
Pay
attention
to
the
sign
of
dummy
block data
depending
on
the
shape
of
circular
arc.
The
tool is stopped
at
point
A
by
the dummy block,
to
be
prepared
for the
next
circular
command.
\
X
VA
CENTER
l
/
V
/
\
V
\
\
t
Y
N"51 DUMMY BLOCK
X
Fig. 2.12.41
Stop at point
A by Dummy Block
If
an
1-. J-.
or K
-based
duniniy
block i.s commanded
along with a move
cuinmand
in
the
dl'sel
mode. I.
.1.
nr
K
are disregarded.
However,
if
I.
J.
or
K
is
commanded when offset
is
canceled,
the offset position is corrected from
point 1
to
point
2 by direction specifica¬
tion
by I or
J.
I. .1
DIRECTION
V
\
r/
55
G 40
VV
\
GJE
Fig.
2.12.42
Correction of Offset Position
141
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