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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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138
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