YASKAWA yasnac lx3 - Page 57

(d)
@ GOO T-0404 ;
@
GO1 G44 F.. . ;
@ G03 X.. . Z.. . 1.. F.. ! ;
m
G44
Note that the
normal to the
I
CENTER
tool center is offset onto the
start point of the block imme-
diately after G41 (or G 42 through G44) or
T code, for each of above examples (a)
through (b) .
If G41 (or G42 through G44)
block or the block following T code has no
move command, one block ahead is read and
the compensation start operation is performed
on that block.
With no move command speci-
fied, up to two blocks may be programmed
consecutively.
However, if three or more
blocks have no move command, an error is
caused.
(6) Movement in compensation mode
When the tool nose radius compensation mode
is entered by G 41 (or G 42 through G44) com-
mand, the tool center keeps moving along
the path which has been offset by the tool
nose radius by the program command, until
the mode is cancelled by G40 or T •l 000
command.
The path is automatically calcu-
lated by the control.
So, only the cut con-
tour may be specified in the part program.
However, the following should be considered
for the inter-block movements and special
contours:
a.
Inter-block movement
(i)
For an inside corner (tangent-line angle
is less than 180°) , the intersection point
is computed and is passed.
(Intersection
point computing formula.
v
(ii)
b,
For an outside corner (tangent-line angle
is more than 180°) , the movement is con-
trolled.by the following M-code commands:
M96 ...
Tool radius compensation
circular path ON
M97 ...
Tool radius compensation
circular path OFF
(execution of intersection
calculation)
/
\
m
\/\\
‘.,
\
.
M96: Circular Path Mode
M97: Intersection Computing Mode
Movement of circular path is included in
the previous block.
Normally, M96 is used for this operation
However, when there is a possibility of
an “overcut” in cutting special shapes
with the M96, M97 should be used.
Movement in GOO mode
The instruction G 00 positions tools independ-
ently alc,ng each axis toward the final offset
position,. Care should be taken on the cutter
path so that tool does not contact the work.
TOOL MC VEMENT
GOO OR
G 01
PROGRAMMED
COMMAND
Fig. 2.32
PASSING INTERSECTION
POINT
49