Siemens SINUMERIK 840D sl, Function Manual

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Detailed Description
2.4 Tool radius compensation 2D (TRC)
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
93
G462
If no intersection is possible between the last TRC block and a preceding block, a straight
line is inserted, on retraction with
G462
(initial setting), at the end point of the last block with
tool radius compensation (the block is extended by its end tangent).
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Figure 2-41 Retraction behavior with
G462
The search for the intersection is then identical to the procedure for
G461
.
With
G462
, the corner generated by
N10
and
N20
in the sample program is not machined to
the full extent actually possible with the tool used. However, this behavior may be necessary
if the part contour (as distinct from the programmed contour), to the left of
N20
in the
example, is not permitted to be violated even with y values greater than 10 mm.
If
KONT
is active (travel round contour at start or end point), behavior will differ according to
whether the end point is in front of or behind the contour.
End point in front of contour
If the end point is located in front of the contour, the retraction behavior is the same as for
NORM
. This feature does not change, even if the last contour block with
G451
is extended
with a straight line or a circle. Additional circumnavigation strategies to avoid a contour
violation in the vicinity of the contour end point are therefore not required.