Siemens SINUMERIK 840D sl Function Manual page 87
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The control attempts to cut this circle with one of the preceding blocks. If CDOF is active, the
search is terminated when an intersection is found, i.e. the system does not check for more
intersections with even earlier blocks.
If CDON is active, the search for more intersections continues after the first intersection is found.
An intersection point, which is found in this way, is the new end point of a preceding block and
the start point of the deactivation block. The inserted circle is used exclusively to calculate the
intersection and does not produce a traversing movement.
Note
If no intersection is found, the following alarm is output:
Alarm "10751 Collision danger"
G462
If no intersection is possible between the last TRC block and a preceding block, a straight line
is inserted, on retraction with G462 (basic setting), at the end point of the last block with tool
radius compensation (the block is extended by its end tangent).
Figure 2-27
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.
Tools
Function Manual, 06/2019, A5E47435126B AA
Retraction behavior with G462
W1: Tool offset
2.5 2D tool radius compensation
87
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