Siemens SINUMERIK 840D sl Function Manual page 1440

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W1: Tool offset

18.5 Tool radius compensation 2D (TRC)

If no intersection is possible between the last TRC block and a preceding block, the offset

curve of this block is extended with a circle whose center point lies at the end point of the

uncorrected block and whose radius is equal to the tool radius.

Figure 18-36 Retraction behavior with G461

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.

If no intersection is found, the following alarm is output:

Alarm "10751 Collision danger"

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

Basic Functions

Sinumerik 828d Sinumerik 840de sl