Supplementary Conditions - Siemens SINUMERIK 840D sl Function Manual

W1: Tool offset
2.5 2D tool radius compensation
Meaning
CDON:
CDOF:
CDOF2:
2.5.8.4

Supplementary conditions

Program test
To avoid program stops, the tool with the largest radius from the range of used tools should
always be used during the program test.
"Bottleneck detection" due to overhangs at outside corners
When the intersections of non-consecutive blocks are checked, not the programmed original
contours are examined, but the associated calculated equidistant paths. This can result in a
"bottleneck" being falsely detected at outside corners. The reason for this is that the calculated
tool path does not run equidistant to the programmed original contour when DISC > 0.
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Activating collision detection ("bottleneck detection")
CDON performs a check over an adjustable (MD20240 (Page 77)) number of blocks as to
whether the tool paths of non-adjacent blocks intersect. This look-ahead function allows
possible collisions to be detected in advance and permits the control to actively avoid them.
Deactivating collision detection ("bottleneck detection")
With CDOF, a search is made in the previous traversing block (at inside corners) for a
common intersection for the current block; if necessary the search is extended to even
earlier blocks. If an intersection is found, no further blocks are examined. With outside
corners, an intersection is always found between two consecutive blocks.
Note:
CDOF can be used to avoid the faulty detection of bottlenecks which may occur due to a
lack of information in the NC program, for example.
Deactivating collision detection for 3D circumferential milling
The tool offset direction is determined from adjacent block parts with CDOF2. CDOF2 is
only effective for 3D circumferential milling and has the same meaning as CDOF for all
other types of machining (e.g. 3D face milling).
Function Manual, 06/2019, A5E47435126B AA
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