Siemens SINUMERIK 828D Function Manual page 1486

W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
With CDOF, the search for an intersection initially examines two consecutive blocks. Other blocks are not included
in the search. If an intersection is found between adjacent blocks, no further blocks are examined. With outside
corners, an intersection can always be found between two consecutive blocks.
Predictive examination of more than two adjacent blocks is thus possible with CDON and CDOF.
Note
CDOF2 is only effective for 3D peripheral milling and has the same significance as CDOF for
all other types of machining (e.g. 3D face milling).
Omission of block
If an intersection is detected between two blocks, which are not consecutive, none of the motions programmed
between these blocks on the compensation plane are executed. All other motions and executable instructions (M
commands, traversal of positioning axes, etc.) contained in the omitted blocks are executed at the intersection
position in the sequence, in which they are programmed in the NC program.
Warning 10763
If a block has been omitted as a result of the collision or bottleneck detection functions, warning 10763 is output.
The program is not interrupted.
This warning is suppressed if bit 1 is enabled in machine data:
MD11410 $MN_SUPPRES_ALARM_MASK (Mask for suppressing special alarm outputs).
Special points to be noted
When the intersections of non-consecutive blocks are checked, it is not the programmed original contours that
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.
1486
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions