Siemens SINUMERIK 828D Programming Manual page 326

Tool radius compensation
10.5 Collision monitoring (CDON, CDOF, CDOF2)
Note
The number of NC blocks that are included in the collision detection, can be set via machine
data.
Example
Milling on the center point path with standard tool
The NC program describes the center point path of a standard tool. The contour for a tool
that is actually used results in undersize, which is shown unrealistically large to demonstrate
the geometric relationships in the following figure. The control also only has an overview of
three blocks in the example.
Figure 10-5
Since an intersection exists only between the offset curves of the two blocks N10 and N40,
the two blocks N20 and N30 would have to be omitted. In the example, the control does not
know in block N40 if N10 has to be completely processed. Only a single block can therefore
be omitted.
With active
In this situation, an active
326
Compensation motion for missing intersection
, the compensation motion shown in the figure is executed and not stopped.
CDOF2
or
CDOF CDON
would result in an alarm.
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals