Example - Siemens SINUMERIK 840D sl Function Manual

2.5.8.5

Example

Effect of collision detection using an example
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:
MD20240 $MC_CUTCOM_MAXNUM_CHECK_BLOCKS = 3
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 CDOF2, the compensation motion shown in the figure is executed and not stopped.
In this situation, an active CDOF or CDON would result in an alarm.
Tools
Function Manual, 06/2019, A5E47435126B AA
W1: Tool offset
2.5 2D tool radius compensation
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