HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 338)

Programming: Special functions
11.2 Dynamic Collision Monitoring (software option)
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
Keep these constraints in mind:
DCM helps to reduce the danger of collision.
However, the TNC cannot consider all possible
constellations in operation.
Collisions of defined machine components and
the tool with the workpiece are not detected by
the TNC.
DCM can only protect those machine
components from collision that your machine
tool builder has correctly defined with regard to
dimensions, orientation and position.
The TNC can monitor the tool only if a
positive
tool radius has been defined in the tool table.
The TNC cannot monitor tools with a radius of 0
(as is often used in drilling tools) and therefore
issues an appropriate warning.
The TNC can only monitor tools for which you
have defined positive tool lengths .
When a touch probe cycle starts, the TNC no
longer monitors the stylus length and ball-tip
diameter so that you can also probe in collision
objects.
For certain tools (such as face milling cutters),
the diameter that would cause a collision can be
greater than the dimensions defined in the tool-
compensation data.
The handwheel superimpositioning function with
M118 in combination with collision monitoring
is only possible in stopped condition. To be able
to use
M118 without limitations, you have to
deselect DCM either by soft key in the Collision
Monitoring (DCM) menu, or activate a kinematics
model without collision monitored objects
(CMOs).
For tapping with a floating tap holder only the
basic setting of the floating tap holder is taken
into account.
The tool oversizes
DL and DR from the tool table
are taken into account by the TNC. Tool oversizes
in the
TOOL CALL are not taken into account.