1428 HEIDENHAIN Technical Manual iTNC 530 HSCI
The following limitations and conditions must also be considered for
reliable operation and correct application of DCM:
DCM helps to minimize the danger of collision. However, certain
constellations cannot be considered during operation. Please pay
attention to the following information.
DCM can only protect machine components from collision if they have
been dimensioned correctly, and if their positions in the machine
coordinate system have been entered correctly.
Once DCM has been configured, all possible collisions must be tested in
the Manual operating mode in order to detect faulty configurations.
Collisions of defined machine components or the tool with the workpiece
are not detected.
Please note that collision monitoring does not take any filters into
account when calculating the path (e.g. nominal position value filters or
angle tolerances for rotary axes in Cycle 32). The path deviation resulting
from the nominal position value filters can be ignored. However, the
machine manufacturer must calculate and define in MP1292 the
deviations of the collision objects (CMOs) from the nominal path resulting
from the angle tolerances for rotary axes (Cycle 32).
DCM does not work in combination with the "Free Rotation" PLC function
(page 8 – 1152), since this special function for the defined "free" rotary
axis runs asynchronously to the system. For the work envelope this
means that all CMOs moved with the "free" rotary axis cannot be
monitored by DCM.
In the cycles for "Tapping without Floating Tap Holder," you must note
that DCM does not take into consideration the simple "tracking of the tool
axis." In order to use DCM for these cycles, bit 4 of MP7160 must be set
to 1 (activates the exact interpolation of the tool axis with the spindle).
If a machine is operated in lag mode or in semi-feedforward mode, then
it is assumed that the machine manufacturer takes the greatest possible
path deviation into account and increases the size of the collision objects
accordingly.
Even if there are CMOs in the kinematics tables, there is no protection
against collisions without software option 40 (DCM).
When a tool is exchanged, the new tool data will not become effective
until the strobe has been acknowledged by the PLC.
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