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HEIDENHAIN TNC 640 (34059x-04) ISO programming User Manual

Page 352

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Programming: Special functions

11.2 Dynamic Collision Monitoring (software option)

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352

TNC 640 | User's Manual for DIN/ISO Programming | 3/2014

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.

The TNC cannot implement collision monitoring if

with an axis-direction key or the handwheel you carry

out a movement over several axes simultaneously.

For example such a movement with several axes is

implemented as follows:

In the tilted working plane on a machine with

swivel head (sloping tool).
With active TCPM

This monitoring is first supported with software

34059x-03.