HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 249)

233 HEIDENHAIN TNC 410, TNC 426, TNC 430
Position display in the tilted system
On activation of Cycle G80, the displayed positions (ACTL. and
NOML.) and the datum indicated in the additional status display are
referenced to the tilted coordinate system. The positions displayed
immediately after cycle definition may not be the same as the
coordinates of the last programmed position before Cycle G80.
Workspace monitoring
The TNC monitors only those axes in the tilted coordinate system
that are moved. If any of the software limit switches is traversed the
TNC will display an error message.
Positioning in a tilted coordinate system
With the miscellaneous function M130 you can move the tool,
while the coordinate system is tilted, to positions that are
referenced to the non-tilted coordinate system (see section ”7.3
Miscellaneous Functions for Coordinate Data”).
Combining coordinate transformation cycles
When combining coordinate transformation cycles, always make
sure the working plane is swiveled around the active datum. You
can program a datum shift before activating Cycle G80. In this case,
you are shifting the “machine-based coordinate system.”
If you program a datum shift after having activated Cycle G80, you
are shifting the “tilted coordinate system.”
Important: When resetting the cycles, use the reverse sequence
used for defining the them:
1. Activate datum shift
2. Activate tilting function
3. Activate rotation
...
Machining
...
1. Reset rotation
2. Reset tilting function
3. Reset datum shift
Automatic workpiece measurement in the tilted system
The cycle G55 enables you to have the TNC measure a workpiece
in a tilted system automatically. The TNC stores the measured data
in Q parameters for further processing (for example, for printout).
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