Datum Setting On Machines With Spindle-Head Changing Systems; Position Display In A Tilted System; Limitations On Working With The Tilting Function - HEIDENHAIN ITNC 530 - 6-2010 DIN-ISO PROGRAMMING User Manual

Datum setting on machines with spindle-head
changing systems
If your machine is equipped with a spindle head changer, you should
use the preset table to manage your datums. Datums saved in preset
tables account for the active machine kinematics (head geometry). If
you exchange heads, the TNC accounts for the new head dimensions
so that the active datum is retained.

Position display in a tilted system

The positions displayed in the status window (ACTL. and NOML.) are
referenced to the tilted coordinate system.

Limitations on working with the tilting function

The probing function for basic rotation is not available if you have
activated the working plane function in the Manual Operation mode.
The actual-position-capture function is not allowed if the tilted
working plane function is active.
PLC positioning (determined by the machine tool builder) is not
possible.
496 Manual Operation and Setup