HEIDENHAIN TNC 410 ISO Programming - Manual (Page 205)

HEIDENHAIN TNC 410, TNC 426, TNC 430 179
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Working with the secondary axes U/V/W
The TNC performs infeed movements in the axis that was defined in
the TOOL CALL block as the spindle axis. It performs movements in
the working plane only in the principal axes X, Y or Z. Exceptions:
n You program secondary axes for the side lengths in cycles G74
SLOT MILLING and G75/G76 POCKET MILLING.
n You program secondary axes in the contour geometry subprogram
of an SL cycle.