HEIDENHAIN TNC 320 - Selecting tilting axes: M138

Multiple-Axis Machining | Miscellaneous functions for rotary axes
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HEIDENHAIN | TNC 320 | ISO Programming User's Manual | 10/2017
Selecting tilting axes: M138
Standard behavior
The control performs M128, and Tilt working plane only for those
axes that the machine tool builder has specified in the machine
parameters.
Behavior with M138
The control performs the above functions only in those tilting axes
that you have defined using M138.
Refer to your machine manual.
If you restrict the number of tilting axes with the M138
function, your machine may provide only limited tilting
possibilities. The machine tool builder will decide
whether the control takes the angles of deselected axes
into account or sets them to 0.
Effect
M138 becomes effective at the start of the block.
You can cancel M138 by reprogramming it without specifying any
axes.
Example
Perform the above-mentioned functions only in the tilting axis C.
N50 G00 Z+100 G40 M138 C*