HEIDENHAIN TNC 620 (73498x-02) ISO programming - Manual (Page 366)

Programming: Multiple Axis Machining
12.4 Miscellaneous functions for rotary axes
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TNC 620 | User's Manual for DIN/ISO Programming | 5/2013
Inclined machining with noncontrolled rotary axes
If you have noncontrolled rotary axes (counting axes) on your
machine, then in combination with M128 you can also perform
inclined machining operations with these axes.
1 Manually traverse the rotary axes to the desired positions.
M128 must not be active!
2 Activate M128: The TNC reads the actual values of all rotary
axes present, calculates from this the new position of the tool
center point, and updates the position display
3 The TNC performs the necessary compensating movement in
the next positioning block
4 Carry out the machining operation
5 At the end of program, reset M128 with M129, and return the
rotary axes to the initial positions
Proceed as follows:
As long as M128 is active, the TNC monitors the
actual positions of the noncontrolled rotary axes.
If the actual position deviates from the nominal
position by a value greater than that defined by the
machine manufacturer, the TNC outputs an error
message and interrupts program run.