HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 341)

Miscellaneous functions for path behavior 10.4
10
TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
341
Virtual tool axis VT
Your machine tool builder must have prepared the
TNC for this function. Refer to your machine manual.
With the virtual tool axis you can also traverse in the direction
of a sloping tool with the handwheel with machines with swivel
heads. To traverse in a virtual tool axis direction select the VT axis
on the display of your handwheel, See "Traverse with electronic
handwheels", page 458. With an HR 5xx handwheel you can
select the virtual axis directly with the orange VI axis key if required
(refer to your machine manual).
You can also carry out handwheel superimpositioning in the
currently active tool axis direction with the M118 function. For
this purpose, you must at least define the spindle axis with the
permitted traverse range (e.g. M118 Z5) in the M118 function and
select the VT axis on the handwheel.