HEIDENHAIN TNC 640 User Manual page 707

Turning | Turning program functions (option 50)
M128
Alternately, you can use the M128 function for simultaneous
turning
The following constraints apply for M128:
Only for NC programs programmed on the path of the tool
center.
Only for button turning tools with TO 9
The tool must be measured at the center of the tool-tip radius
Using a facing slide
Application
Refer to your machine manual.
This feature must be enabled and adapted by the
machine tool builder.
With a facing slide, also called boring head, you can perform almost
all turning operations with fewer different tools. The slide position
of the facing slide in the X direction can be programmed. On the
facing slide you mount, for example, a longitudinal turning tool that
you call with a TOOL CALL block.
Machining also works with a tilted working plane and on
workpieces that are not rotationally symmetric.
Please note while programming
The following constraints apply to the use of a facing slide:
Miscellaneous functions M91 and M92 cannot be used
Retraction with M140 is not possible
TCPM or M128 are not possible
DCM collision monitoring cannot be used
Cycles 800, 801 and 880 cannot be used
If you are using the facing slide in the tilted working plane, please
note the following:
The control calculates the tilted working plane as in milling
mode. The COORD ROT and TABLE ROT functions, as well as
SEQ refer to the XY plane.
HEIDENHAIN recommends using the TURN positioning
behavior. The MOVE positioning behavior is not the best option
in combination with the facing slide.
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
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