HEIDENHAIN TNC 640 - Page 697

Turning | Turning program functions (option 50)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
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16.5 Turning program functions (option 50)
Recessing and undercutting
Some cycles machine contours that you have written in a
subprogram. You program these contours with path functions or
FK functions. Further special contour elements are available to you
for writing turning contours. In this way you can program recessing
and undercutting as complete contour elements with a single NC
block.
Recessing and undercutting always reference a
previously defined linear contour element.
You can only use the recess and undercut elements
GRV and UDC in contour subprograms that have been
called by a turning cycle.
Further information: Cycle Programming User's
Manual
Various input options are available to you for defining undercuts
and recesses. Some of these inputs have to be made (mandatory
input), some can be skipped (optional input). The mandatory inputs
are symbolized as such in the help graphics. In some elements you
can select between two different definitions. The controls has soft
keys with the corresponding selection possibilities.
Programming recessing and undercutting:
Show the soft-key row with special functions
Press the TURNING PROGRAM FUNCTIONS soft
key
Press the RECESS/ UNDERCUT soft key
Press the GRV (recess) or UDC (undercut) soft
key