HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 469)

Turning program functions (Option #50) 14.5
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
469
14.5 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 complete
recessing and undercutting as complete contour elements with a
single NC block.
Recessing and undercutting always reference a
previously defined linear contour element.
Recessing elements GRV and undercut elements
UDC can only be used in contour subprograms that
are called by a turning cycle (see User's Manual,
Cycles, Turning).
You have various input possibilities when defining recessing and
undercutting. Some of these inputs are mandatory, and others
you can leave out (optional). The mandatory inputs are symbolized
as such in the help graphics. In some elements you can select
between two different definitions. The TNC has soft keys with the
corresponding selection possibilities.
Programming recessing and undercutting:
Show the soft-key row with special functions
Select the menu for TURNING PROGRAM
FUNCTIONS
Select
RECESS/ UNDERCUT
Select GRV (recess) or UDC (undercut)