HEIDENHAIN TNC 640 (34059x-05) - Manual (Page 244)

Programming: Programming contours
6.6 Path contours – FK free contour programming
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 1/2015
Initiating the FK dialog
If you press the gray FK button, the TNC displays the soft keys you
can use to initiate an FK dialog—see the following table. Press the
FK button a second time to deselect the soft keys.
If you initiate the FK dialog with one of these soft keys, the TNC
shows additional soft-key rows that you can use for entering known
coordinates, directional data and data regarding the course of the
contour.
Soft key FK element
Straight line with tangential connection
Straight line without tangential connection
Circular arc with tangential connection
Circular arc without tangential connection
Pole for FK programming
Pole for FK programming
To display the soft keys for free contour
programming, press the
FK key
To initiate the dialog for defining the pole, press
the
FPOL soft key. The TNC then displays the axis
soft keys of the active working plane
Enter the pole coordinates using these soft keys
The pole for FK programming remains active until you
define a new one using FPOL.