HEIDENHAIN TNC 426 (280 476) - Manual (Page 187)

160 6 Programming: Programming Contours
6.6 P
a
th Cont
ours
—
FK F
ree Cont
our Pr
ogr
a
mming
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.
Free programming of straight lines
Straight line without tangential connection
7 7 7 7 To display the soft keys for free contour programming,
press the FK key.
7 7 7 7 To initiate the dialog for free programming of straight
lines, press the FL soft key. The TNC displays
additional soft keys.
7 7 7 7 Enter all known data in the block by using these soft
keys. The FK graphic displays the programmed
contour element in red until sufficient data are
entered. If the entered data describe several
solutions, the graphic will display the contour element
in green (see “Graphics during FK programming,”
page 159).
Straight line with tangential connection
If the straight line connects tangentially to another contour element,
initiate the dialog with the FLT soft key:
7 7 7 7 To display the soft keys for free contour programming,
press the FK key.
7 7 7 7 To initiate the dialog, press the FLT soft key.
7 7 7 7 Enter all known data in the block by using the soft
keys.
Contour element Soft key
Straight line with tangential connection
Straight line without tangential connection
Circular arc with tangential connection
Circular arc without tangential connection
Pole for FK programming