HEIDENHAIN TNC 410 - Manual (Page 105)

92 6 Programming: Programming Contours
6.6 Path Contours –
FK Free Contour Programming
Fundamentals
Workpiece drawings that are not dimensioned for NC often contain
unconventional coordinate data that cannot be entered with the
gray path function keys. You may, for example, have only the
following data on a specific contour element:
■ Known coordinates on the contour element or in its proximity
■ Coordinate data that are referenced to another contour element
■ Directional data and data regarding the course of the contour
You can enter such dimensional data directly by using the FK free
contour programming function. The TNC derives the contour from
the known coordinate data and supports the programming dialog
with the interactive programming graphics. The figure to the upper
right shows a workpiece drawing for which FK programming is the
most convenient programming method.
If you wish to run FK programs on old TNC models, use the
conversion function (see „4.2 File Management; Converting an FK
program into HEIDENHAIN conversational format“).
Graphics during FK programming
Incomplete coordinate data often are not sufficient to fully define a
workpiece contour. In this case, the TNC indicates the possible
solutions in the FK graphic. You can then select the contour that
matches the drawing. The FK graphic displays the elements of the
workpiece contour in different colors:
White The contour element is fully defined.
Green The entered data describe a limited number of
possible solutions: select the correct one.
Red The entered data are not sufficient to determine the
contour element: enter further data.
If the entered data permit a limited number of possible solutions
and the contour element is displayed in green, select the correct
contour element as follows:
ú Press the SHOW soft key repeatedly until the correct
contour element is displayed.
ú If the displayed contour element matches the
drawing, select the contour element with FSELECT.
Select the green contour elements as soon as possible with the
FSELECT soft key. In this way, you can reduce the ambiguity of
subsequent elements.
6.6 P
ath Cont
ours — FK F
ree Cont
our Pr
ogr
amming