119HEIDENHAIN TNC 426 B, TNC 430
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.
If you do not yet wish to select a green contour element, press the
EDIT soft key to continue the FK dialog.
The machine tool builder may use other colors for the FK
graphics.
NC blocks from a program that you called with PGM
CALL are displayed in another color.
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 table on the right. 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.
The following prerequisites for FK programming must
be observed:
The FK free contour programming feature can only be
used for programming contour elements that lie in the
working plane. The working plane is defined in the first
BLK FORM block of the part program.
You must enter all available data for every contour
element. Even the data that does not change must be
entered in every block — otherwise it will not be
recognized.
Q parameters are permissible in all FK elements, except
in elements with relative references (e.g. RX or RAN), or
in elements that are referenced to other NC blocks.
If both FK blocks and conventional blocks are entered in a
program, the FK contour must be fully defined before
you can return to conventional programming.
The TNC needs a fixed point from which it can calculate
the contour elements. Use the gray path function keys to
program a position that contains both coordinates of the
working plane immediately before programming the FK
contour. Do not enter any Q parameters in this block.
If the first block of an FK contour is an FCT or FLT block,
you must program at least two NC block with the gray
path function keys to fully define the direction of contour
approach.
Do not program an FK contour immediately after an LBL
label.
Contour element Soft key
Straight line with tangential connection
Straight line without tangential connection
Circular arc with tangential connection
Circular arc without tangential connection
6.6 Path Contours — FK Free Contour Programming
Gkap6.pm6 30.06.2006, 07:04119
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