HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 179)

HEIDENHAIN TNC 620 179
6.6 P
a
th Cont
ours—FK F
ree Cont
our Pr
ogr
amming (Sof
tw
ar
e Option)
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 blocks 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.
Creating FK programs for TNC 4xx:
For a TNC 4xx to be able to load FK programs created on
an TNC 620, the individual FK elements within a block
must be in the same sequence as displayed in the soft-key
row.