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6 Path Contours—FK Free Contour Programming

6 Path Contours—FK Free Contour Programming

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6.6 Path Contours—FK Free Contour Programming

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
command.

Creating FK programs for TNC 4xx:
For a TNC 4xx to be able to load FK programs created on
an iTNC 530, the individual FK elements within a block
must be in the same sequence as displayed in the soft-key
row.

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6.6 Path Contours—FK Free Contour Programming

Graphics during FK programming
If you wish to use graphic support during FK
programming, select the PROGRAM + GRAPHICS screen
layout (see “Programming and Editing” on page 79).
Incomplete coordinate data often is 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:
Blue
Green
Red

The contour element is fully defined
The entered data describe a limited number of possible
solutions: select the correct one
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:
U

Press the SHOW SOLUTION soft key repeatedly until
the correct contour element is displayed. Use the
zoom function (2nd soft-key row) if you cannot
distinguish possible solutions in the standard setting

U

The contour element shown corresponds to the
drawing: With the SELECT SOLUTION soft key the
TNC inserts the desired solution with the NC block
FSELECTn, where n designates the internal solution
number. You should not change the solution number
n by direct editing, but by restarting the programming
graphics and pressing the SHOW SOLUTION soft key

If you do not yet wish to select a green contour element, press the
END SELECT soft key to continue the FK dialog.
Select the green contour elements as soon as possible
with the SELECT SOLUTION soft key. This way you can
reduce the ambiguity of subsequent elements.
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.
Show block number in graphic window
To show a block number in the graphic window:
U

250

Set the SHOW OMIT BLOCK NR. soft key to SHOW
(soft-key row 3)

Programming: Programming Contours

6.6 Path Contours—FK Free Contour Programming

Converting FK programs into HEIDENHAIN
conversational format
The TNC features two possibilities for converting FK programs to
plain-language programs:
„ Convert the program so that the program structure is maintained
(program-section repeats and subprogram calls). Cannot be applied
if you have used Q-parameter functions in the FK sequence.
„ Convert the program so that program-section repeats, subprogram
calls and Q-parameter calculations are linearized. For linearization,
instead of the program-section repeats and subprogram calls, the
TNC writes the NC blocks processed internally into the generated
program or calculates values assigned via Q-parameter calculations
within an FK sequence.
U

Select the program you want to convert

U

Press the Special Functions key

U

Press the Programming Aids soft key.

U

Select the soft-key row with functions for converting
programs

U

Convert the FK blocks of the selected program. The
TNC converts all FK blocks into straight-line blocks
(L) and circular-arc blocks (CC, C), and the program
structure is maintained, or

U

Convert the FK blocks of the selected program. The
TNC converts all FK blocks into straight-line blocks
(L) and circular-arc blocks (CC, C), and the TNC
linearizes the program

The name of the file created by the TNC consists of the
old file name plus the extension _nc. Example:
„ File name of the FK program: LEVER.H
„ File name of the conversational dialog program
converted by the TNC: LEVEL_nc.h
The resolution of the created conversational program is
0.1 µm.
After the converted NC blocks, the converted program
includes the comment SNR and a number. The number
indicates the block number of the FK program from which
the respective conversational block was calculated.

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.

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6.6 Path Contours—FK Free Contour Programming

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.
FK 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

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Programming: Programming Contours

6.6 Path Contours—FK Free Contour Programming

Pole for FK programming
U

To display the soft keys for free contour programming,
press the FK key

U

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

U

Enter the pole coordinates using these soft keys

The pole for FK programming remains active until you
define a new one using FPOL.

Free programming of straight lines
Straight line without tangential connection
U To display the soft keys for free contour programming,
press the FK key
U

To initiate the dialog for free programming of straight
lines, press the FL soft key. The TNC displays
additional soft keys

U

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 is entered.
If the entered data describes several solutions, the
graphic will display the contour element in green (see
"Graphics during FK programming", page 250)

Straight line with tangential connection
If the straight line connects tangentially to another contour element,
initiate the dialog with the FLT soft key:
U

To display the soft keys for free contour programming,
press the FK key

U

To initiate the dialog, press the FLT soft key

U

Enter all known data in the block by using the soft
keys.

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6.6 Path Contours—FK Free Contour Programming

Free programming of circular arcs
Circular arc without tangential connection
U To display the soft keys for free contour programming,
press the FK key.
U

To initiate the dialog for free programming of circular
arcs, press the FC soft key. The TNC displays soft
keys with which you can directly enter data on the
circular arc or the circle center.

U

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 is entered.
If the entered data describes several solutions, the
graphic will display the contour element in green (see
"Graphics during FK programming", page 250)

Circular arc with tangential connection
If the circular arc connects tangentially to another contour element,
initiate the dialog with the FCT soft key:
U

To display the soft keys for free contour programming,
press the FK key.

U

To initiate the dialog, press the FCT soft key.

U

Enter all known data in the block by using the soft
keys

Input possibilities
End point coordinates
Known data

Soft keys

Y

Cartesian coordinates X and Y
Polar coordinates referenced to FPOL

R15

30

30°
20

Example NC blocks
7 FPOL X+20 Y+30
8 FL IX+10 Y+20 RR F100
9 FCT PR+15 IPA+30 DR+ R15
20

254

10

X

Programming: Programming Contours

Known data
Length of a straight line

Soft keys

Y

Gradient angle of a straight line

IAN

AN

Chord length LEN of an arc

LEN


Gradient angle AN of an entry tangent
Center angle of an arc

X

Example NC blocks
27 FLT X+25 LEN 12.5 AN+35 RL F200
28 FC DR+ R6 LEN10 AN-45

Y

29 FCT DR- R15 LEN 15

35°

5
R1

.5
12

R6

10

15
45°
25

HEIDENHAIN iTNC 530

X

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6.6 Path Contours—FK Free Contour Programming

Direction and length of contour elements

6.6 Path Contours—FK Free Contour Programming

Circle center CC, radius and direction of rotation in the FC/FCT
block
The TNC calculates a circle center for free-programmed arcs from the
data you enter. This makes it possible to program full circles in an FK
program block.

Y

If you wish to define the circle center in polar coordinates you must
use FPOL, not CC, to define the pole. FPOL is entered in Cartesian
coordinates and remains in effect until the control encounters a block
in which another FPOL is defined.
A circle center that was calculated or programmed
conventionally is then no longer valid as a pole or circle
center for the new FK contour: If you enter conventional
polar coordinates that refer to a pole from a CC block you
have defined previously, then you must enter the pole
again in a CC block after the FK contour.

5

R3
15

FPOL
CC

40°

X
20

Known data

Soft keys

Circle center in Cartesian coordinates
Circle center in polar coordinates
Rotational direction of an arc
Radius of an arc

Example NC blocks
10 FC CCX+20 CCY+15 DR+ R15
11 FPOL X+20 Y+15
12 FL AN+40
13 FC DR+ R15 CCPR+35 CCPA+40

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Programming: Programming Contours

6.6 Path Contours—FK Free Contour Programming

Closed contours
You can identify the beginning and end of a closed contour with the
CLSD soft key. This reduces the number of possible solutions for the
last contour element.

Y

Enter CLSD as an addition to another contour data entry in the first and
last blocks of an FK section.
Beginning of contour:
End of contour:

CLSD+
CLSD–

CLSD+

Example NC blocks
12 L X+5 Y+35 RL F500 M3
13 FC DR- R15 CLSD+ CCX+20 CCY+35
...

CLSD–

X

17 FCT DR- R+15 CLSD-

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6.6 Path Contours—FK Free Contour Programming

Auxiliary points
For both free-programmed straight lines and free-programmed circular
arcs, you can enter the coordinates of auxiliary points that are located
on the contour or in its proximity.
Auxiliary points on a contour
The auxiliary points are located on the straight line, the extension of
the straight line, or on the circular arc.
Known data

Y

Soft keys
60.071
53

X coordinate of an auxiliary
point
P1 or P2 of a straight line

R10
70°

Y coordinate of an auxiliary
point
P1 or P2 of a straight line
X coordinate of an auxiliary
point
P1, P2 or P3 of a circular arc

50
42.929

Y coordinate of an auxiliary
point
P1, P2 or P3 of a circular arc

X

Auxiliary points near a contour
Known data

Soft keys

X and Y coordinates of an auxiliary point near
a straight line
Distance of auxiliary point to straight line
X and Y coordinates of an auxiliary point near
a circular arc
Distance of auxiliary point to circular arc

Example NC blocks
13 FC DR- R10 P1X+42.929 P1Y+60.071
14 FLT AN-70 PDX+50 PDY+53 D10

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Programming: Programming Contours

Data whose values are based on another contour element are called
relative data. The soft keys and program words for entries begin with
the letter R for Relative. The figure at right shows the entries that
should be programmed as relative data.

Y
20

The block number of the contour element on which the
relative data are based can only be located up to 64
positioning blocks before the block in which you program
the reference.
If you delete a block on which relative data are based, the
TNC will display an error message. Change the program
first before you delete the block.

20

45°
20°

10

R20

The coordinates and angles for relative data are always
programmed in incremental dimensions. You must also
enter the block number of the contour element on which
the data are based.

90°

FPOL

10

35

X

Data relative to block N: End point coordinates
Known data

Soft keys

Cartesian Coordinates
relative to block N
Polar coordinates relative to block N

Example NC blocks
12 FPOL X+10 Y+10
13 FL PR+20 PA+20
14 FL AN+45
15 FCT IX+20 DR- R20 CCA+90 RX 13
16 FL IPR+35 PA+0 RPR 13

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6.6 Path Contours—FK Free Contour Programming

Relative data