HEIDENHAIN iTNC 530 (340 49x-02) ISO programming - Manual (Page 205)

HEIDENHAIN TNC iTNC 530 205
6.4 P
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Circle center I, J
You can define a circle center for circles that are programmed with the
functions G02, G03 or G05. This is done in the following ways:
„ Entering the Cartesian coordinates of the circle center, or
„ Using the last programmed circle center (G29),
„ Transferring the coordinates with the actual-position-capture
function.
Programming
8 Enter the coordinates for the circle center, or
if you want to use the last programmed position,
enter G29.
Example NC blocks
or
The program blocks N10 and N20 do not refer to the illustration.
Duration of effect
The circle center definition remains in effect until a new circle center
is programmed. You can also define a circle center for the secondary
axes U, V and W.
Entering incremental values for the circle center I, J
If you enter the circle center with incremental coordinates, you have
programmed it relative to the last programmed position of the tool.
N50 I+25 J+25 *
N10 G00 G40 X+25 Y+25 *
N20 G29 *
The only effect of I and J is to define a position as a circle
center—the tool does not move to the position.
The circle center is also the pole for polar coordinates.
If you wish to define the pole in parallel axes, first press
the I (J) key on the ASCII keyboard, and then the orange
axis key for the corresponding parallel axis.
CC
Z
Y
X
I
J