200 Programming: Programming Contours
6.4 Path Contours—Cartesian Coordinates
Circle center I, J
You can define a circle center for circles that you have programmed
with the G02, G03 or G05 function. This is done in the following ways:
îš„ Entering the Cartesian coordinates of the circle center in the
working plane, or
îš„ Using the circle center defined in an earlier block, or
îš„ Capturing the coordinates with the ACTUAL-POSITION-CAPTURE
key
U 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 10 and 11 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 the circle center incrementally
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 CC is to define a position as circle
center: The tool does not move to this 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.
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