Heidenhain TNC 620 (81760x-01) ISO programming User Manual Page 201

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Path contours - Cartesian coordinates 6.4
6
TNC 620 | User's Manual for DIN/ISO Programming | 3/2014
201
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:
Entering the Cartesian coordinates of the circle center in the
working plane, or
Using the circle center defined in an earlier block, or
Capturing the coordinates with the actual-position-capture key
To program the circle center, press the SPEC FCT
key
Press the PROGRAM FUNCTIONS soft key
Press the DIN/ISO soft key
Press the I or J soft key
Enter coordinates for the circle center or, if you
want to use the last programmed position, G29
coordinates
Example NC blocks
N50 I+25 J+25 *
or
N10 G00 G40 X+25 Y+25 *
N20 G29 *
The program blocks 10 and 11 do not refer to the illustration.
Validity
The circle center definition remains in effect until a new circle
center is programmed.
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.
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.
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