Fagor 8025 GP, Operating Manual

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32 8025/8030 CNC PROGRAMMING MANUAL
6.6. G09. ARC PROGRAMMED BY THREE POINTS
Two points (the final plus one intermediate point) are sufficient to program an arc provided
that the actual position is the starting point. In other words, an intermediate point is
programmed instead of the center.
This feature can be useful when a part is programmed in PLAY BACK and after writing
G09 in the block the machine can be manually shifted to the intermediate point of the arc
and press ENTER. Then to the final point and press ENTER. In this way, the block will
be stored in the memory.
Cartesian coordinates (XY plane)
N4 G09 X+/-4.3 Y+/-4.3 I+/-4.3 J+/-4.3
N4 : Block number.
G09 : Code identifying 3 point arc definition.
X+/-4.3 : X value of the arc’s final point.
Y+/-4.3 : Y value of the arc’s final point.
I+/-4.3 : X value of the intermediate point.
J+/-4.3 : Y value of the intermediate point.
Polar coordinates (XY plane)
N4 G09 R+/-4.3 A+/-4.3 I+/-4.3 J+/-4.3
N4 : Block number.
G09 : Code identifying 3 point arc definition.
R+/-4.3 : Radius (referred to polar origin) of the final point of the arc.
A+/-4.3 : Angle (referred to polar origin) of the final point of the arc.
I+/-4.3 : X value of the intermediate point.
J+/-4.3 : Y value of the intermediate point.
The intermediate point must always be programmed in cartesian coordinates.