Fagor 8025 T CNC, Operating Manual

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8025/8030 CNC PROGRAMMING MANUAL 15
6.2.3.1. Circular interpolation in cartesian coordinates by programming the radius
of the arc
The format is as follows:
In mm : G02(G03) X+/-4.3 Z+/-4.3 R+/-4.3
In inches : G02(G03) X+/-3.4 Z+/-3.4 R+/-3.4
G02(G03) being the function which defines the circular interpolation direction.
X coordinate value of the arc’s final point along X axis.
Z coordinate value of the arc’s final point along Z axis.
R= Arc’s radius.
That means that the circular interpolation can be programmed with its final point plus the
radius instead of the center (I,K) coordinates.
If the arc is smaller than 180º, the radius will be programmed with positive sign and if it
is bigger than 180º, the sign will be negative.
If P0 is the starting point and P1 is the final point of the arc, for a same value of R, there
are four different arcs which pass through both points.
By combining the direction (G02/G03) and the sign of R(+/-) the required arc is identified.
In this way, the format of the programming of the drawing’s arcs is as follows:
Arc 1 G02 X Z R-
Arc 2 G02 X Z R+
Arc 3 G03 X Z R+
Arc 4 G03 X Z R-
XZ being the final point in cartesian coordinates.
Atention:
If an entire circle is programmed by the radius programming, the CNC
will display error 47, as there are infinite solutions.