Programming manual.
CNC 8070
8.
PATH CONTROL.
Circular interpolation (G02/G03).
·152·
(REF: 1709)
8.3.4 Polar coordinates.
The arc is defined by programming function G02 or G03 followed by the coordinates of the
arc's end point (radius and angle) and those of its center (relative to the starting point of the
arc) according to the axes of the active work plane.
Programming format.
The programming format is the following; the arguments appear between curly brackets and
the optional ones, between angle brackets.
G02/G03 <R{final_radius}> <Q{final_angle}> <I..K{center}>
End point of the arc.
The end point is defined by its polar coordinates, radius (R) and the angle (Q) of the end point
relative to the polar origin. The "R" radius will be the distance between the polar origin and
the point. The "Q" angle will be formed by the abscissa axis and the line joining the polar
origin with the point. If the angle or the radius is not programmed, it keeps the value
programmed for the last move.
If the angle or the radius is not programmed, it keeps the value programmed for the last move.
The radius and the angle may be defined both in absolute (G90) and incremental coordinates
(G91). When programming the angle in G91, it is incremented with respect to the polar origin
of the previous point; if programmed in G90, It indicates the angle formed with the horizontal
going through the polar origin.
Programming a 360º angle in G91 means programming a whole circle. Programming a 360º
angle in G90 means programming an arc where the target point forms a 360º angle with the
horizontal going through the polar origin.
Arc center referred to starting point.
The coordinates of the center are measured according to the starting point. The arc center
must be defined in cartesian coordinates by the letters "I", "J" or "K" depending on the active
plane. When one of the center coordinates is zero, it does not have to be programmed; if
neither of them are programmed, it will assume the polar origin as the arc center. These
coordinates are not affected by functions G90 and G91.
R{final_radius} Optional. Radius of the end point of the arc.
Units: Millimeters, inches or degrees.
Q{final_angle} Optional. Angle of the end point of the arc.
Units: Millimeters, inches or degrees.
I..K{center} Optional. Arc center referred to starting point.
Units: mm or inches.
G02 R50 Q25 I28 J13
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