Programming manual
CNC 8070
COORDINATE SYSTEM
Coordinate programming
3.
(SOFT V02.0X)
39
3.5.2 Polar coordinates
When having circular elements or angular dimensions, polar
coordinates may be more convenient to express the coordinates of the
various points in the plane.
This type of coordinates requires a reference point referred to as "polar
origin" that will be the origin of the polar coordinate system.
Definition of position values
The position of the various points is given by defining the radius "R"
and the angle "Q" as follows:
Radius It will be the distance between the polar origin and the
point.
Angle It will be the one formed by the abscissa axis and the line
joining the polar origin with the point.
The radius may be given in mm or in inches whereas the angle is given
in degrees.
Both values may be given in either absolute (G90) or incremental
(G91) coordinates.
• When working in G90, the "R" and "Q" values will be absolute. The
value assigned to the radius must always be positive or zero.
• When working in G91, the "R" and "Q" values will be incremental.
Although negative "R" values may be programmed, when
programming in incremental coordinates, the resulting value
assigned to the radius must always be positive or zero.
When programming a "Q" value greater than 360º, the module will be
assumed after dividing it by 360. Thus, Q420 is the same as Q60 and
Q-420 is the same as Q-60.
RRadius
Q Angle
O
P
Polar origin
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