Siemens SINUMERIK 808D Programming And Operating Manual page 24

Circular interpolation:
In order to start the circular interpolation, the commands given in the following table are to be executed:
Element
Direction of rotation
End-point position
Distance start point - center point
Radius of arc
Direction of rotation
The direction of rotation of the arc is defined with the G functions listed in the table given below:
Direction of rotation
G02
G03
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Command Description
G02 clockwise
G03 Counterclockwise
X (U) X coordinate of the arc end point (diametric
value)
Z (W) Z coordinate of the arc end point
Y (V) Y coordinate of the arc end point
I Distance of the start point to the center point of
the arc in the X-axis
J Distance of the start point to the center point of
the arc in the Y-axis
K Distance of the start point to the center point of
the arc in the Z-axis
R Distance of the start point to the center of arc
clockwise
Counterclockwise
Programming and Operating Manual (ISO Turning/Milling)
01/2017