Siemens Sinumerik 840D sl Programming Manual page 188

Motion commands
10.6 Circular interpolation
I J K :
AR= :
=AC(...):
Note
Full circles (traversing angle 360°) cannot be programmed with AR=, but must be programmed
using the circle end position and interpolation parameters. Per default, the center point
coordinates I, J, K are entered in incremental dimensions in relation to the circle starting point.
You can program the absolute center point dimensions in relation to the workpiece zero block-
by-block with: I=AC(...), J=AC(...), K=AC(...). One interpolation parameter I, J, K with value 0
can be omitted, but the associated second parameter must always be specified.
Examples
Example 1: Milling
Program code
N10 G0 X67.5 Y80.211
N20 G3 X17.203 Y38.029 AR=140.134 F500
N20 G3 I–17.5 J–30.211 AR=140.134 F500
188
Circle center point in Cartesian coordinates (in X, Y, Z direction)
The meanings are as follows:
I: Coordinate of the circle center point in the X direction
J: Coordinate of the circle center point in the Y direction
K: Coordinate of the circle center point in the Z direction
Opening angle, range of values 0° to 360°
Absolute dimensions (non-modal)
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals