Siemens SINUMERIK 840DE

Programming Motion Commands
4.6 Circular interpolation with center point and end point (G2/G3, I=, J=, K=AC...)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
4-21
Note
G2 and G3 are modal.
The G90/G91 defaults for absolute or incremental dimensions are only valid for the circle
end point.
The center point coordinates I, J, K are normally entered in incremental dimensions with
reference to the circle starting point.
You program the absolute center point non-modally with reference to the workpiece zero
with: I=AC(…), J=AC(…), K=AC(…). An interpolation parameter I, J, K with value 0 can be
omitted but the second associated parameter must always be specified.
Examples for milling
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Incremental dimension
N10 G0 X67.5 Y80.211
N20 G3 X17.203 Y38.029 I–.5 J–.211 F500
Absolute dimensions
N10 G0 X67.5 Y80.211
N20 G3 X17.203 Y38.029 I=AC(50) J=AC(50)