Siemens SINUMERIK 840Di sl - Page 136

Motion commands
4.6 Circular interpolation with center point and end point (G2/G3, I=, J=, K=AC...)
Fundamentals
136 Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
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
point 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)