Circular Interpolation With Center Point And End Point (G2/G3, I=, J=, K=Ac - Siemens SINUMERIK 840DE Programming Manual

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
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)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1

4.6 Circular interpolation with center point and end point (G2/G3, I=, J=, K=AC...)

Programming Motion Commands
4-21