Siemens SINUMERIK 840Di sl Programming Manual page 140

Motion commands
4.7 Circular interpolation with radius and end point (G2/G3, CR)
N10 G0 X67.5 Y80.511
N20 G3 X17.203 Y38.029 CR=34.913 F500
Example of turning
Programming a circle with radius and end point
N125 G1 X40 Z-25 F0.2
N130 G3 X70 Z-75 CR=30
N135 G1 Z-95
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals