Siemens SINUMERIK 840DE

Programming Motion Commands
4.6 Circular interpolation with center point and end point (G2/G3, I=, J=, K=AC...)
Fundamentals
4-22 Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Examples for turning
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Incremental dimension
N120 G0 X12 Z0
N125 G1 X40 Z-25 F0.2
N130 G3 X70 Z-75 I-3.335 K-29.25
N135 G1 Z-95
Absolute dimensions
N120 G0 X12 Z0
N125 G1 X40 Z-25 F0.2
N130 G3 X70 Z-75 I=AC(33.33) K=AC(-54.25)
N135 G1 Z-95