Siemens SINUMERIK 828D Programming Manual page 218

Motion commands
9.6 Circular interpolation
Example 2: Turning
Center point data using incremental dimensions
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
Center point data using 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
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Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals