Siemens Sinumerik 840D sl Programming Manual page 190

Motion commands
10.6 Circular interpolation
AP= :
RP= :
Examples
Example 1: Milling
Program code
N10 G0 X67.5 Y80.211
N20 G111 X50 Y50
N30 G3 RP=34.913 AP=200.052 F500
Example 2: Turning
190
End point in polar coordinates, in this case polar angle
End point in polar coordinates, in this case polar radius corresponds to circle radius
X
3
25
54.25
95
Z
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals