Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 72

The description of the desired circle can be given in various ways:
G2/G3 remains active until canceled by another instruction from this G group (G0, G1...).
The path velocity is determined by the programmed F word.
Programming
G2/G3 X... Y... I... J...
G2/G3 CR=... X... Y...
G2/G3 AR=... I... J...
G2/G3 AR=... X... Y...
G2/G3 AP=... RP=...
Note
Further possibilities for circle programming result from:
CT - circle with tangential connection and
CIP - circle via intermediate point (see next sections).
Entering tolerances for the circle
Circles are only accepted by the control system with a certain dimensional tolerance. The circle radius at the starting and
end points are compared here. If the difference is within the tolerance, the center point is exactly set internally. Otherwise,
an alarm message is issued.
The tolerance value can be set via machine data.
72
; End point and center point
; Circle radius and end point
; Opening angle and center point
; Opening angle and end point
; Polar coordinates, circle around the pole
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015