Siemens sinumerik 808d Programming And Operating Manual page 39

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.
Programming example: Definition of center point and end point
Figure 1-11
N5 G90 Z30 X40
N10 G2 Z50 X40 K10 I-7
Note
Center point values refer to the circle starting point!
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
Example for center point and end point
; Starting point circle for N10
; End point and center point
; Opening angle and end point
; Polar coordinates, circle around the pole
Programming principles
1.3 Axis movements
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