Programming
8.3 Axis movements
8-153
SINUMERIK 802D sl Operation and Programming Nibbling (BP-N), 06/2006 Edition
6FC5 398-3CP10-0BA0
Programming
G2/G3 X... Y... I... J... ; Center and end points
G2/G3 CR=... X... Y... ; Circle radius and end point
G2/G3 AR=... I... J... ; Aperture angle and center point
G2/G3 AR=... X... Y... ; Aperture angle and end point
G2/G3 AP=... RP=... ; Polar coordinates, circle around the pole
Note
Additional options for circular path programming are available with
CT – circle with tangential connection and
CIP – circle via intermediate point (see next sections).
Input 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 (see “Start-up Guide” 802Dsl).
Information
Full circles in a block are only possible if the center point and the end point are specified.
For circles with radius specification, the arithmetic sign of CR=... is used to select the correct
circle. It is possible to program 2 circles with the same starting and end points, as well as
with the same radius and the same direction. The negative sign in front of CR=–... deter-
mines the circle whose circle segment is greater than a semi-circle; otherwise, the circle with
the circle segment is less than or equal to the semi-circle and determined as follows:
Y
X
MP1
G2
MP2
End point
Starting point
Circle larger than semicircle
Circle smaller than or equal to
semi-circle
G2
MP1 – center point of circle 1
MP2 – center point of circle 2
Fig. 8-18 Selection of the circle from two possible circles with radius specification via the sign of CR=
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