Circular Interpolation With Radius And End Point (G2/G3, Cr) - Siemens SINUMERIK 840Di sl Programming Manual

4.7

Circular interpolation with radius and end point (G2/G3, CR)

The circular movement is described by the:
• Circle radius CR= and
• the end point in Cartesian coordinates X, Y, Z.
In addition to the circle radius, you must also specify the leading sign +/– to indicate whether
the traversing angle is to be greater than or less than 180°. A positive leading sign can be
omitted.
Note
There is no practical limitation on the maximum size of the programmable radius.
Programming
G2/G3 X... Y... Z... CR=
Or
G2/G3 I... J... K... CR=
Parameters
G2
G3
X Y Z
I J K
CR=
Note
You don't need to specify the center point with this procedure. Full circles (traversing angle
360°) cannot be programmed with CR=, but must be programmed using the circle end point
and interpolation parameters.
Example of milling
Programming a circle with radius and end point
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
4.7 Circular interpolation with radius and end point (G2/G3, CR)
Circular interpolation, CW
Circular interpolation counterclockwise
End point in Cartesian coordinates. These data depend on the motion
commands G90/G91 or ...=AC(...)/...=IC(..)
Circle center point in Cartesian coordinates (in X, Y, Z direction)
The identifiers have the following meanings:
I: Coordinate of the circle center point in the X direction
J: Coordinate of the circle center point in the Y direction
K: Coordinate of the circle center point in the Z direction
Circle radius
Here:
CR=+...: Angle less than or equal to 180°
CR=–...: Angle more than 180°
Motion commands
139