Siemens SINUMERIK 840D sl Programming Manual

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Motion commands9.6 Circular interpolationFundamentals216 Programming Manual, 09/2011, 6FC5398-1BP40-2BA09.6.3 Circular interpolation with radius and end point (G2/G3, X... Y... Z.../ I... J... K..., CR)FunctionThe circular motion is described by the:• Circle radius CR=and• End point in Cartesian coordinates X, Y, Z.In addition to the circle radius, you must also specify the leading sign +/– to indicate whetherthe traversing angle is to be greater than or less than 180°. A positive leading sign can beomitted.SyntaxG2/G3 X… Y… Z… CR=G2/G3 I… J… K… CR=SignificanceNoteThere is no practical limitation on the maximum size of the programmable radius.G2: Circular interpolation clockwiseG3: Circular interpolation counter-clockwiseX Y Z : End point in Cartesian coordinates. These specifications depend on thetravel commands G90/G91 or ...=AC(...)/...=IC(..)I J K : 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 directionJ: Coordinate of the circle center point in the Y directionK: Coordinate of the circle center point in the Z directionCR= : Circle radiusThe identifiers have the following meanings:CR=+…: Angle less than or equal to 180°CR=–…: Angle more than 180°NoteYou don't need to specify the center point with this procedure. Full circles (traversing angle360°) are not programmed with CR=, but via the circle end position and interpolationparameters.