Special Motion Commands; Spline Interpolation (Aspline, Bspline, Cspline, Bauto, Bnat, Btan, Eauto, Enat, Etan, Pw, Sd, Pl) - Siemens Sinumerik 840D sl Programming Manual

Special Motion Commands

4.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN, EAUTO, ENAT, ETAN, PW, SD,
4.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT,
BTAN, EAUTO, ENAT, ETAN, PW, SD, PL)
Function
Random curved workpiece contours cannot be precisely defined in an analytic form. This is
the reason that these type of contours are approximated using a limit number of points along
curves, e.g. when digitizing surfaces. The points along the curve must be connected to define
a contour in order to generate the digitized surface of a workpiece. Spline interpolation
permits this.
A spline defines a curve, which is formed from polynomials of 2nd or 3rd degree. The
characteristics of the points along the curve of a spline can be defined depending on the
spline type being used.
For SINUMERIK solution line, the following spline types are available:
• A spline
• B spline
• C spline
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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