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, PL)
References
● Function Manual Expanded Functions; Indexing Axes (T1)
● Function Manual, Synchronized Actions
4.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO,
BNAT, BTAN, EAUTO, ENAT, ETAN, PW, SD, PL)
Function
Randomly curved workpiece contours cannot be precisely defined in an analytic form. This is
the reason why these type of contours are approximated using a limited 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, 03/2013, 6FC5398-2BP40-3BA1
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