Siemens SINUMERIK 840D sl Programming Manual page 173

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In contrast to the akima spine, the cubic spline is continuously curved in the intermediate

points. It tends to have unexpected fluctuations however. It can be used in cases where the

interpolation points lie along an analytically calculated curve. C splines use third degree

polynomials.

The spline is not local, i.e. changes to an interpolation point can influence a large number of

blocks (with gradually decreasing effect).

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Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

5.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN)

Special Motion Commands