Siemens SINUMERIK 828D Programming Manual page 243

4.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN, EAUTO, ENAT,
Spline type
C spline
Job planning
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
Properties and use
Features:
The passes precisely through the specified intermediate points along the
•
curve.
The curve characteristic is tangential with continuous curvature.
•
Frequently generates undesirable oscillations, especially at positions where
•
the gradient changes significantly.
The area of influence of changes to the intermediate points is global. This
•
means that if an intermediate point is changed then this influences the
complete curved characteristic.
Application:
The C spline can be well used if the intermediate points lie on a curve that can
be analytically calculated defined (circle, parabola, hyperbola).
Special Motion Commands
ETAN, PW, SD, PL)
243