Siemens SINUMERIK 840D

5
04.00 Special Motion Commands
5.2 S
p
line inter
p
olation
5
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 840Di

Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
5-151
5.2 Spline interpolation
Introduction
The spline interpolation function can be used to link
series of points along smooth curves. Splines can be
applied, for example, to create curves using a
sequence of digitized points.
There are several types of spline with different
characteristics, each producing different interpolation
effects. In addition to selecting the spline type, the
user can also manipulate a range of different
parameters. Several attempts are normally required
to obtain the desired pattern.
P1
P2
P3
P4
P5
P6
P1 to P6: Predefined coordinates
Programming
ASPLINEX Y Z A B C
or
BSPLINE X Y Z A B C
or
CSPLINE X Y Z A B C
Function
In programming a spline, you link a series of points
along a curve.
You can select one of three spline types:
−
A spline (akima spline)
−
B spline (non-uniform, rational basis spline,
NURBS)
−
C spline (cubic spline)