Siemens sinumerik 840d Programming Manual page 157

04.00
5
840D 840D
NCU 571 NCU 572
NCU 573
What does which spline do?
Comparison of three spline types with identical
interpolation points:
A spline (akima spline)
B spline (Bezier spline)
C spline (cubic spline)
Spline grouping
Up to eight path axes can be involved in a spline
interpolation grouping. The SPLINEPATH instruction
defines which axes are to be involved in the spline.
The instruction is programmed in a separate block. If
SPLINEPATH is not explicitly programmed, then the
first three axes in the channel are traversed as the
spline grouping.
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition
FM-NC 810D 840Di
Special Motion Commands
5.2 Spline interpolation
P4
P5
P3
P2
P1
A spline
B spline
C spline
5
P6
P7
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