Siemens SINUMERIK 810D Programming Guide

5
Special Motion Commands 04.00
5.2 S
p
line inter
p
olation
5
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 810D 840Di

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5-154
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
Distance between nodes:
Node distances are appropriately calculated
internally in the control, but the system is also
capable of processing user-programmed node
distances.
Programming:
PL
= Value range as for path dimension
X
Y
10 20 30 40 50 60
Check polygon
All weights 1
Different weigths
10
20
30
40
50
Example of B spline:
All weights 1 Different weights Check polygon
N10 G1 X0 Y0 F300 G64 N10 G1 X0 Y0 F300 G64 N10 G1 X0 Y0 F300 G64
N20 BSPLINE
N20 BSPLINE
N20 ;omitted
N30 X10 Y20
N30 X10 Y20 PW=2
N30 X10 Y20
N40 X20 Y40
N40 X20 Y40
N40 X20 Y40
N50 X30 Y30
N50 X30 Y30 PW=0.5
N50 X30 Y30
N60 X40 Y45
N60 X40 Y45
N60 X40 Y45
N70 X50 Y0
N70 X50 Y0
N70 X50 Y0
C SPLINE
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 3rd-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).
P1
P2
P3
P4
P6
P7
P5
C spline (cubic spline)
P1 to P7: Predefined coordinates

Siemens SINUMERIK 810D Specifications

General

Brand	Siemens
Model	SINUMERIK 810D
Category	Control Unit
Language	English