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

Siemens AG 2000. All rights reserved
5-152
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
Additional notes
A, B and C splines are modally active and belong to
the group of motion commands. The toolradius
offseet may be used. Collision monitoring is carried
out in the projection in the plane.
Axes that are to interpolate in the spline grouping are
selected with command SPLINEPATH (further
details on the following pages).
Sequence
A SPLINE
The A spline (Akima spline) passes exactly through
the intermediate points. While it produces virtually no
undesirable oscillations, it does not create a
continuous curve in the interpolation points.
The akima spline is local, i.e. a change to an
interpolation point affects only up to 6 adjacent
points.
The primary application for this spline type is
therefore the interpolation of digitized points.
Supplementary conditions can be programmed for
akima splines (see below for more information). A
3rd-degree polynomial is used for interpolation.
P1
P2
P3
P4
P6
P7
P5
A spline (Akima spline)
P1 to P7: Predefined coordinates

Siemens SINUMERIK 810D Specifications

General

Brand	Siemens
Model	SINUMERIK 810D
Category	Control Unit
Language	English