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Siemens SINUMERIK 840D Programming Manual

Siemens SINUMERIK 840D
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Special Motion Commands
5.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN)
Job planning
5-4 Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
Parameters
ASPLINE The Akima spline passes as tangent through the intermediate
points.
BSPLINE The B spline does not pass directly through the control points
but only near them. The programmed positions are not
interpolation points but only control points.
CSPLINE Cubic spline with transitions to the interpolation points both
tangentially and in terms of curvature.
A, B and C splines are modally active and belong to the group of motion commands.
The tool radius offset may be used.
Collision monitoring is carried out in the projection in the plane.
Note
Parameters for A-SPLINE and C-SPLINE
For the Akima spline (A spline) and the Cubic spline (C spline), restrictions for the transition
behavior at the start and the end of the spline curve can be programmed.
These restrictions for the transition behavior are divided into two groups with statements
each with three commands as follows:
Start of spline curve:
BAUTO No command input; start is determined by the position of the
first point
BNAT Zero curvature
BTAN Tangential transition to preceding block (initial setting)
End of spline curve:
EAUTO No command input; end is determined by the position of the
last point
ENAT Zero curvature
ETAN Tangential transition to next block (initial setting)

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Siemens SINUMERIK 840D Specifications

General IconGeneral
SeriesSINUMERIK 840D
AxesUp to 31
ChannelsUp to 10
Operating SystemWindows-based
Power Supply24 V DC
Control Unit TypeCNC
InterfaceEthernet, PROFIBUS
DisplayTFT color display
InterpolationSpline
PLCIntegrated PLC
Data StorageCompactFlash, USB

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