Siemens sinumerik 840d Programming Manual page 327

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The feed is approached according to a cubic

characteristic from the current feed value to the

programmed F value until the end of the block. The

control uses splines to connect all the feed values

programmed non-modally that have an active FCUB.

The feed values act here as interpolation points for

calculation of the spline interpolation.

N50 F1400 FCUB X50

N60 F2000 X47

N70 F3800 X52

F=FPO(...,...,...)

The feed characteristic is programmed directly via a

polynomial. The polynomial coefficients are specified

according to the same method used for polynomial

interpolation.

F=FPO(endfeed, quadf, cubf)

endfeed, quadf and cubf are previously

defined variables.

With an active FCUB, the spline is linked tangentially

to the characteristic defined via FPO at the block

beginning and block end.

Supplementary conditions

The functions for programming the path traversing

characteristics apply regardless of the programmed

feed characteristic.

SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition

9.5 Feed characteristic, FNORM, FLIN, FCUB, FPO

Feed at block end

Quadratic polynomial coefficient

Cubic polynomial coefficient

Path Traversing Behavior

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