Feed Characteristic, Fnorm, Flin, Fcub, Fpo - Siemens sinumerik 840d Programming Manual

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840D 840D
NCU 571 NCU 572
NCU 573
9.5

Feed characteristic, FNORM, FLIN, FCUB, FPO

Programming
F... FNORM
F... FLIN
F... FCUB
F=FPO(...,...,...)
Explanation
FNORM
FLIN
FCUB
F=FPO...
Function
To permit flexible definition of the feed
characteristic, the feed programming according
to DIN 66205 has been extended by linear and
cubic characteristics. The cubic characteristics
can be programmed either directly or as
interpolating splines.
These additional characteristics make it possible to
program continuously smooth velocity characteristics
depending on the curvature of the workpiece to be
machined.
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
9.5 Feed characteristic, FNORM, FLIN, FCUB, FPO
840Di
Basic setting. The feed value is specified as a function of the traverse
path of the block and is then valid as a modal value.
Path velocity profile linear:
The feed value is approached linearly via the traverse path from the
current value at the block beginning to the block end and is then valid as
a modal value.
Path velocity profile cubic:
The non-modally programmed F values are connected by means of a
spline referred to the block end point. The spline begins and ends
tangentially with the previous and the following feedrate specification.
If the F address is missing from a block, the last F value to be
programmed is used.
Polynomial path velocity profile:
The F address defines the feed characteristic via a polynomial from the
current value to the block end. The end value is valid thereafter as a
modal value.
Path Traversing Behavior
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