Feedrate Characteristic (Fnorm, Flin, Fcub, Fpo) - Siemens SINUMERIK 840D sl Programming Manual

Path traversing behavior

10.2 Feedrate characteristic (FNORM, FLIN, FCUB, FPO)

10.2 Feedrate characteristic (FNORM, FLIN, FCUB, FPO)
Function
To permit flexible definition of the feed characteristic, the feed programming according to
DIN 66025 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.
These additional characteristics make it possible to program continuously smooth velocity
characteristics depending on the curvature of the workpiece to be machined.
Syntax
F... FNORM
F... FLIN
F... FCUB
F=FPO(...,...,...)
Meaning
FNORM
FLIN
FCUB
F=FPO...
Feed optimization on curved path sections
Feed polynomial
cutting rate
enables creation of a continuous acceleration setpoint feed profile.
452
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. The response can be combined with G93 and G94.
Path velocity profile cubic:
The blockwise programmed F values (relative to the end of the block) are
connected by a spline. The spline begins and ends tangentially with the
previous and following defined feedrate and takes effect with G93 and G94.
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.
and feed spline
F=FPO
, thereby allowing a jerk-free setpoint feed profile to be generated. This
CFC
should always be traversed at constant
FCUB
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
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