Feedrate Response (Fnorm, Flin, Fcub, Fpo) - Siemens Sinumerik 840D sl Programming Manual

Path traversing behavior

8.2 Feedrate response (FNORM, FLIN, FCUB, FPO)

8.2 Feedrate response (FNORM, FLIN, FCUB, 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.
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(...,...,...)
Significance
FNORM
FLIN
FCUB
F=FPO...
Feed optimization on curved path sections
Feed polynomial F=FPO and feed spline FCUB should always be traversed at constant
cutting rate CFC, thereby allowing a jerk-free setpoint feed profile to be generated. This
enables creation of a continuous acceleration setpoint feed profile.
470
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.
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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