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

9.5

Feedrate response (FNORM, FLIN, FCUB, FPO)

9.5
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.
Programming
F... FNORM
or
F... FLIN
or
F... FCUB
or
F=FPO(...,...,...)
Parameters
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.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
9.5 Feedrate response (FNORM, FLIN, FCUB, FPO)
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.
Path traversing behavior
9-37