Smoothing The Path Velocity - Siemens SINUMERIK 840DE Programming Manual

Path Action

5.5 Smoothing the path velocity

Example
Dynamic values by technology group G code
DYNNORM G1 X10
DYNPOS G1 X10 Y20 Z30 F...
DYNROUGH G1 X10 Y20 Z30 F10000
DYNSEMIFIN G1 X10 Y20 Z30 F2000
DYNFINISH G1 X10 Y20 Z30 F1000
Write or read specific field element
Maximum acceleration for roughing, axis X
R1=$MA_MAX_AX_ACCEL[2, X]
$MA_MAX_AX_ACCEL[2, X]=5
5.5 Smoothing the path velocity
Function
A smoother path velocity profile can be achieved with the "Path velocity smoothing" function,
which allows special machine data and the character of the parts program to be taken into
account.
The velocity control function utilizes the specified axial dynamic response. If the programmed
feedrate cannot be achieved, the path velocity is brought to the parameterized axial limit
values and the limit values of the path (velocity, acceleration, jerk). This can lead to repeated
braking and acceleration on the path.
Parameters
Machine manufacturer
The following parameters are available to the user via machine data:
• lengthening the machining time
• Input of the natural frequencies of the operated axes
• Taking the programmed feedrate into account.
5-20
The machining time of the part program is specified as percentage. The actual
lengthening is according to the worst case of all acceleration processes inside the part
program and can even be zero.
Only acceleration processes that lead to clear excitation of machine axes should be
removed.
In this case the smoothing factor is observed especially exactly if the override is set to
100%.
;Initial setting
;Positioning mode, tapping
;Roughing
;Finishing
;Smooth-finishing
;Read
;Write
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals