© Siemens AG All rights reserved. SINUMERIK, Manual, 5-axis machining
Key functions for 5-axis machining
3.6
71
Programming
FFWON/
FFWOF
BRISK
SOFT
.
.
Feedforward control.
In cases where axes are not feedforward-con-
trolled, the following error results in a contour
error whose severity is determined by the
velocity. . Generally, this will manifest itself
in the form of a narrowing of the radius on
curved contours. The following error depends
on the servo gain factor that is set (dependent
on mechanics) and the axis velocity.
The FFWON feedforward control function
brings the velocity-dependent following error
down towards zero during path traversal. Tra-
versing with feedforward control permits
higher path accuracy and thus improved
machining results.
.
. .
Recommendations
CYCLE832 includes the following combina-
tions:
.
FFWON SOFT
The emphasis is on a high path accuracy. This
is achieved using a soft form of velocity control
that is essentially free from following errors.
FFWOF SOFT
The priority is not on achieving a high path
accuracy.
Additional rounding is achieved by means of
following errors. For use with older part pro-
grams/machines.
FFWON BRISK
Not recommended
FFWOF BRISK
For use when roughing and when maximum
velocity is required.
1
3
2
1
3
Feedforward
control
Acceleration
Without
following error/
tolerance
With
following error/
tolerance
High
acceleration
Gentle
acceleration
FFWON
FFWOF
BRISK
SOFT
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