
B-65270EN/05 3. αiS/αiF/βiS SERIES PARAMETER ADJUSTMENT
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The following figure shows the effect of the feed-forward function.
The figure indicates that an arc radius error of 250 µm, which was
measured before the use of the feed-forward function, has been
reduced to almost 0 after the use of the feed-forward function.
Feed-forward coefficient 0% Feed-forward coefficient 100%
Radius error is about
250 µm
Radius error is
almost 0 µm
(b) Adjusting the feed-forward coefficient
The feed-forward coefficient can be adjusted on the screen shown
below. Note that, however, setting the feed-forward coefficient to
more than 10000 (100%) means that the actual machine position
advances ahead of commands from the CNC. So, such setting is not
permitted.
[Parameter window main screen] [Contour error suppression + feed-forward]
While checking fluctuation of radius by using an arc with about
R10/F4000 or R100/F10000 set, make an adjustment so that the actual
path matches the commanded path. At this time set the velocity
feed-forward coefficient to about 100.
NOTE
To fine-tune the amount of arc radius, also adjust
the feed-forward timing parameter after adjusting
the feed-forward coefficient. (See Subsection
4.6.5.)