
B-63323EN-1/03 7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL
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NOTE
The method of deceleration with the feedrate
difference differs depending on the setting of
parameter FNW (bit 6 of No. 1517). For details,
refer to the section on " Look-ahead acceleration/
deceleration before interpolation " in this manual.
Example of determining the feedrate with the acceleration on each axis
When consecutive small lines are used to form a curve, as in the
example shown in the figure below, the feedrate differences on each
axis at the individual corners are not very large. Thus, deceleration with
the feedrate differences is not effective. Consecutive small feedrate
differences, however, cause a large acceleration on each axis, as a
whole.
In such a case, deceleration can be performed to reduce the impact on
the machine and the machining error caused by too large an
acceleration. The deceleration feedrate is determined to be the feedrate
that does not cause the acceleration on each axis to exceed the
permissible acceleration set for parameter No. 1663.
The deceleration feedrate is determined for each corner. The actual
feedrate is the smaller of the deceleration feedrate determined at the
start point of the block and that determined at the end point.