
PROGRAMMING
B–63534EN/02
22. RISC PROCESSOR
617
Deceleration to
500 mm/min
Deceleration to
354 mm/min
(Example)
If parameter FNW (bit 6 of No. 19500) = 0 and the
permissible feedrate difference = 500 mm/min (on all axes)
If “1” is set, the feedrate is determined not only with the condition that the
permissible feedrate difference and permissible acceleration on each axis
are not exceeded, but also that the deceleration feedrate is constant
regardless of the travel direction if the shape is the same.
If 1 is set for this parameter, the deceleration feedrate determined with the
feedrate difference or acceleration may be up to 30% lower than that
determined if 0 is set.
Deceleration to
354 mm/min
(Example)
If parameter FNW (bit 6 of No. 19500) = 1 and
permissible feedrate difference = 500 mm/min (on all axes)
Deceleration to
354 mm/min
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. 8470.
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.
In the following example, the acceleration (gradient of the broken line in
the feedrate graph) at too large at corners N2 to N4 and N6 to N8 and,
therefore, deceleration is performed.
Example of determining
the feedrate with the
acceleration on each
axis
D Example