
B-63944EN/02 PROGRAMMING 19.HIGH-SPEED CUTTING FUNCTIONS
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The method of determining the feedrate with the acceleration differs
depending on the setting of parameter FNW (bit 6 of No. 19500).
If "0" is set, the highest feedrate that does not cause the permissible
acceleration set for parameter No. 1737 to be exceeded is assumed to
be the deceleration feedrate. In this case, the deceleration feedrate
differs depending on the travel direction even if the shape is the same,
as shown in the figure below.
(Example) If a circular shape with a radius of 10 mm is specified with small
line blocks
Parameter FNW (bit 6 of No. 19500) = 0
Permissible acceleration = 1000 mm/s
2
(on all axes)
The feedrate is
higher in these
directions.
Tangent feedrate
Time
F6000
If "1" is set, the feedrate is determined with not only the condition that
the permissible acceleration on each axis is not exceeded but also the
condition 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.
(Example) If a circular shape with a radius of 10 mm is specified with small
line blocks
Parameter FNW (bit 6 of No. 19500) = 1,
radius = 10 mm, permissible acceleration = 1000 mm/s
2
(on all axes)
The tangent
feedrate is
constant.
Tangent feedrate
Time
F6000
NOTE
In circular interpolation, the tangent feedrate is
constant regardless of the setting of the parameter.