
B-63783EN-1/01 7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL
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#7 #6 #5 #4 #3 #2 #1 #0
1517 FNW
[Input type] Parameter input
[Data type] Bit
# 6
# 6 # 6
# 6 FNW
FNWFNW
FNW Specifies whether the method of determining the feedrate based on the
feedrate difference in look-ahead acceleration/deceleration before
interpolation and the method of determining the feedrate based on the
acceleration of fine HPCC.
0: The highest feedrate that does not exceed the allowable feedrate difference or
allowable acceleration for each axis is assumed.
1: In addition to the condition that the feedrate must not exceed the allowable
feedrate difference and allowable acceleration, the condition that the
deceleration feedrate must be constant if the geometry is the same must be
satisfied in determining the feedrate.
When this parameter is set to 1, the feedrate determined with the feedrate
difference or acceleration may be lower by up to 30% than that determined when it
is set to 0.
1663 Allowable acceleration in the deceleration function based on the acceleration
for each axis of fine HPCC
[Input type] Parameter input
[Data type] Realaxis
[Unit of data] mm/sec/sec, inch/sec/sec, degree/sec/sec (machine unit)
[Minimum unit of data] Depend on the increment system of the applied axis
[Valid data range] Refer to the standard parameter setting table (D)
(When the machine system is metric system, 0.0 - +100000.0. When the
machine system is inch system, machine, 0.0 - +10000.0)
Specify the allowable acceleration that may occur due to changes in the direction of
tool travel.
For an axis for which this parameter is set to 0, the deceleration function based on
the acceleration is disabled. If 0 is set for all axes, the feedrate is not determined
based on the acceleration.
In the 15B, the time for the maximum cutting rate (parameter No. 1422) was set
for parameter No. 1643 to set the allowable acceleration. In the 15i, on the other
hand, the acceleration is directly specified for this parameter.
NOTE
During involute interpolation, the allowable acceleration for the
"acceleration clamp in the vicinity of the basic circle" of involute
interpolation automatic feedrate control is applied.