
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63783EN-1/01
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If linear acceleration/deceleration not reaching the specified
acceleration occurs as shown above, this function shortens the
acceleration/deceleration time by changing the internal acceleration for
acceleration/deceleration before interpolation and the bell-shaped time
constant in order to generate an acceleration/deceleration pattern as
close as possible to that that permits optimum bell-shaped
acceleration/deceleration before interpolation for the specified speed.
Optimum bell-shaped acceleration/deceleration before interpolation,
as mentioned here, refers to bell-shaped acceleration/deceleration
before interpolation in which if T2 > T1, T1 and T2 are changed to T1'
and T2' as shown in the figure below so that linear
acceleration/deceleration not reaching the specified
acceleration/deceleration does not occur.
Non-linear
acceleration/deceleration
Specified
speed
Speed
T1'
T2' T2'
Fig.7.2.2.1(b)
Methods of specifying the acceleration/deceleration reference speed
The acceleration/deceleration reference speed refers to the feedrate
used as the reference for calculating optimum acceleration. In Fig. 3, it
is equivalent to the specified speed used to determine T1' and T2'.
There are three methods for specifying the acceleration/deceleration
reference speed.
Specifying a value close to the actually specified speed as the
acceleration/deceleration reference speed will be effective.
(1) Specifying the speed using an F in a G05.1 Q1 block
(2) Setting the speed on the High-speed High-precision Machining
Setting Screen
(3) Setting the speed specified with the F command issued at the start
of cutting as the reference speed
NOTE
This function is effective if BCG (No. 1603 bit 6) is 1.