
B–63503EN–1/01
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
315
A specified cutting feedrate can be linearly increased or decreased before
interpolation. This function eliminates machining profile errors caused
by the delay occurring in acceleration or deceleration. The time required
for acceleration or deceleration by this function is significantly shorter
than that by the function of exponential acceleration/deceleration.
CNC command
Servo control
Servo motor
Feedrate
Speed
Time
F
F
Feedrate
command
Move data
F: Value of feedrate command
Pulse
distribution
(interpolation)
Servo control
Linear accel-
eration/decel-
eration before
interpolation
The function of linear acceleration/deceleration before interpolation in-
creases or decreases the feedrate specified in the tangential direction.
If the feedrate command is changed
D Type A
Acceleration/deceleration is started in the block in which a new feedrate
command is specified.
D Type B (Set the FWB bit (bit 0 of parameter No. 1602) to 1.)
Deceleration: Deceleration is started in a prior block such that decelera-
tion is completed before the beginning of the block in
which a new feedrate command is specified.
Acceleration: Acceleration is started in the block in which a new fee-
drate command is specified.
7.2.4
Linear Acceleration/
Deceleration before
Cutting Feed
Interpolation
(Look–ahead Control)
General