
B–63523EN–1/03
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
866
tb tb tb tb
ta ta
tc tc
Feedrate
Linear acceleration/deceleration
Bell–shaped acceleration/deceleration
ta: Depends on linear acceleration/deceleration.
tb: Bell–shaped time constant
tc: Bell–shaped acceleration/deceleration time
tc = ta + tb
ta is not constant, but varies with the rapid
traverse rate and rapid traverse time
constant of a specified axis.
tb is determined by an axis.
Time
Let F be a feedrate for movement, let A be acceleration when linear
acceleration/deceleration is assumed, and let T be the time constant of
bell–shaped acceleration/deceleration. Then, time required for
acceleration/deceleration is as follows:
Time required for acceleration/deceleration = F/A (linear type)
= F/A + T (bell–shaped type)
F
T/2 T/2
F/A
TT
Feedrate
F/A: Time required for accel-
eration when linear ac-
celeration/deceleration is
assumed
T: Time required for a
rounded corner
When non–linear interpolation is used, the tool moves according to the
feedrate set in parameter No. 1420 and the acceleration/deceleration set
in parameter No. 1620. By setting parameter No. 1621, bell–shaped
acceleration/deceleration can be selected. (To select bell–shaped
acceleration/deceleration, the option for rapid traverse bell–shaped
acceleration/deceleration is required.)
NOTE
1 Overlapping between rapid traverse blocks is disabled.
2 To use bell–shaped acceleration/deceleration, the option
for rapid traverse bell–shaped acceleration/deceleration is
required.
3 When AI nano contour control is used, non–linear
interpolation cannot be selected.