
B--63003EN--1/02
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
653
NOTE
1 If bell -- shaped acceleration/deceleration after interpolation
during cutting feed is enabled, bell--shaped acceleration/
deceleration is executed during cutting feed and during a
dry run. Bell--shaped acceleration/deceleration can also be
executed during jog feed if the JGL bit (bit 4 of parameter
No. 1610) is specified accordingly.
2 In circular interpolation, the actual tool path after
acceleration/deceleration deviates from the programmed
arc in the radial direction. To overcome this radial deviation,
see the note on linear acceleration/deceleration after
interpolation for cutting feed in Subsection 7.2.3.
3 Bell--shaped acceleration/deceleration can be executed
both for cutting feed and for jog feed along a PMC axis. The
time constant for accelera tion/deceleration for jog feed is
the same as that for cutting feed. In jog feed along the PMC
axis, the time constant for cutting feed is used instead of that
for jog feed.
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 c ommand
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
Note
7.2.5
Linear Acceleration/
Deceleration before
Cutting Feed
Interpolation
General