
4.FEED FUNCTION NC FUNCTION B-63942EN/02
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4.9 AUTOMATIC ACCELERATION/DECELERATION
To prevent a shock from occurring on the mechanical system,
acceleration/deceleration is automatically applied to the tool to enable
smooth starting and stopping when the tool starts and ends moving. In
addition, acceleration/deceleration is applied automatically when the
feedrate changes, so that the feedrate can be changed smoothly.
This means that no programming consideration is required for
acceleration/deceleration.
Rapid traverse : Linear acceleration/deceleration (time constant per
axis is set by parameter)
Cutting feed : Exponential acceleration/deceleration (time constant
per axis is set by parameter)
Jog feed : Exponential acceleration/deceleration (time constant
per axis is set by parameter)
Rapid traverse rate
Time
F
R
: Rapid traverse
rate
T
R
: Acceleration/
deceleration
time constant
for rapid
traverse rate
0
F
R
T
R
T
R
F
C
: Cutting feedrate
T
C
: Acceleration/
deceleration time
constant for a cutting
feedrate
Cutting feedrate
0
Time
F
C
T
C
T
C
F
J
T
J
T
J
F
L
0
Jog feedrate
Time
F
J
: Jog feedrate
T
J
: Acceleration/
deceleration time
constant for a jog
feedrate
F
L
: Deceleration stop
feedrate in jog feed