Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 463)

Programming Feedrates
Chapter 18
18-15
To begin and complete a smooth axis motion, the control uses an
exponential function curve to automatically accelerate/decelerate an axis.
The system installer sets the acceleration/deceleration time constant “T”
for each axis in AMP. Figure 18.7 shows axis motion using exponential
Acc/Dec.
Figure 18.7
Exponential Acceleration/Deceleration
Velocity
Time
T T
“F”is the programmed feedrate
“T”is the acceleration/deceleration
time constant
F
18.4.1
Exponential Acc/Dec