Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 465)

Programming Feedrates
Chapter 18
18-17
When S--Curve Acc/Dec is enabled, the control changes the velocity
profile to have an S--Curve shape during acceleration and deceleration
when in Positioning or Exact Stop mode. This feature reduces the
machine’s axis shock and vibration for the commanded feedrates.
Figure 18.9 shows axis motion using S--Curve Acc/Dec.
Figure 18.9
S- Curve Acc/Dec
Acceleration
Ramp
Jerk
Time (sec)
Time (sec)
Acceleration
Jerk
Time (sec)
Ve
lo
c
ity
S--Curve
Deceleration
Jerk
Commanded
Feedrate
S--Curve
Acceleration
Linear
Acc Linear
Dec
Jerk Jerk
Jerk
18.4.3
S- Curve Acc/Dec