Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 457)

Programming Feedrates
Chapter 18
18-9
The maximum cutting feedrate limits the axis feedrate for any move
controlled by a F--word. Feedrate override switch settings that cause the
feedrate to exceed the maximum cutting feedrate will also be accordingly
modified to keep the feedrate below or at the maximum cutting feedrate.
When the feedrate is “clamped” to a value below the programmed feedrate
the control displays a flashing C next to the current axes feedrate. The
displayed axis feedrate is the actual feedrate of the tool, not necessarily the
programmed feedrate.
This feature will cause the servo to maintain a constant torque while
cutting by varying the axis feedrate. The adaptive feed feature is helpful
for machining processes where maintaining a constant feedrate is not as
important as maintaining a constant cutting force. The adaptive feed
feature also allows you to enter a feedrate range to prevent excessively low
or high feedrates.
Your system installer must configure the adaptive feed feature for each
servo using AMP.
When a move is programmed as an adaptive feed move, the control
monitors the control’s torque output being sent to the servo drive. If the
output torque is too low, the control increases the cutting feedrate until the
output torque reaches the programmed torque. If the torque output is too
high, the control decreases the cutting feedrate until the servo output drops
to your programmed torque.
18.2
Feedrates to Control Torque
Adaptive Feed (G25)