Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 327)

Constant Surface Speed
Chapter 11
11-5
Function
When a rapid move (or many consecutive rapid moves) takes place if CSS
is active, undesirable results may occur when the rotating part attempts to
increase or decrease rpm rapidly as the tool moves. This parameter allows
the option of the spindle speed being calculated based on the programmed
end-point instead of the continuously changing position of the CSS axis.
Programmed End Point -- When you select Programmed End Point, this
causes any rpm changes to be calculated based on the end-point of a rapid
move.
Momentary Position -- When you select Momentary Position, this causes
any rpm changes that take place for rapid moves to be executed as the axis
moves. This is the same as though the move was a regular axis move using
the programmed feedrate.
Axis Parameter Number
Single Process Process 1 Process 2
All [854] [20854] [21854]
Range
Selection Result
(a) Programmed End Point
(b) Momentary Position
Notes
This is a global parameter. The value set here applies to all axes.
For Dual Processing controls, this is a per process parameter. The value set
in the parameters applies to all of the axes assigned to that process.
This parameter has no effect on moves that are executed at the
programmed feedrate.
11.4
CSS Radius During G00
Rapid