Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 435)

Programming Feedrates
Chapter 18
18-9
Important: Single-digit feedrates are always entered as per minute
feedrates (IPM or MMPM) regardless of the control’s current feedrate
mode. When a single-digit feedrate is programmed, the control
automatically switches to the IPM or MMPM mode. The control
automatically switches back to the previously active feedrate mode when
the next feedrate is programmed that is not a single-digit feedrate.
If there are no feedrates set in the tables that correspond to F1-F9. The
control treats F1-F9 as commanded feedrates.
Single-digit F-word feedrates are affected by the setting of the
switch as regular feedrates. Blocks that are
programmed to move at the rapid feedrate are still executed in the rapid
mode.
Important: A programmed F0 corresponds to the maximum cutting
feedrate (not normally the rapid feedrate) set in AMP by your system
installer. F0 generates an error if the feature is not used.
When you call a single-digit F-word, the F-word must be programmed
with no decimal point and a single digit. For example, F1 calls an assigned
feedrate correlating to the value set as feedrate 1. Designating F1. in a
program assigns a feedrate of 1 in the current feedrate mode.
Your system installer can install an optional external deceleration switch.
Typically this is a mechanical switch mounted on the machine axes inside
the hardware overtravel switches. Refer to documentation prepared by
your system installer for details on the application and location of this
switch.
When you activate this feature, any axis moves that are to take place at a
cutting feedrate (G01, G02, G03, etc.) use a special feedrate assigned in
AMP. Any axis moves that are to take place at a rapid feedrate (G00, etc.)
also uses a special feedrate assigned in AMP. These feedrates are
independent of each other and typically have different values. These
feedrate changes take place immediately when the feature becomes active,
even if this is in the middle of block execution.
Important: The feedrate set for the external deceleration feature for
cutting moves cannot exceed the maximum cutting feedrate.
18.2.2
External Deceleration
Feedrate Switch