Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 531)

Fixed Cycles
Chapter 25
25-11
If a value has been set for this and the “Pullout Angle, Chamfered Thrd”
parameters, and the PAL flag $FCPULL has been set true, then the control
automatically cuts a chamfer at the end of each threading pass during the
operation of the threading cycles. This also lets you abort a threading pass
and cut a chamfer out of the thread when the button
is pressed.
Refer to your programming and operation manual for details on
threading chamfer.
Enter in this parameter the number of threads that are to be chamfered.
This determines the length of the chamfer as a function of the thread lead.
The resolution of this parameter is in 1/10th of a thread increments. The
angle for this chamfer is determined by the Pullout Angle, Chamfered
Thread parameter. Refer to Figure 25.1 for an application example.
Axis Parameter
Number
All [74]
Range
0.0 to 50.0 threads
Notes
This is a global parameter; the value set here applies to all axes
and processes.
This parameter may also be changed on the control by using the
fixed-cycle parameter table.
To disable the threading chamfer features enter a value of zero for this
parameter.