Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 533)

Fixed Cycles
Chapter 25
25-13
This angle is always measured from the axis parallel to the spindle
center-line regardless of whether parallel or tapered threads are being cut.
The angle direction, clockwise or counterclockwise, is always such that it
will increase the root diameter of the thread.
Figure 25.1
Pullout Distance and Angle
Actual programmed end of thread
r 3.5 entered for Pullout Distance, Chamfered Thrd
a
r
a
4.0 entered for Pullout Distance, Chamfered Thrd
Actual programmed end of thread
16 degrees entered for Pullout Angle, Chamfered Thrd
30 degrees entered for Pullout Angle, Chamfered Thrd
Axis Parameter
Number
All [73]
Range
0.0 to 89.0 degrees
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 retract and threading chamfer features, enter a
value of zero for this parameter.