Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 414)

Letter Format Parameters
Chapter 17
17-16
Function
This parameter specifies the Q-word for threading blocks. It provides a
relative value for the start offset angle of the thread. Its primary use is in
cutting multi-start threads.
This parameter specifies the maximum number of digits that are permitted
to the left and to the right of the decimal point in the Q-word format.
Parameter Parameter
Number
Q: Thread Marker Angle Shift [485]
Range
Selection Result
(a) 3.0 degrees
(b) 3.1 degrees
(c) 3.2 degrees
Notes
These are global parameters. The values entered here apply to all axes
and processes.
17.21
Q: Thread Marker Angle
Shift