Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 534)

Fixed Cycles
Chapter 25
25-14
Function
This parameter is for lathe controls that use multiple pass threading cycle,
G-codes:
System G Code
A G76
B G76
C G78
This parameter enables the setting of the smallest amount of material that
may be cut during the multiple pass threading cycle. The control
automatically generates the infeed for each cutting pass for this cycle.
If the generated depth of cut is smaller than the value entered for this
parameter, the control will infeed an amount equal to the parameter value.
Axis Parameter
Number
All [111]
Range
0.00000 to 9999.90000 mm
or
0.00000 to 393.69685 inch
Notes
This is a global parameter; the value set here applies to all axes
and processes.
The control will not infeed the cutting tool less than the value set for this
parameter when executing a multi-pass threading cycle. The control looks
ahead as many blocks as is necessary to prevent its having to execute a
block that is less than this value. The depth of other cuts can be made
smaller to compensate for later cuts.
25.9.3
Min Infeed in Multi
Threading