Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 577)

Cylindrical/Virtual C Parameters
Chapter 30
30-13
Function
This parameter specifies whether the tool is positioned along the feed axis
nearest to machine zero or farthest from machine zero of the cylindrical
workpiece. This parameter provides the option of cutting the contour on
either side of the cylindrical workpiece.
Parameter Parameter Number
Single Process Process 1 Process 2
Feed Axis Park Location [242] [20242] [21242]
Range
Selection Result
(a) Nearest To Machine Zero
(b) Farthest From Machine Zero
Notes
This parameter is used for mill and lathe controls.
For dual--processing controls, this is a per process parameter. The value set
in the parameters applies to all of the axes assigned to that process.
This feature is not available on the 9/230 control.
Function
Important: This parameter and the discussion included here assumes that
the lathe spindle has been defined to be the virtual C axis for your
machine. If this is not the case, ignore the discussion here and set this
parameter to “NO.”
This parameter specifies whether an automatic spindle homing operation is
to be performed by the control when the virtual C feature is activated. Just
before the first move is performed in the virtual C mode, the control sets
the current spindle location to angle zero.
For some applications the location of this zero point is not significant and
may be defined as any location in the 360 degree rotation of the spindle.
However, for applications requiring that the contour be cut at a specific
orientation of the part, it is necessary that this zero point be accurately
defined and repeatable.
30.14
Feed Axis Park Location
30.15
Automatic Home on Virtual
C Entry