Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 418)

Spindles
Chapter 17
17-20
End face milling coordinates the motion of the virtual C axis with that of
the linear machine axes to machine contours on the end face of a
workpiece as shown in Figure 17.5. Virtual C axis end face milling is
turned on using a G16.2 block and turned off with a G15 block (or a G16.1
block requesting cylindrical interpolation). A G15 block can not contain
any axis words.
Figure 17.5
Virtual C Axis End Face Milling
Y (simulated)
X
C
Lathe Live Tool
N2
N3 N4
N5 N6
The following are not allowed during end face milling:
Automatic motion to and from home G27, G28, G29, or G30
Work coordinate changes and shifts G53, G54-G59, G59.1, G59.2,
G59.3, G50/G92, G52, G92.1
All Turning and Threading cycles
All Drilling, Tapping, and Boring cycles
For ease of programming and to help the programmer visualize contours, a
simulated axis (end face milling axis) perpendicular to the X axis is
utilized with this feature. This axis name, its incremental axis name (if
Lathe Type A), and its integrand name are defined in AMP. This
description assumes that those names are Y, V, and J respectively. Refer to
the literature provided by your system installer for specific information.
17.5.2
Virtual C Axis,
End Face Milling