Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 480)

Angled-Wheel Grinding
Chapter 14
14-12
This section covers how axis position registers are presented on the
operator panel. Some screens will show a combination of the following
axis position registers:
Z (real) -- This is the physical position of the grinding wheel along the Z
axis slide relative to a fixed position. This does not change with W axis
motion.
Z (virtual) -- This is the position of the grinding wheel along the Z axis
relative to a fixed position on the machine which is not on the Z axis
slide. This position is changed by W axis motion. Note that in the
G16.4 mode the Z (real) position will not change during the W move
because the Z axis attains its real endpoint in a separate move. The Z
(virtual) position changes during both steps one and step two in G16.4
mode.
W (real) -- This is the physical position of the grinding wheel along the
W axis slide relative to a fixed position. There is no W (virtual) display.
X (virtual) -- this is a virtual diameter axis. It is orthogonal to the Z axis
of the machine. There is no physical hardware that makes up an X axis
so there is no X (real) position display.
Other Axes (real) -- All other axes selected to appear on position
displays will be the actual physical position along their respective axis
slide.
The Z and W axis display remains on all screens regardless of whether in
angled-wheel mode or not. The X axis position display only appears when
in one of the angled wheel modes. The position displays when in angled
wheel mode are as shown in the following table:
This Position
Display:
Absolute Programmed Target DTG Following Error
Shows these Axis
Positions: Z (real) Z (virtual) Z (virtual) Z (virtual) Z (real)
Positions:
X (virtual) X (virtual) X (virtual) X (virtual) --
W (real) W (real) W (real) W (real) W (real)
Other Axes Other Axes Other Axes Other Axes Other Axes
Note: The word (real) and (virtual) do not physically appear with the axis position displays. They are shown
here for clarity only.
When not in angled-wheel mode (G15) all position displays show (real)
values. There is no X (virtual) or Z (virtual) in G15 mode.
14.4
Position Displays for
Angled-Wheel Grinders