Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 353)

Chapter 11
Coordinate Control
11-37
Your system installer selects values that represent a maximum and a
minimum value in the form of coordinate values for each axis. These
coordinate values define points on the machine coordinate system. The
axes are then not allowed to move past the coordinate value representing
the maximum and minimum value on each axis. This limited range of
motion is referred to as the software overtravels.
Figure 11.21
Area Defining Software Overtravel
Max X
value
Min X
value
Min Z
value
Max Z
value
Software overtravel area as defined in AMP by
minimum and maximum axis values
Machine
coordinate
zero
X
Z
12103-I
Typically the software overtravels are located within the hardware
overtravels (maximum axis travel defined by the limit switches on each
axis) and are used to keep the axes within the range your system installer
determines is usable for that particular machine’s application.
The area defined by the software overtravels becomes effective after
completion of the initial homing operation at power-up. For details on
how the control reacts to a entry into an overtravel area, see page 11-43.
ATTENTION: The area defined by a software overtravel does
not take into account any wheel length or radius offsets. This
may allow the grinding wheel to enter a restricted area without
the axes entering it. Make sure this is considered when
programming motions with wheel offsets active.