Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 786)

Chapter 30
Using a 9/Series Dual--processing System
30-18
CAUTION: The distance between the boundaries before a
collision is detected is dependant upon factors such as:
speed of the axes
direction of axis travel with relationship to one another
For example, a programmed collision between two axes
traveling at rapid directly towards one another may not be
detected in time to fully stop the axes before some overlap of
the interference boundary occurs. Make your boundary areas as
large as possible (definitely larger than the actual physical
dimensions of the protected fixture) to allow for this potential
overlap condition.
Only two axes can be entered in an interference table (available axes are
configured in AMP). To prevent a collision, other axes must rely on
protection by this interference area, or depend on you to use extra care
when programming or manually positioning the axes to prevent a collision.
Figure 30.6
Protecting Additional Axes with Interference Checking
Process 2
Process 1
Though only X and Z define this interference area,
some protection is also offered to avoid YV collisions since an
X or Z collision would be detected anytime Y would collide.
This protection, however, will cause the control to detect a
collision even if sufficient clearance exists on the X or Z axis.
Disable interference checking when it is necessary to overlap
a third axis.
No limits
for the Y
axis
V
W
Y
X
Z
U