HEIDENHAIN TNC 620 User Manual page 579

16
Program run 16.5
Danger of collision!
The TNC uses the last stored axis values for
undefined axes. These axis values may not exactly
correspond with the actual axis positions!
Consequently, the TNC may be unable to move the
tool exactly along the actual tool direction when
moving forward in the tool direction. If the tool is still
in contact with the workpiece, it can cause stress
or damage to the tool and workpiece. Stress or
damage to the workpiece or tool can also be caused
by uncontrolled coasting or braking of axes after a
power interruption. If the tool is still in contact with
the workpiece, move the axes carefully. Set the feed
rate override to the smallest values possible. If you
use the handwheel, use a small feed rate factor.
The traverse mode monitoring mode is not available
for undefined axes. Watch the axes while you are
moving them. Do not move to the traverse mode
limits.
579
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016