HEIDENHAIN TNC 620 User Manual page 568

16
Test Run and Program Run
16.5 Program run
Danger of collision!
For nonreferenced axes, the TNC adopts the most
recently saved axis values. Generally, these values do
not correspond to the exact actual axis positions!
As a result, for example, the TNC might not move
the tool exactly along the actual 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 a workpiece or tool can also
be caused by uncontrolled coasting or braking of
axes after a power failure. If the tool is still in contact
with the workpiece, move the axes carefully. Set the
feed rate override to the small values. If you use the
handwheel, use a small feed rate factor.
The traverse range monitoring is not available for
nonreferenced axes. Watch the axes while you are
moving them. Do not move to the limits of traverse.
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HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015