HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 459)

Unbalance functions (Option #50) 14.3
14
TNC 640 | User's ManualDIN/ISO Programming | 1/2015
459
The rotation of the workpiece creates centrifugal
forces that can cause vibration (resonance),
depending on the unbalance. This vibration has
a negative effect on the machining process and
reduces the tool life. High centrifugal forces can
damage the machine or push the workpiece out of
the fixture.
Check the unbalance whenever you clamp a new
workpiece. If required, use balancing weights to
compensate any unbalance.
The removal of material during machining will change
the mass distribution within the workpiece. This
may also have an influence on workpiece unbalance.
Therefore, unbalance checks should also be carried
out between machining steps.
Keep in mind the mass and unbalance of the
workpiece when choosing the speed. Do not
use high speeds with heavy workpieces or high
unbalance loads.
Unbalance Monitor function
The Unbalance Monitor function monitors the unbalance of a
workpiece in Turning mode. If a maximum unbalance limit specified
by the machine manufacturer is exceeded, the TNC issues an error
message and initiates an emergency stop. In addition, you can
further decrease the permissible unbalance limit by setting the
machine parameter
limitUnbalanceUsr. If this limit is exceeded,
the TNC will display an error message, The table rotation is
not stopped in this case. The TNC automatically activates the
Unbalance Monitor function when you switch to Turning mode.
The unbalance monitor is effective until you switch back to Milling
mode.