HEIDENHAIN TNC 640 (34059x-01) - Manual (Page 435)

HEIDENHAIN TNC 640 435
13.3 Unbalance F
unctions
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, but the table rotation will not be stopped.
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.
Measure Unbalance cycle
To ensure maximum safety and minimum strain on the machine and
workpiece during turning, you should check the unbalance of the
clamped workpiece and compensate it with a balancing weight. The
TNC provides the Measure Unbalance cycle for this purpose. The
Measure Unbalance cycle determines the unbalance of the workpiece
and calculates the mass and position of a balancing weight.
To determine unbalance:
U Shift the soft-key row in the Manual Operation mode
U Select the MANUAL CYCLES soft key
U Select the TURNING soft key
U Select the MEASURE UNBALANCE soft key
U Enter the speed for unbalance detection
U Press the NC Start button: The cycle starts rotating
the table at a low speed and gradually increases the
speed up to the defined value. The TNC displays a
window that shows the calculated mass and radial
position of the balancing weight.
If you wish to use a different radial position or mass for the balancing
weight, you can overwrite one value and have the other value
recalculated automatically.
Repeat the unbalance measurement after you have
clamped a balancing weight.
In some cases, you may need to place two or more
balancing weights at different positions in order to
compensate unbalance.