HEIDENHAIN TNC 640 (34059x-05) - Manual (Page 494)

Programming: Turning Operations
14.3 Unbalance functions (Option #50)
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 1/2015
14.3 Unbalance functions (Option #50)
Unbalance while turning
General information
The machine has to have been adapted by the
machine manufacturer for monitoring and measuring
unbalance. The unbalance functions are not required
some machine types. These functions might not be
available on your machine. Refer to your machine
manual.
The unbalance functions described here are basic
functions that are set up and adapted to the machine
by the machine manufacturer. The scope and effect
of the described functions may therefore vary from
machine to machine. The machine manufacturer may
also provide different unbalance functions. Refer to
your machine manual.
In a turning operation, the tool is in a fixed position, whereas the
rotary table and the clamped workpiece rotate. Depending on the
size of the workpiece, the mass that is set in rotation can be very
large. As the workpiece rotates, it creates an outward centrifugal
force.
The centrifugal force that occurs basically depends on the
rotational speed, the mass and the unbalance of the workpiece. An
unbalance occurs if an object with a rotationally nonsymmetrical
mass distribution is set in rotation. The rotation of the mass object
creates outward-directed centrifugal forces. If the rotating mass is
evenly distributed, the centrifugal forces cancel each other out.
Unbalance is significantly influenced by the structural shape of the
workpiece (e.g. nonsymmetrical pump body) and by the chucking
equipment. As these factors frequently cannot be changed, you
should compensate any existing unbalance by means of balancing
weights. The TNC provides the
MEASURE UNBALANCE cycle for
this purpose. The cycle determines the existing unbalance and
calculates the mass and position of the required balancing weight.