Ascertain The Load (Cycle 239, Din/Iso: G239, Software Option 143); Cycle Run - HEIDENHAIN TNC 640 User Manual

Cycles: Special Functions | ASCERTAIN THE LOAD (Cycle 239, DIN/ISO: G239, software option 143)
11.10 ASCERTAIN THE LOAD (Cycle 239, DIN/
ISO: G239, software option 143)

Cycle run

The dynamic behavior of your machine may vary with different
workpiece weights acting on the machine table. A change in the
load has an influence on the friction forces, acceleration, holding
torque and stick-slip friction of table axes. With option 143 LAC
(Load Adaptive Control) and Cycle 239 ASCERTAIN THE LOAD, the
control can automatically determine and adjust the current load
mass, the current frictional forces and maximum axis acceleration,
and reset the feedforward and controller parameters. In this way,
you can optimally react to major load changes. The TNC performs
a weighing procedure to ascertain the weight acting on the axes.
The axes traverse a specific path with this weighing procedure—
the machine tool builder defines the precise movements. Before
weighing, the axes are moved to a position, if required, where
there is no danger of collision during the weighing procedure. This
safe position is defined by the machine tool builder.
In addition to adjusting the control parameters, with LAC the
maximum acceleration is also adjusted in accordance with the
weight. This enables the dynamics to be accordingly increased with
low load to increase productivity.
Parameter Q570 = 0
1 There is no physical movement of the axes.
2 The TNC resets the LAC.
3 The TNC activates feedforward parameters and, if applicable,
controller parameters that ensure a safe movement of the axes
concerned, regardless of the load condition—the parameters
set with Q570=0 are independent
4 These parameters can be useful during the setup procedure or
after the completion of an NC program.
Parameter Q570 = 1
1 The TNC performs a weighing procedure in which it moves one
or more axes. Which axes are moved depends on the setup of
the machine and on the drives of the axes.
2 The scope of axis movement is defined by the machine tool
builder.
3 The feedforward and controller parameters determined by the
TNC depend on the current load.
4 The TNC activates the parameters determined.
HEIDENHAIN | User's manual for cycle programming | 10/2017
of the current load.
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