Siemens SINUMERIK 840D sl Function Manual page 395

The neural network can reproduce a compensation curve of much better quality and
precision.
The function also allows simple automatic re-optimization directly at the machine.
Circularity test
The friction compensation function (both conventional and neural friction compensation) can
be commissioned most easily by means of a circularity test. This is done by following a
circular contour, measuring the actual position and representing the deviations from the
programmed radius (especially at the quadrant transition points) graphically. The
measurements are recorded using a "Trace" that is stored in the passive file system.
The circularity test is a "commissioning tool" function and can also be selected in the
Commissioning area of the HMI operator interface. For further information, refer to Section
"Circularity test".
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
5.6 Friction compensation (quadrant error compensation)
Compensations (K3)
395