Siemens SINUMERIK 840D sl Function Manual page 418

Compensations (K3)
Friction compensation (quadrant error compensation)
Amplitude too low
When the injection amplitude setting is too low, radius deviations from the programmed
radius are compensated inadequately at quadrant transitions during circularity testing.
Figure 5-22
Amplitude too high
When the injection amplitude setting is too high, radius deviations at quadrant transitions are
manifestly overcompensated at quadrant transitions.
Figure 5-23
418
Amplitude too low
Amplitude too high
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions