January 2012 6.10 Axis Error Compensation 713
6.10.3 Nonlinear axis error compensation
Depending on the design of the machine, production tolerances, or external
factors (e.g. temperature), a nonlinear axis-error can occur. Typical errors are
screw-pitch errors and axis sag.
These graphics show typical nonlinear axis errors:
The best way to measure nonlinear axis error is with a comparator measuring
system such as the HEIDENHAIN VM 101.
Nonlinear axis error compensation is also effective for an open loop. In this
case the compensation value is considered when the control loop is closed.
The control can compensate screw-pitch error and axis sag simultaneously.
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