February 2012 10 – 111
10.5.3 Finding compensation values
To improve the positioning accuracy of machine tools, the machine tool builder can choose from a
variety of compensation possibilities the iTNC 530 HSCI offers:
Backlash compensation
Linear axis error compensation
Nonlinear axis error compensation
Compensation of thermal expansion
Compensation of reversal spikes during circular traverse
Compensation of static friction
Compensation of sliding friction
Torsion compensation
All selected and activated compensations are combined and transferred to the position controller.
Example:
You have replaced a position encoder. According to the instructions of the machine tool builder, the
components must be switched off, before the machine datum can be reset.
With the integrated oscilloscope, you can find out whether or not compensations are still active.
8 For example, set the oscilloscope like this:
8 Start the oscilloscope recording.
8 Traverse the axis concerned at low speed.
8 Stop recording and adjust the display.
8 Traverse the axis again wit the adjusted display.
Compensation values are not noticeable to the operator.
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