HEIDENHAIN iTNC 530 HSCI - Axis-Error Compensation; Backlash Compensation; Cause Outside of the Control Loop

July 2013 6.4 Axis-error compensation 647
6.4 Axis-error compensation
The iTNC can compensate the following mechanical axis errors:
 Backlash
 Linear axis errors
 Nonlinear axis errors
 Thermal expansion
 Reversal spikes during circular movements
 Friction, stick-slip
 Torsion compensation
Per axis you can activate either the linear or the nonlinear axis error
compensation. All other types of compensation are nonexclusive.
6.4.1 Backlash compensation
Cause outside of
the control loop
During a reversal in axis direction, there is often a little play between the rotary
encoder and table. This play is referred to as backlash.
Positive backlash: The rotary encoder reading is ahead of the table. The table
traverse is too short.
Negative backlash: The rotary encoder reading is behind the table. The table
traverse is too long.