Temperature compensation

Deformation

The change of temperature causes expansions or reductions of machine parts.

Effect

The deformation results in a shifting of axes positions. These shiftings are not detected by the installed position measuring system of the machine and they lead to inaccuracy of the manufactured work pieces.

Temperature compensation 1:
Figure 1-7: Temperature dependend falsification of axis position

Compensation

The temperature compensation is a method to correct the reference variable of the axis dependent on the current temperature and axis position.

The correction values are calculated with following relation:

Temperature compensation 2:

with:

Temperature compensation 3: Current position of the axis

Temperature compensation 4: Current reference temperature

Temperature compensation 5: Reference position of the axis

Temperature compensation 6: Temperature-dependent deviation at the reference position

Temperature compensation 7: Temperature-dependent ratio of deviation and the distance to the reference position

Temperature compensation 8:
Figure 1-8: Parameter of the temperature compensation for a temperature T
Further Information