Today, as the demand for large parts increases, accordingly large machine tools have got greater importance; a clear example is the production of wind turbines, which are growing in size in each new model. Thermal distortion is one of the principal factors among those that limit positioning accuracy in large machines. Therefore measuring thermal distortions for subsequent compensation is one of the greatest challenges for the machine tool industry today. To further minimize thermal effects, it is necessary to know first which the thermal behavior of the machine is. Large scale metrology equipment such as laser tracking devices provides great flexibility and long range which are useful for machine set up, but the uncertainty given by this kind of equipment is not low enough to perform thermal distortion measurements with the required accuracy. However, laser interferometer multilateration schemes improve greatly measurement accuracy.
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