Digital incremental linear encoders are considered as proven and reliable standard positioning measuring systems in CNC-machine tools. A further detailed inspection reveals that such a measuring system consists of a combination of materials, i.e. casting (table of machine tools), aluminum and glass (linear encoder) with different thermal coefficients of expansion. Due to the increasing demand of the accuracy of CNC-machine tools, this sophisticated complex system with its interacting influence of expansion is a fastidious topical research subject. The test equipment, a six metre high precision length comparator which was developed and produced by our department, is located in an air conditioned laboratory.
|Effective start/end date||1/01/90 → 31/01/06|
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