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According to the characters of openness, modularization and interface of the NC control SINUMERIK 840D on machine tools, we use MPI, DDE to communicate/data-exchange with SINUMERIK 840D. And a data acquisition system for circular tests on NC machine tools is designed and developed. Based on ISO 230-4-2005 standard for circular tests, some evaluation parameters of circular tests is introduced. And it is verified though simulated data and real data.