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3–1 Development of STEP-NC Compliant Machine Tool Data Model W. Z. Yang 1 , X. Xu 2 and S. Q. Xie 3 Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand 1 wyan041@ec.auckland.ac.nz 2 x.xu@auckland.ac.nz 3 s.xie@auckland.ac.nz Abstract. To implement STEP-NC based manufacturing, a STEP-NC compliant machine tool data model (STEP-NCMtDm) is developed by using EXPRESS modelling lanugage. It models sufficient machine tool data to ‘transfer’ STEP-NC machining