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A systematic methods based on customer maintenance data, IDEF0 skills, and adjacency matrix test is proposed to design the knowledge base of diagnostic expert system for CNC machining center. From the customer maintenance data, a hierarchical knowledge base consisting of category, symptom, failure, test and repair is constructed, The relationship between component category of CNC machine center and symptom is specified using IDEF0 skills. Then the consistency between knowledge base and customer maintenance data is verified through adjacency matrix test. After this, a second test for the knowledge base is through many feedbacks from users. Also a prototype diagnostic expert system based on InSuppoert for a CNC machining center FV-800A, Fair Friend Ent. Group, has been implemented for demonstration purpose.
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