The paper presents a promised way of feature recognition from 2D engineering drawing--developing special system and extracting features from machining drawings. In general,researchers inclined to extract features from design drawings and ignored machining drawings.Actually, both of machining and design information shows the same importance in developing newproducts. Not only can machining drawing provide us with feature model or 3D geometrical model ofthe part, but also they can be easily recognized. In the paper the processes and methods of featurerecognition from three-cone-bit (A Kind of aiguilles used to drill oil well) machining drawings areintroduced. Firstly, overall approach is explained. Secondly, two methods of form feature recognitionare introduced: symbol-matching method used to analyze annularity or chained graph and methodbased on feature-hint used to recognize the general features. Thirdly, feature parameters are extractedFinally, a practical implementation is given.
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