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Oil drill design is mostly based on practical experience, combined with trial and error method, repeated design and calculation,

Thus the design precision low, long period, it is difficult to improve the quality of design, and each can only be calculated to design a drill bit inefficient. Therefore, developing a set of oil drill CAD system, oil drill parametric drawing is very necessary. 1 overall design of the system oil drill parametric drawing system uses functional modular programming method, the entire system is divided into four functional modules: User interface management module, the bit cutting structure design module, database management module, parametric drawing module. User interface design, using VBA secondary development tools embedded in AutoCAD implementation. User input parameters oil drill design through the user interface module, human-computer exchange of information. The main function of the bit cutting structure design module is to complete the complex design data calculated according to the oil drill bit design of oil theory

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