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The deviation control is to restrict the drilling direction of the bit from time to time. The drilling direction is of course depending on the direction of the resultant forces acting on the bit. What is the relationship between these directions? Are there any other influential factors? Answers to such questions, different points of view were subjected to analysis.doi:10.3844/ajassp.2005.711.718 fatcat:s54z3x3yovho7cxeotc7qtzjfq