Based on the model for circuit analysis of a Stephenson six-bar chain, this paper presents a feature point loop method to identify the motion order defect of a Stephenson six-bar chain. The proposed method can determine whether a linkage synthesized by precision point synthesis can pass through all positions in the prescribed order and yet not have to carry through the detailed kinematic analysis of the linkage. In addition, this method is applicable to any type Stephenson six-bar linkage and regardless of whichever link is used as the input. The result resolves one fundamental and troublesome problem encountered in a Stephenson six-bar linkage synthesis.

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