Abstract:The working principle and the realization of double cylinder positioning jig for link parts were introduced. Feasibility analysis of the jig was also given. The jig has many advantages, such as simple structure, good manufacturing processes, flexible layout, convenient for adjustment, high efficiency and strong practicability. Based on the principle of double cylinder positioning, the jig for milling and grinding end face of link parts can be designed, it can effectively avoid interference problems between machining tool and clamping elements.