Title：Selection standard for dimension reference of shaft sleeve parts Name：Selection standard for dimension reference of shaft sleeve parts Content： 1、 Classification of benchmarks Classified by use basis: 1. Design basis. The points, lines, and surfaces used to determine the position of the part in the 6014 spider bushing machine are referred to as the design basis. 2. Process baseline. The benchmark selected for processing, measuring, and inspecting parts. According to the form of reference: ① reference point, a point on the surface of a part. ② Reference line, the axis of the rotational surface on the part. ③ A surface on a part that has the main assembly surface and support surface on the part; The main machining surfaces (positioning surfaces, contact surfaces) on the part; The symmetrical surface of the part (symmetrical in a certain direction). 2、 Selection of benchmarks In order to reduce errors and ensure the design requirements of the parts, it is best to make t...
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