When mass production of parts such as boxes and cylinder heads, a flat plane and two positioning holes are often used as positioning references for combined positioning. This combined positioning method is called one-two-hole positioning. According to the three-base system in the theory of shape and position tolerance, that is, the reference system composed of three mutually perpendicular reference planes, its three planes are the starting point for determining and measuring the relationship between the geometric elements on the parts, and are the design, process, and inspection. The basis and basis. The positioning of the part in the fixture is the six-point positioning principle, and the positioning is the specific application of the three-base system.
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