The first is the principle of coincidence of benchmarks. Should choose the design reference as possible as the positioning reference. Especially in the final completion, to ensure accuracy, we should pay more attention to this principle. This avoids positional error reference deviations;
Second: the principle of unity. Should choose a unified positioning surface of the various surface treatment, as far as possible to ensure the accuracy of the position between the surface; sometimes follow the principle of common benchmarks, repeated processing;
Third: Self-referenced principles. Some small machining allowances and uniform finishing processes ensure machining quality and productivity, and the precision machined surface itself serves as a foundation level.
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