For general bracket parts, it is completely reasonable to use the opposite surface of the bracket bottom surface as the rough reference.But for this part, if the opposite surface of the bottom of the bracket is used as the rough reference.

　　Therefore, in accordance with the selection principle of the rough reference (that is, when the part has unmachined surfaces, these unmachined surfaces should be used as the rough reference; if the part has several unmachined surfaces, the relative position accuracy should be higher than the machined surface requirements. The unprocessed surface is used as a rough reference).

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