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Can the tolerance levels of perpendicularity and parallelism in general machining today reach level 4 or level 5? What is the highest accuracy that can be achieved in general factory processing?

General production is level 7, 8, and 9

The highest level of general factories can reach level 5, such as: grinding, super-finishing, precision grinding, polishing, and hand reaming

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No matter how high the level is, special equipment is required, which is generally not needed

Bonus points for purely manual answers

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