At present, deep holes with a drilling diameter of 2 to 30 mm or even 40 mm have been generally processed by gun drilling. Some of the shallow holes also use this processing method. Under the appropriate processing mode, with its own self-guided centering characteristics, one continuous feeding can achieve the processing quality that can be guaranteed by drilling, expanding and reaming processes: aperture precision IT7～IT9, surface roughness Ra0.04～3.2 Mm, the center line of the hole is 0.01 to 0.02 mm per 100 mm straight, and the center line of the hole is 0.05 to 0.1 mm per 100 mm, and the processing efficiency is higher than the general one.
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