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Drilling is generally done by drilling and drilling deep holes. Guided by the drill sleeve, each time a hole is machined, the tool must enter and exit the drill sleeve once, and the drill bit and the drill sleeve have a certain relative motion and cutting load. The distance from the end face of the drill sleeve to the surface of the workpiece directly affects the discharge of the chip by the spiral groove of the drill bit. The discharge amount directly affects the wear of the drill sleeve and affects the machining quality of the workpiece. The lower end of the fixed drill sleeve should extend beyond the drill template and should not be shrunk into the drill template. This prevents the ribbon chips from getting caught in the drill sleeve and slowing the wear of the drill sleeve.