Deep hole drills are drills specially designed for machining deep holes. The deep hole drill is welded together by three parts: drill shank, drill rod and drill bit, and there is a through hole in the middle. It is suitable for drilling cast iron, carbon steel, copper, aluminum alloy, alloy steel, etc. The gun drill completes drilling, boring and reaming at one time, and can process high precision (IT6-8 grade), precise straightness (0.16-0.33mm/1000mm) and low roughness (Ra3.2- Ra0.1) hole. Its drilling speed reaches more than 30-100 m/min.

When using a deep hole drill, pay attention to 2 points, namely:
(1) The end face of the workpiece is perpendicular to the axis of the workpiece to ensure reliable sealing of the end face.
(2) A shallow hole is pre-drilled on the workpiece hole before the formal processing, which can play the role of guiding and centering when drilling.
In machining, a hole with a ratio of hole depth to diameter greater than 6 is usually called a deep hole. When drilling with a deep hole drill, it is difficult to dissipate heat and remove chips, and the rigidity of the drill pipe is poor due to its slenderness, which is easy to produce. Bending and vibration, so cooling and chip evacuation problems are generally solved with the help of a pressure cooling system.
Deep hole drills are also called carbide gun drills, and the materials used are generally mostly titanium-cobalt bonded steel. The selection of the amount of deep hole drilling tools should be reasonable.
The deep hole drill should not be pressed too tightly, so as not to damage the deep hole drill. The clamping taper shank deep hole drill should be pressed on the top with soft metal and should not be touched. When using a drill chuck, it should be tightened with a wrench, and the housing should not be tightened.