A gun drill is a fluted drill used for long, straight bores, with coolant pumped through one or two holes. It can be used on various materials and comes in different sizes and variations. Coolant is used to prevent overheating and extract material. Gun drills can be external or internal for chip removal and are used with deep hole drilling machines.
A gun drill is a fluted drill used for drilling. The bit has one or two holes in the bit through which fluid or compressed air is pumped to supply coolant. This tool is used for jobs that require long, straight bores, such as the guns of the same name, for which it was originally created. Other objects it can pierce include musical instruments such as the clarinet or some types of pipes. It can be used on metal, plastic, wood or composite materials.
While the essential design of the gun drill tends to be the same, it comes in hundreds of different sizes and variations. Cutting bits can be made from metal or carbide, although the latter tends to be more popular due to better durability. The speed and power of the equipment that drills and the pressure of the coolant also vary depending on the type of project and the materials to be used.
Coolant is used on a gun drill primarily due to the length of the hole made with a reaming tool. Helps keep the cutting edge from overheating during long periods of activity. The coolant is also used to extract material that the drill has cut away from the drill site. It can pull these chips up to the entrance of the hole, but they can also be deposited through a hole located in the center of the drill bit lengthwise.
Gun drills are external or internal types for chip removal. The external clearing type removes chips along the outside of the drill shaft along a special flute, while the internal type removes cut material by pushing it up through the hollow center of the tool. Most pistol drills have one hole in the bit, although there may be two holes for larger jobs. The shape of the hole is usually round, although it can have a longer and irregular kidney shape.
Most of the gun drill accessories are used on equipment known as deep hole drilling machines. These consist of large, long consoles with the drill attachment resting on top and extending most of the length of the machine. They can have one or more chucks to which the drill attachment or attachments are attached. A typical deep-hole drill is operated via an electronic screen and keyboard similar in appearance to a laptop computer.
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