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Encyclopedia > Gun drill

Gun drills are straight fluted drills which allow coolant to be directed through the drill's body, directly to the cutting face. They are used for deep drilling of which gun barrels are the obvious example. The coolant provides lubrication and cooling to the cutting edges as well as ejecting the swarf or chips back out the drills length. Modern gun drills take advantage of carbide tips to reduce expense and prolong life. The images show the coolant holes in the drills shank and tip, as well as full length (12mm dia x 635mm long) gun drill and the carbide tip of a second (25mm) gun drill. Cutting fluid or coolant is liquid used to cool and lubricate the cutting edges of machine tools and the pieces they are shaping. ... The barrel of a gun or other firearm is the tube, usually metal, through which a controlled explosion is released in order to propel a projectile out of the end at great speed. ... various examples of swarf, including a block of compressed swarf Swarf (or turnings) is the debris or waste resulting from metalworking operations. ... Tungsten carbide, WC or W2C, is a chemical compound containing tungsten and carbon, similar to titanium carbide. ... A tool bit generally refers to a plain High Speed Steel (HSS) tool. ...

motivation

It is difficult to drill a deep hole (where deep is approximately 3 times the diameter of the hole) that is both straight and accurately sized with a standard twist drill. This is a problem in many manufacturing processes, especially the firearms industry. The barrel of a gun must be very straight and quite accurately sized. Gun barrels are often as much as 30 times as long as their inside diameter. Thus the gun drill was invented to create these long straight holes.


construction

There are two basic types of gun drills: the internal chip removal type and the external chip removal type. The internal type is basically a tube with a cutting bit on the front. Coolant is forced around the outside of the tube, and pours around the front of the drill forcing the chips into the center of the tube, and out of the hole.


The external chip removal type operates similarly except there is a notch cut in the outside of the drill, through which the chips exit, and a passage for the coolant goes through the center of the bar.



Metalworking:

Drilling and threading: Image File history File links Blacksmith-hammer-anvil-50x50. ... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ...

Die head | Drill | Drill bit | Drill bit shank | Drill bit sizes | Drilling| Pin chuck| Taps and dies | Tap wrench A die head is a threading die that is used in the high volume production of threaded components. ... A drill is a tool with a rotating drill bit used for drilling holes in various materials. ... Drill bits are the cutters of drill tools. ... The shank is the part of a drill bit grasped by the chuck of a drill. ... Drill bits are the cutting tools of drilling machines. ... An electric drill A drill is a tool with a rotary drill bit used to bore holes through material. ... Two pin chucks. ... Taps and dies are tools commonly used in metalworking for the cutting of screw threads in metal parts. ... This article needs to be wikified. ...


Metalworking topics:   Casting | CNC | Cutting tools | Drilling and threading | Fabrication | Finishing | Grinding | Jewellery | lathe (tool) | Machining | Machine tooling | Measuring | Metalworking | Hand tools | Metallurgy | Milling | Occupations | Press tools | Smithing | Terminology | Welding One half of a bronze mold for casting a socketed spear head dated to the period 1400-1000 BC. This article is about the manufacturing process; for other uses, see Casting (disambiguation). ... A CNC Turning Center The abbreviation CNC stands for Computer(ized) Numerical(ly) Control(led), and refers specifically to the computer control of machine tools for the purpose of (repeatedly) manufacturing complex parts in metal as well as other materials, using a program written in a notation conforming to the... a Cutting Tool, in the context of Metalworking is any tool that is used to remove metal from the workpiece by means of shear deformation. ... Drilling is the process of using a drill bit in a drill to produce holes. ... A typical steel fabrication shop Fabrication is an industrial term generally applied to the building of metal machines and structures. ... Rotating abrasive wheel on a bench grinder. ... Comedian Joan Rivers wearing bracelets, necklaces, and rings on the cover of a book about her jewellery collection. ... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis... A lathe is a common tool used in machining. ... A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. ... Turned chess pieces Metalworking is the craft and practice of working with metals to create parts or structures. ... Metalworking hand tools are hand tools that are used in the metalworking field. ... Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements, their intermetallic compounds and their mixtures, which are called alloys. ... Cutters for a milling machine. ... It has been suggested that this article or section be merged with Smith (metalwork). ... Power press with a fixed barrier guard A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure. ... A smith or metalsmith is a person involved in the shaping of metal objects. ... This article needs to be wikified. ... Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ...



 

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