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In this case, the tool bits are of the brazed carbide type. Boring bar marked B. A boring bar is a tool used in metalworking and woodworking. Boring is a technique used in many aspects of building. Woodworkers have used boring as a form of drilling for centuries. In woodworking, the boring tool is static in size and used to form circular plunge ...
Workpieces are commonly 1 to 4 metres (3 ft 3 in to 13 ft 1 in) in diameter, but can be as large as 20 m (66 ft). Power requirements can be as much as 200 horsepower (150 kW). Cooling of the bores is done through a hollow passageway through the boring bar where coolant can flow freely.
A trepan, sometimes called a BTA drill bit (after the Boring and Trepanning Association), is a drill bit that cuts an annulus and leaves a center core. Trepans usually have multiple carbide inserts and rely on water to cool the cutting tips and to flush chips out of the hole. Trepans are often used to cut large diameters and deep holes.
Historically, cannons had been cast with a core and then bored to remove imperfections, but in 1774 Wilkinson patented a technique for boring iron guns from a solid piece, rotating the gun barrel rather than the boring-bar. This technique made the guns more accurate since the bore was uniform in diameter, and less likely to explode.
As well, modern turning (lathe) tooling may use a carbide insert on a carbide tool such as a boring bar, which are more rigid than steel insert holders and therefor less prone to vibration, which is of particular importance with boring or threading bars that may need to reach into a part to a depth many times the tool diameter.
In 1973, Metalcut developed the first high-efficiency carbide pivot saw for 75 mm (3 inches) bars, where the center of rotation of the gearbox was mounted to the floor plate. This saw cuts on both sides of the pivot axis, one bar each, and was more productive as a result.
A tungsten carbide tipped (TCT) and high-speed steel (HSS) annular cutter (also known as a "core drill" or "hole saw"). An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal.
For example, in Boeing Design Manual BDM-1327 section 3.5, the nominal diameter of the spotfaced surface is the same as the nominal size of the cutter, and is equal to the flat seat diameter plus twice the fillet radius.
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