The chief benefit of this bit is that it cuts consistently, if slowly compared to a bit used in a power tool. Until relatively recently, they were produced in a configuration much like the one you see here, a design hundreds of years old. These bits were available in various shapes, diameters and lengths. It's meant to be used in a tool called a bit brace (or sometimes, simply, a brace). A time-honored bit for making holes in wood is the auger bit. Woodworkers have been making holes since people began working with wood. When sharp, the bit cuts a consistently smooth and round hole in hardwoods and softwoods. The traditional auger bit has a pyramid shaped base that is meant to fit into the jaws of a brace. SDS masonry bits have a specialized base formed to permit this easy insertion into the chuck of an SDS rotary hammer. This tool has a spring-loaded chuck that allows the bit to be inserted, it doesn't have to be tightened. The other form of this bit is designed for use in a specialized power tool called an SDS rotary hammer. Its hex shank prevents the bit from slipping in the drill's chuck. The general hex-shank masonry bit is for use in an ordinary drill driver. But with a well-made masonry bit, that's exactly what you get–a tough bit with an ever tougher carbide tip. The bit itself has to be able to withstand bending or snapping and the carbide has to stay securely attached to it. Or rather, a tough bit with an even tougher tip, preferably a piece of carbide brazed onto the body of the bit. Roy Berendsohn Masonry Bitĭrilling through rock, concrete, concrete block, brick, and mortar requires a tough bit. Whereas the SDS version of the bit (right) is intended for use in a rotary hammer that has the specialized chuck that allows the bit to be inserted. These heavy-duty bits better resist heat and wear when drilling metals, particularly thick pieces of steel, cast iron or stainless steel.Ī general-purpose masonry bit (left) can be used in any sort of drill. Industrial-duty versions of twist drill bits are made from various forms of high-speed steel (such as a cobalt-molybdenum alloy, M42), and these bits may also have a wear-resistant nitride (or other) coating that gives them a black or gold color. There are forms of this drill bit that have a 118-degree tip that are more well suited for drilling wood, but in the last several years, these have become very hard to find (they have been displaced by the next bit shown, the brad point). It’s designed for drilling metal, but it will also drill wood. The most commonly-available form of this drill bit is the type with a 135-degree tip. The debris it produces is transported out of the hole by the helix-shaped channel machined into the side of the bit. The cone-shaped tip of a twist drill bit cuts with a diagonal shearing action. Roy Berendsohn Twist Drills for Metal and Wood From left to right: a heavy-duty version with a titanium nitride coating and bullet-shaped tip for easy centering and a hex shank for use in an impact driver a standard twist drill with a black oxide coating for increased wear resistance, and a standard twist drill with black oxide coating and a hex shank for use in an impact driver. Twist drills come in all manner of diameters and body configurations.
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