1185:, they use replaceable carbide or ceramic inserts as a cutting face to alleviate the need for a tool grinder. One insert is responsible for the outer radius of the cut, and another insert is responsible for the inner radius. The tool itself handles the point deformity, as it is a low-wear task. The bit is hardened and coated against wear far more than the average drill bit, as the shank is non-consumable. Almost all indexable drill bits have multiple coolant channels for prolonged tool life under heavy usage. They are also readily available in odd configurations, such as straight flute, fast spiral, multiflute, and a variety of cutting face geometries.
745:
2063:
911:
2041:
807:
1041:
1979:
845:
1719:
616:
606:
complex geometries that would otherwise cause braze failure in the smaller "segments". PCD bits are typically used in the automotive, aerospace, and other industries to drill abrasive aluminum alloys, carbon-fiber reinforced plastics, and other abrasive materials, and in applications where machine downtime to replace or sharpen worn bits is exceptionally costly. PCD is not used on ferrous metals due to excess wear resulting from a reaction between the carbon in the PCD and the iron in the metal.
791:
1586: in (13 mm) up the shank before ending. The other flute continues full-length up the shank for waste removal. The Irwin bit may afford greater space for waste removal, greater strength (because the design allows for a center shank of increased size within the flutes, as compared to the Jenning bits), or smaller manufacturing costs. This style of bit was invented in 1884, and the rights sold to Charles Irwin who patented and marketed this pattern the following year.
488:
1528:
1646:
1848:
1658:
1832:
1674:
1860:
1616:
1540:
1604:
1404:
1197:
779:
216:
1459:
933:
227:
1451:
100:
1110:. Unlike other drills, the purpose is often to retrieve the core rather than simply to make a hole. A diamond core drill bit is intended to cut an annular hole in the workpiece. Large bits of similar shape are used for geological work, where a deep hole is drilled in sediment or ice and the drill bit, which now contains an intact core of the material drilled with a diameter of several centimeters, is retrieved to allow study of the
1963:
1033:
1872:
1288:
1392:
1342:. The bits have an extremely fast cutting tool geometry: no point angle, combined with a large (considering the flat cutting edge) lip angle, causes the edges to take a very aggressive cut with relatively little point pressure. This means these bits tend to bind in metal; given a workpiece of sufficient thinness, they have a tendency to punch through and leave the bit's cross-sectional geometry behind.
50:
324:
cause binding, wear, and eventual catastrophic failure of the tool. The proper amount of lip clearance is determined by the point angle. A very acute point angle has more web surface area presented to the work at any one time, requiring an aggressive lip angle, where a flat bit is extremely sensitive to small changes in lip angle due to the small surface area supporting the cutting edges.
197:
1635:, a self-contained tool for boring small holes in wood by hand. Since about 1850, gimlets have had a variety of cutter designs, but some are still produced with the original version. The gimlet bit is intended to be used in a hand brace for drilling into wood. It is the usual style of bit for use in a brace for holes below about 7 mm (0.28 in) diameter.
1794:, which hammers the bit into the material being drilled as it rotates; the hammering breaks up the masonry at the drill bit tip, and the rotating flutes carry away the dust. Rotating the bit also brings the cutting edges onto a fresh portion of the hole bottom with every hammer blow. Hammer drill bits often use special shank shapes such as the
1354:
spurs in an attempt to ensure a cleaner hole. With their small shank diameters relative to their boring diameters, spade bit shanks often have flats forged or ground into them to prevent slipping in drill chucks. Some bits are equipped with long shanks and have a small hole drilled through the flat part, allowing them to be used much like a
316:, or the angle formed at the tip of the bit, is determined by the material the bit will be operating in. Harder materials require a larger point angle, and softer materials require a sharper angle. The correct point angle for the hardness of the material influences wandering, chatter, hole shape, and wear rate.
1005:, as they are referenced in the U.S.). The included angle of the spotting drill bit should be the same as, or greater than, the conventional drill bit so that the drill bit will then start without undue stress on the bit's corners, which would cause premature failure of the bit and a loss of hole quality.
1420:
used by chair-makers for boring or reaming holes in the seats and arms of chairs. Their design is ancient, going back to Roman times. Spoon bits have even been found in Viking excavations. Modern spoon bits are made of hand-forged carbon steel, carefully heat-treated and then hand ground to a fine edge.
710:, who experimented with the pitch of the twist. The original method of manufacture was to cut two grooves in opposite sides of a round bar, then to twist the bar (giving the tool its name) to produce the helical flutes. Nowadays, the drill bit is usually made by rotating the bar while moving it past a
1947:
or even higher—are used; this translates to a reasonably fast linear speed of the cutting tip in these very small diameters. The high speed, small diameter, and the brittleness of the material, make the bits very vulnerable to breaking, particularly if the angle of the bit to the workpiece changes at
1427:
When reaming a pre-bored straight-sided hole, the spoon bit is inserted into the hole and rotated in a clockwise direction with a carpenters' brace until the desired taper is achieved. When boring into solid wood, the bit should be started in the vertical position; after a "dish" has been created and
1008:
Most modern solid-carbide bits should not be used in conjunction with a spot drill bit or a center drill bit, as solid-carbide bits are specifically designed to start their own hole. Usually, spot drilling will cause premature failure of the solid-carbide bit and a certain loss of hole quality. If it
876:
Unibits are ideal for use in electrical work where thin steel, aluminum or plastic boxes and chassis are encountered. The short length of the unibit and ability to vary the diameter of the finished hole is an advantage in chassis or front panel work. The finished hole can often be made quite smooth
872:
Unibits are commonly used on sheet metal and in general construction. One drill bit can drill the entire range of holes necessary on a countertop, speeding up installation of fixtures. They are often used on softer materials, such as plywood, particle board, drywall, acrylic, and laminate. They can
736:
Manufacturers can produce special versions of the twist drill bit, varying the geometry and the materials used, to suit particular machinery and particular materials to be cut. Twist drill bits are available in the widest choice of tooling materials. However, even for industrial users, most holes are
323:
is the angle between the face of the cut material and the flank of the lip, and determines the amount of support provided to the cutting edge. A greater lip angle will cause the bit to cut more aggressively under the same amount of point pressure as a bit with a smaller lip angle. Both conditions can
296:
removal. A fast spiral (high twist rate or "compact flute") drill bit is used in high feed rate applications under low spindle speeds, where removal of a large volume of chips is required. Low spiral (low twist rate or "elongated flute") drill bits are used in cutting applications where high cutting
1314:
Conventional twist drill bits tend to wander when presented to a flat workpiece. For metalwork, this is countered by drilling a pilot hole with a spotting drill bit. In wood, the brad point drill bit is another solution: the center of the drill bit is given not the straight chisel of the twist drill
975:
Center drill bits are meant to create a conical hole for "between centers" manufacturing processes (typically lathe or cylindrical-grinder work). That is, they provide a location for a (live, dead, or driven) center to locate the part about an axis. A workpiece machined between centers can be safely
752:
The most common twist drill bit (sold in general hardware stores) has a point angle of 118 degrees, acceptable for use in wood, metal, plastic, and most other materials, although it does not perform as well as using the optimum angle for each material. In most materials it does not tend to wander or
1596:
The bit shown in the picture is a modern design for use in portable power tools, made in the UK in about 1995. It has a single spur, a single radial cutting edge and a single flute. Similar auger bits are made with diameters from 6 mm (3/16 in) to 30 mm (1 3/16 in). Augers up to
1428:
the bit has begun to "bite" into the wood, the angle of boring can be changed by tilting the brace a bit out of the vertical. Holes can be drilled precisely, cleanly and quickly in any wood, at any angle of incidence, with total control of direction and the ability to change that direction at will.
1419:
Spoon bits consist of a grooved shank with a point shaped somewhat like the bowl of a spoon, with the cutting edge on the end. The more common type is like a gouge bit that ends in a slight point. This is helpful for starting the hole, as it has a center that will not wander or walk. These bits are
1326:
drilled across the grain, however, produces long strands of wood fiber. These long strands tend to pull out of the hole, rather than being cleanly cut at the hole edge. The brad point drill bit has the outside corner of the cutting edges leading, so that it cuts the periphery of the hole before the
1273:
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
1219:
whose heads are broken or too damaged to allow a screwdriver tip to engage, making use of a screwdriver impossible. The extractor is pressed against the damaged head and rotated counter-clockwise and will tend to jam in the damaged head and then turn the screw counter-clockwise, unscrewing it. For
918:
Hole saws take the form of a short open cylinder with saw-teeth on the open edge, used for making relatively large holes in thin material. They remove material only from the edge of the hole, cutting out an intact disc of material, unlike many drills which remove all material in the interior of the
895:
Although it is claimed that the stepped drill was invented by Harry C. Oakes it was in fact conceived by George
Godbold and first produced by Bradley Engineering, Wandsworth, London in the 1960s and named the Bradrad. It was marketed under this name until the patent was sold to Halls Ltd.uk by whom
880:
An additional use of unibits is deburring holes left by other bits, as the sharp increase to the next step size allows the cutting edge to scrape burrs off the entry surface of the workpiece. However, the straight flute is poor at chip ejection, and can cause a burr to be formed on the exit side of
2020:
could be difficult. Some installer bits have a transverse hole drilled at the shank end as well. Once a hole has been drilled, the wire can be threaded through the shank end, the bit released from the chuck, and all pulled forward through the drilled hole. These bits are made for cement, block and
1638:
The tip of the gimlet bit acts as a tapered screw, to draw the bit into the wood and to begin forcing aside the wood fibers, without necessarily cutting them. The cutting action occurs at the side of the broadest part of the cutter. Most drill bits cut the base of the hole. The gimlet bit cuts the
1592:
The diameter of auger bits for hand braces is commonly expressed by a single number, indicating the size in 16ths of an inch. For example, #4 is 4/16 or 1/4 in (6 mm), #6 is 6/16 or 3/8 in (9 mm), #9 is 9/16 in (14 mm), and #16 is 16/16 or 1 in (25 mm). Sets
1511:
The edge of the bit has a sharpened spur to cut the fibers of the wood, as in the brad point drill bit. A radial cutting edge planes the wood from the base of the hole. In this version, there is minimal or no spiral to remove chips from the hole. The bit must be periodically withdrawn to clear the
1423:
Spoon bits are the traditional boring tools used with a brace. They should never be used with a power drill of any kind. Their key advantage over regular brace bits and power drill bits is that the angle of the hole can be adjusted. This is very important in chairmaking, because all the angles are
1353:
Spade bits are used for rough boring in wood. They tend to cause splintering when they emerge from the workpiece. Woodworkers avoid splintering by finishing the hole from the opposite side of the work. Spade bits are flat, with a centering point and two cutters. The cutters are often equipped with
331:
of a bit determines how deep a hole can be drilled, and also determines the stiffness of the bit and accuracy of the resultant hole. While longer bits can drill deeper holes, they are more flexible meaning that the holes they drill may have an inaccurate location or wander from the intended axis.
2015:
bits, are a type of twist drill bit for use with a hand-portable power tool. The key distinguishing feature of an installer bit is a transverse hole drilled through the web of the bit near the tip. Once the bit has penetrated a wall, a wire can be threaded through the hole and the bit pulled back
1746:
These bits are available both in a version similar to an auger bit or brace bit, designed for low speed, high torque use with a brace or other hand drill (pictured to the right), or as a high speed, low torque bit meant for a power drill. While the shape of the cutting edges is different, and one
1568:
or
Jennings-pattern bit has a self-feeding screw tip, two spurs and two radial cutting edges. This bit has a double flute starting from the cutting edges, and extending several inches up the shank of the bit, for waste removal. This pattern of bit was developed by Russell Jennings in the mid-19th
1478:
which guides it throughout the cut (and incidentally spoils the otherwise flat bottom of the hole). The cylindrical cutter around the perimeter shears the wood fibers at the edge of the bore, and also helps guide the bit into the material more precisely. Forstner bits have radial cutting edges to
1470:
in 1886. They bore precise, flat-bottomed holes in wood, in any orientation with respect to the wood grain. They can cut on the edge of a block of wood, and can cut overlapping holes; for such applications they are normally used in drill presses or lathes rather than in hand-held electric drills.
1079:
as they have no cutting point or means of starting a hole. They have 3 or 4 flutes which enhances the finish of the hole and ensures the bit cuts evenly. Core drill bits differ from reamers in the amount of material they are intended to remove. A reamer is only intended to enlarge a hole a slight
498:
Many different materials are used for or on drill bits, depending on the required application. Many hard materials, such as carbides, are much more brittle than steel, and are far more subject to breaking, particularly if the drill is not held at a very constant angle to the workpiece; e.g., when
1208:
engineering industry on screw machines or drilling heads. Left-handed drill bits allow a machining operation to continue where either the spindle cannot be reversed or the design of the machine makes it more efficient to run left-handed. With the increased use of the more versatile CNC machines,
1801:
Masonry bits of the style shown are commonly available in diameters from 3 mm to 40 mm. For larger diameters, core bits are used. Masonry bits up to 1,000 mm (39 in) long can be used with hand-portable power tools, and are very effective for installing wiring and plumbing in
1507:
The center of the bit is a tapered screw thread. This screws into the wood as the bit is turned, and pulls the bit into the wood. There is no need for any force to push the bit into the workpiece, only the torque to turn the bit. This is ideal for a bit for a hand tool. The radial cutting edges
1128:
A countersink is a conical hole cut into a manufactured object; a countersink bit (sometimes called simply countersink) is the cutter used to cut such a hole. A common use is to allow the head of a bolt or screw, with a shape exactly matching the countersunk hole, to sit flush with or below the
992:
Traditional twist drill bits may tend to wander when started on an unprepared surface. Once a bit wanders off course it is difficult to bring it back on center. A center drill bit frequently provides a reasonable starting point as it is short and therefore has a reduced tendency to wander when
605:
mass to a tungsten-carbide support. Bits are fabricated using this material by either brazing small segments to the tip of the tool to form the cutting edges or by sintering PCD into a vein in the tungsten-carbide "nib". The nib can later be brazed to a carbide shaft; it can then be ground to
1951:
Resharpened and easily available PCB drills have historically been used in many prototyping and home PCB labs, using a high-speed rotary tool for small-diameter bits (such as a Moto-Tool by Dremel) in a stiff drill-press jig. If used for other materials these tiny bits must be evaluated for
1734:
to lock the cutter in position. When the cutting edge is centered on the bit, the hole drilled will be small, and when the cutting edge is slid outwards, a larger hole is drilled. This allows a single drill bit to drill a wide variety of holes, and can take the place of a large, heavy set of
1083:
Using an ordinary two-flute twist drill bit to enlarge the hole resulting from a casting core will not produce a clean result, the result will possibly be out of round, off center and generally of poor finish. The two fluted drill bit also has a tendency to grab on any protuberance (such as
756:
A more aggressive angle, such as 90 degrees, is suited for very soft plastics and other materials; it would wear rapidly in hard materials. Such a bit is generally self-starting and can cut very quickly. A shallower angle, such as 150 degrees, is suited for drilling steels and other tougher
835:
is a drill bit that has the tip ground down to a different diameter. The transition between this ground diameter and the original diameter is either straight, to form a counterbore, or angled, to form a countersink. The advantage to this style is that both diameters have the same flute
1330:
Brad point drill bits are also effective in soft plastic. When using conventional twist drill bits in a handheld drill, where the drilling direction is not maintained perfectly throughout the operation, there is a tendency for hole edges to be "smeared" due to side friction and heat.
238:
is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In order to create holes drill bits are usually attached to a
2244:
Nguyen, Dinh et al "Tool Wear of
Superhard Ceramic Coated Tools in Drilling of CFRP/Ti Stacks." Proceedings of the ASME 2019 14th International Manufacturing Science and Engineering Conference. Volume 2: Processes; Materials. Erie, Pennsylvania, USA. June 10–14, 2019. V002T03A089.
2232:
Nguyen, Dinh et al "Tool Wear of
Superhard Ceramic Coated Tools in Drilling of CFRP/Ti stacks." Proceedings of the ASME 2019 14th International Manufacturing Science and Engineering Conference. Volume 2: Processes; Materials. Erie, Pennsylvania, USA. June 10–14, 2019. V002T03A089.
728:
The geometry and sharpening of the cutting edges is crucial to the performance of the bit. Small bits that become blunt are often discarded because sharpening them correctly is difficult and they are cheap to replace. For larger bits, special grinding jigs are available. A special
1924:
twist bits, which drill quickly through the board while providing a moderately long life, are almost always used. Carbide PCB bits are estimated to outlast high-speed steel bits by a factor of ten or more. Other options sometimes used are diamond or diamond-coated bits.
836:
characteristics, which keeps the bit from clogging when drilling in softer materials, such as aluminum; in contrast, a drill bit with a slip-on collar does not have the same benefit. Most of these bits are custom-made for each application, which makes them more expensive.
1709:
cutter is needed, but the complex shape of a forstner bit is difficult to manufacture in carbide, so this special drill bit with a simpler shape is commonly used. It has cutting edges of tungsten carbide brazed to a steel body; a center spur keeps the bit from wandering.
2112:
Different shapes of shank are used. Some are simply the most appropriate for the chuck used; in other cases particular combinations of shank and chuck give performance advantages, such as allowing higher torque, greater centering accuracy, or efficient hammering action.
1887:
Glass bits have a spade-shaped carbide point. They generate high temperatures and have a very short life. Holes are generally drilled at low speed with a succession of increasing bit sizes. Diamond drill bits can also be used to cut holes in glass, and last much longer.
760:
Drill bits with no point angle are used in situations where a blind, flat-bottomed hole is required. These bits are very sensitive to changes in lip angle, and even a slight change can result in an inappropriately fast cutting drill bit that will suffer premature wear.
1147:–4 in or 19–102 mm diameter). An ejector drill bit uses a specially designed carbide cutter at the point. The bit body is essentially a tube within a tube. Flushing water travels down between the two tubes. Chip removal is back through the center of the bit.
1766:
The diamond masonry mortar bit is a hybrid drill bit, designed to work as a combination router and drill bit. It consists of a steel shell, with the diamonds embedded in metal segments attached to the cutting edge. These drill bits are used at relatively low speeds.
996:
While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a
1220:
screws that break off deeper in the hole, an extractor set will often include left handed drill bits of the appropriate diameters so that grab holes can be drilled into the screws in a left handed direction, preventing further tightening of the broken piece.
585:
are extremely hard and can drill virtually all materials, while holding an edge longer than other bits. The material is expensive and much more brittle than steels; consequently they are mainly used for drill-bit tips, small pieces of hard material fixed or
633:(TiN) is a very hard metallic material that can be used to coat a high-speed steel bit (usually a twist bit), extending the cutting life by three or more times. Even after sharpening, the leading edge of coating still provides improved cutting and lifetime.
2094:
box without needing to remove any material from the wall. These bits usually come with a set of special tools to aim and flex the bit to reach the desired location and angle, although the problem of seeing where the operator is drilling still remains.
1508:
remove a slice of wood of thickness equal to the pitch of the central screw for each rotation of the bit. To pull the bit from the hole, either the female thread in the wood workpiece must be stripped, or the rotation of the bit must be reversed.
645:
Diamond powder is used as an abrasive, most often for cutting tile, stone, and other very hard materials. Large amounts of heat are generated by friction, and diamond-coated bits often have to be water-cooled to prevent damage to the bit or the
1479:
plane off the material at the bottom of the hole. The bits shown in the images have two radial edges; other designs may have more. Forstner bits have no mechanism to clear chips from the hole, and therefore must be pulled out periodically.
1238:
to 2.5 inches (11 to 64 mm). The tool holder usually has a coolant passage running through it. They are capable of cutting to a depth of about 10 times the bit diameter. This type of drill bit can also be used to make stepped holes.
1129:
surface of the surrounding material. (By comparison, a counterbore makes a flat-bottomed hole that might be used with a hex-headed capscrew.) A countersink may also be used to remove the burr left from a drilling or tapping operation.
550:; HSS bits are hard and much more resistant to heat than high-carbon steel. They can be used to drill metal, hardwood, and most other materials at greater cutting speeds than carbon-steel bits, and have largely replaced carbon steels.
1701:
tend to pull out. A specialist hinge has been developed which uses the walls of a 35 mm-diameter (1.4 in) hole, bored in the particle board, for support. This is a very common and relatively successful construction method.
767:
drill bits are unusually long twist drill bits. However, they are not the best tool for routinely drilling deep holes, as they require frequent withdrawal to clear the flutes of swarf and to prevent breakage of the bit. Instead,
1327:
inner parts of the cutting edges plane off the base of the hole. By cutting the periphery first, the lip maximizes the chance that the fibers can be cut cleanly, rather than having to be pulled messily from the timber.
868:
profile. Due to its design, a single bit can be used for drilling a wide range of hole sizes. Some bits come to a point and are thus self-starting. The larger-size bits have blunt tips and are used for hole enlarging.
2388:
1729:
An adjustable wood bit, also known as an expansive wood bit, has a small center pilot bit with an adjustable, sliding cutting edge mounted above it, usually containing a single sharp point at the outside, with a
1948:
all, or the bit contacts any object. Drilling by hand is not practical, and many general-purpose drilling machines designed for larger bits rotate too slowly and wobble too much to use carbide bits effectively.
590:
onto the tip of a bit made of less hard metal. However, it is becoming common in job shops to use solid carbide bits. In very small sizes it is difficult to fit carbide tips; in some industries, most notably
601:(PCD) is among the hardest of all tool materials and is therefore extremely resistant to wear. It consists of a layer of diamond particles, typically about 0.5 mm (0.020 in) thick, bonded as a
1518:
Center bits do not cut well in the end grain of wood. The central screw tends to pull out, or to split the wood along the grain, and the radial edges have trouble cutting through the long wood fibers.
1482:
Sawtooth bits are also available, which include many more cutting edges to the cylinder. These cut faster, but produce a more ragged hole. They have advantages over
Forstner bits when boring into
1932:, and the bits are often automatically replaced by the equipment as they wear, as even solid carbide bits do not last long in constant use. PCB bits, of narrow diameter, typically mount in a
2078:
Another, different, bit also called an installer bit has a very long flexible shaft, typically up to 72 inches (1.8 m) long, with a small twist bit at the end. The shaft is made of
2016:
out, pulling the wire with it. The wire can then be used to pull a cable or pipe back through the wall. This is especially helpful where the wall has a large cavity, where threading a
627:
is an inexpensive black coating. A black oxide coating provides heat resistance and lubricity, as well as corrosion resistance. The coating increases the life of high-speed steel bits.
1424:
usually eyeballed. Another advantage is that they do not have a lead screw, so they can be drilled successfully in a chair leg without having the lead screw peek out the other side.
2062:
1315:
bit, but a spur with a sharp point, and four sharp corners to cut the wood. While drilling, the sharp point of the spur pushes into the soft wood to keep the drill bit in line.
695:
The twist drill bit is the type produced in largest quantity today. It comprises a cutting point at the tip of a cylindrical shaft with helical flutes; the flutes act as an
984:(TIR) less than 0.002 in (0.05 mm); and TIR < 0.0001 in (0.003 mm) is held in cylindrical grinding operations, as long as conditions are correct).
354:
The best geometry to use depends upon the properties of the material being drilled. The following table lists geometries recommended for some commonly drilled materials.
1274:
to cut large diameters and deep holes. Typical bit diameters are 6–14 in (150–360 mm) and hole depth from 12 in (300 mm) up to 71 feet (22 m).
1188:
Typically indexable drill bits are used in holes that are no deeper than about 5 times the bit diameter. They are capable of quite high axial loads and cut very fast.
963:(as explained in detail below). Nevertheless, because of the frequent lumping together of both the terminology and the tool use, suppliers may call center drill bits
1080:
amount which, depending on the reamers size, may be anything from 0.1 millimeter to perhaps a millimeter. A core drill bit may be used to double the size of a hole.
1589:
Both styles of auger bits were manufactured by several companies throughout the early- and mid-20th century, and are still available new from select sources today.
1016:
When drilling with a hand-held drill the flexibility of the bit is not the primary source of inaccuracy—it is the user's hands. Therefore, for such operations, a
806:
2040:
1576:
or solid-center auger bit is similar, the only difference being that one of the cutting edges has only a "vestigal flute" supporting it, which extends only about
347:
The diameter-to-length ratio of the drill bit is usually between 1:1 and 1:10. Much higher ratios are possible (e.g., "aircraft-length" twist bits, pressured-oil
1940:, and come with standard-size shanks, often with pre-installed stops to set them at an exact depth every time when being automatically chucked by the equipment.
270:
sized drills alongside the required screw tap sizes. There are also certain specialized drill bits that can create holes with a non-circular cross-section.
1228:
A spade drill bit for metal is a two part bit with a tool holder and an insertable tip, called an insert. The inserts come in various sizes that range from
3075:
1561:
The cutting principles of the auger bit are the same as those of the center bit above. The auger adds a long deep spiral flute for effective chip removal.
888:
in 1973. It was sold only by the Unibit
Corporation in the 1980s until the patent expired, and was later sold by other companies. Unibit is a trademark of
1705:
A Forstner bit could bore the mounting hole for the hinge, but particle board and MDF are very abrasive materials, and steel cutting edges soon wear. A
2497:
1489:
Bits are commonly available in sizes from 8–50 mm (0.3–2.0 in) diameter. Sawtooth bits are available up to 100 mm (4 in) diameter.
2221:
Swan et al (September 7, 2018). "Tool Wear of
Advanced Coated Tools in Drilling of CFRP." ASME. J. Manuf. Sci. Eng. November 2018; 140(11): 111018.
1177:
and other high precision or production equipment, and are the most expensive type of drill bit, costing the most per diameter and length. Like
2459:
515:
bits are inexpensive, but do not hold an edge well and require frequent sharpening. They are used only for drilling wood; even working with
1978:
1920:, which quickly wears steel bits, especially given the hundreds or thousands of holes on most circuit boards. To solve this problem, solid
1775:
The masonry bit shown here is a variation of the twist drill bit. The bulk of the tool is a relatively soft steel, and is machined with a
757:
materials. This style of bit requires a starter hole, but does not bind or suffer premature wear so long as a suitable feed rate is used.
1681:
The hinge sinker bit is an example of a custom drill bit design for a specific application. Many
European kitchen cabinets are made from
725:
Twist drill bits range in diameter from 0.002 to 3.5 in (0.051 to 88.900 mm) and can be as long as 25.5 in (650 mm).
562:
are variations on high-speed steel that contain more cobalt. They hold their hardness at much higher temperatures and are used to drill
1013:
a hole with a spot or center drill bit when a solid-carbide drill bit is used, it is best practice to do so after the hole is drilled.
947:
to provide a starting hole for a larger-sized drill bit or to make a conical indentation in the end of a workpiece in which to mount a
733:
is available for sharpening or reshaping cutting surfaces on twist drill bits in order to optimize the bit for a particular material.
2432:
332:
Twist drill bits are available in standard lengths, referred to as Stub-length or Screw-Machine-length (short), the extremely common
1527:
1358:. Intended for high speed use, they are used with electric hand drills. Spade bits are also sometimes referred to as "paddle bits".
3068:
2086:, so it can be flexed while drilling without breaking. This allows the bit to be curved inside walls, for example to drill through
1798:
type, which allows the bit to slide within the chuck when hammering, without the whole heavy chuck executing the hammering motion.
66:
If the information is appropriate for the lead of the article, this information should also be included in the body of the article.
1106:
cross-section and leave the inner cylinder of material (the "core") intact, often removing it, is also called a core drill bit or
667:(CFRP) and CFRP-Ti stack. (AlCrSi/Ti)N is a superhard ceramic coating, which performs better than other coated and uncoated drill.
3521:
1597:
600 mm (2.0 ft) long are available, where the chip-clearing capability is especially valuable for drilling deep holes.
1492:
Originally the
Forstner bit was very successful with gunsmiths because of its ability to drill an exceedingly smooth-sided hole.
243:, which powers them to cut through the workpiece, typically by rotation. The drill will grasp the upper end of a bit called the
3531:
2490:
1896:
Ceramic drill bits are made to drill through glazed and unglazed ceramic tiles, for instance for installing bathroom fittings.
59:
967:
in order to make it unambiguously clear what product is being ordered. They are numbered from 00 to 10 (smallest to largest).
706:
The modern-style twist drill bit was invented by Sir Joseph Whitworth in 1860. They were later improved by Steven A. Morse of
2345:
1442:
The spoon bit may be honed by using a slipstone on the inside of the cutting edge; the outside edge should never be touched.
3496:
3061:
2515:
1072:, a cylinder placed in a mould for a casting that leaves an irregular hole in the product. This core drill bit is solid.
344:
shanks are sometimes used. Other types of shank used include hex-shaped, and various proprietary quick release systems.
164:
2565:
1645:
1813:, similar in appearance and function to a hole punch or chisel, is used as a hand powered drill in conjunction with a
136:
2483:
2452:
2416:
2202:
1838:
183:
81:
1859:
1603:
1471:
Because of the flat bottom of the hole, they are useful for drilling through veneer already glued to add an inlay.
790:
566:
and other hard materials. The main disadvantage of cobalt steels is that they are more brittle than standard HSS.
1165:(either compressed air or a suitable liquid) to be injected through the drill's hollow body to the cutting face.
707:
664:
143:
959:. However, the true purpose of a center drill bit is the latter task, while the former task is best done with a
2756:
121:
659:
Al-Chrome Silicon Nitride (AlCrSi/Ti)N is a multilayer coating made of alternating nanolayer, developed using
2628:
1247:
Straight fluted drill bits do not have a helical twist like twist drill bits do. They are used when drilling
1831:
1060:
A bit used to enlarge an existing hole is called a core drill bit. The existing hole may be the result of a
3260:
2535:
2445:
1747:
uses screw threads and the other a twist bit for the pilot, the method of adjusting them remains the same.
150:
2287:
1825:. A star drill bit's cutting edge consists of several blades joined at the center to form a star pattern.
2678:
2603:
1956:
and expected feed per revolution are optimised for high-speed automated use on fiberglass PCB substrate.
977:
711:
2098:
This flexible installer bit is used in the US, but does not appear to be routinely available in Europe.
3578:
2919:
1929:
117:
38:
778:
340:
Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with
132:
3573:
3536:
2761:
2618:
1686:
1068:
or a stamped (punched) hole. The name comes from its first use, for drilling out the hole left by a
660:
636:
333:
2383:
595:
manufacturing, requiring many holes with diameters less than 1 mm, solid carbide bits are used.
3145:
3120:
2751:
2122:
2034:
Installer bits are available in various materials and styles for drilling wood, masonry and metal.
1345:
Brad point drill bits are ordinarily available in diameters from 3–16 mm (0.12–0.63 in).
259:
17:
534:
the material. If they are overheated (e.g., by frictional heating while drilling) they lose their
3501:
3491:
3486:
3037:
2841:
2826:
2766:
2728:
2668:
2407:
2170:
1657:
981:
744:
110:
2068:
Closeup of installer bit. The fishing hole is visible in the flute in the center of the picture.
1539:
1137:
Used almost exclusively for deep hole drilling of medium to large diameter holes (approximately
3526:
3516:
2871:
2851:
2746:
1944:
1761:
1615:
976:
removed from one process (perhaps turning in a lathe) and set up in a later process (perhaps a
889:
535:
351:, etc.), but the higher the ratio, the greater the technical challenge of producing good work.
3506:
2970:
2831:
2530:
2335:
2271:
1989:
1969:
1905:
1264:
1103:
1085:
592:
1847:
3568:
3546:
3541:
2955:
2861:
2560:
1962:
1909:
1904:
A great number of holes with small diameters of about 1 mm or less must be drilled in
1795:
1435:
to take the back spindles, or similar round-tenon work when assembling furniture frames in
1209:
their use is less common than when specialized machines were required for machining tasks.
1061:
873:
be used on very thin sheet metal, but metals tend to cause premature bit wear and dulling.
715:
1403:
687:
General-purpose drill bits can be used in wood, metal, plastic, and most other materials.
8:
3511:
3130:
2884:
2811:
2663:
1937:
1334:
In metal, the brad point drill bit is confined to drilling only the thinnest and softest
248:
910:
2975:
2781:
2738:
2643:
2506:
2022:
157:
1215:
are essentially left-hand bits of specialized shape, used to remove common right-hand
919:
hole. They can be used to make large holes in wood, sheet metal and other materials.
3012:
3007:
2545:
2412:
2341:
2243:
2231:
2198:
1467:
1436:
1040:
696:
653:
649:
1952:
equivalent cutting speed vs material resistance to the cut (hardness), as the bit's
3462:
3427:
3265:
2960:
2723:
2713:
2688:
2683:
2550:
2525:
1921:
1780:
1706:
1631:
The gimlet bit is a very old design. The bit is the same style as that used in the
951:. In either use, the name seems appropriate, as the bit is either establishing the
797:
738:
630:
577:
542:
491:
2260:(New and Revised ed.). The Caxton Publishing Company Ltd. pp. Vol i 136.
1017:
3150:
2658:
2593:
2588:
2192:
2132:
2127:
2107:
1985:
1871:
1776:
1521:
Center bits are made of relatively soft steel, and can be sharpened with a file.
1212:
1205:
861:
563:
448:
279:
267:
255:
1391:
1361:
Spade drill bits are ordinarily available in diameters from 6 to 36 mm, or
1322:, so even an ordinary twist drill bit will shear the edges of the hole cleanly.
844:
3422:
3280:
3245:
3205:
2934:
2894:
2816:
2693:
2405:
Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (2000),
1818:
1718:
1690:
1682:
1182:
1107:
1097:
615:
531:
530:
are more durable than low-carbon steel bits due to the properties conferred by
2361:
2166:
1204:
Left-hand bits are almost always twist bits and are predominantly used in the
3562:
3472:
3457:
3415:
3220:
3155:
3053:
2950:
2914:
2899:
2718:
2673:
2653:
2648:
2220:
2027:
1740:
1632:
1556:
1432:
1268:
1162:
1044:
A magnetic core drilling machine making hole with annular cutter (core drill)
821: in (8.7313 mm) drill bits - long-series morse, plain morse, jobber
263:
31:
538:, resulting in a soft cutting edge. These bits can be used on wood or metal.
3410:
3405:
3350:
3345:
3330:
3290:
3285:
3275:
3250:
3210:
3195:
3160:
2929:
2909:
2796:
2468:
2091:
2056: in × 18 in (9.5 mm × 457.2 mm) installer bit
1913:
1791:
1723:
1694:
1501:
948:
944:
730:
719:
487:
980:
operation) with a negligible loss in the co-axiality of features (usually
639:(TiAlN) is a similar coating that can extend tool life five or more times.
3447:
3310:
3295:
3235:
3185:
3180:
3165:
3140:
3115:
2879:
2806:
2698:
2608:
1431:
Parallel spoon bits are used primarily for boring holes in the seat of a
1339:
1335:
1123:
624:
341:
678:
BAlMgB14 is a superhard ceramic coating also used in composite drilling.
619:
Diamond-coated 2 mm bits, used for drilling materials such as glass
297:
speeds are traditionally used, and where the material has a tendency to
3467:
3437:
3355:
3270:
3225:
3032:
3027:
2904:
2821:
2613:
2079:
1953:
1917:
1673:
1255:
because they have less of a tendency to "dig in" or grab the material.
1021:
881:
the hole, more so than a spiral twist drill bit turning at high speed.
642:
Titanium carbon nitride (TiCN) is another coating also superior to TiN.
547:
430:
1196:
3380:
3320:
3240:
3170:
3125:
3022:
3017:
2985:
2980:
2801:
2791:
2776:
2708:
2276:, vol. 5, Modern Machining Publishing Company, 1899, p. 68.
2137:
2087:
2017:
1731:
1483:
1458:
1450:
1319:
1156:
932:
769:
675:
412:
348:
226:
215:
99:
3452:
3397:
3385:
3375:
3370:
3340:
3088:
2771:
2638:
2598:
2573:
1178:
905:
772:(through coolant drill) bits are preferred for deep hole drilling.
602:
520:
516:
302:
1515:
Some versions have two spurs. Some have two radial cutting edges.
1032:
62:
contains information that is not included elsewhere in the article
3442:
3392:
3365:
3360:
3335:
3255:
3230:
3084:
3042:
3002:
2924:
2856:
2786:
2703:
2142:
1822:
1784:
1743:
is usually provided to allow precise adjustment of the bit size.
1287:
1111:
1065:
1010:
587:
582:
298:
1735:
different size bits, as well as providing uncommon bit sizes. A
3315:
3200:
3135:
2889:
2846:
2836:
2540:
2437:
1933:
1814:
1248:
1076:
885:
865:
554:
306:
2386:, Benjamin Forstner, "Auger", published 1886-03-06
2021:
brick; they are not for drilling into wood. Sinclair Smith of
1564:
Two styles of auger bit are commonly used in hand braces: the
652:
has been used as a drill-bit coating for some tools under the
3432:
3305:
3215:
3110:
2965:
2578:
2083:
1736:
1698:
1533:
A 19 mm (3/4 inch) center bit, made sometime before 1950
1252:
1216:
700:
671:
559:
511:
394:
293:
240:
220:
196:
3300:
3190:
3100:
2167:"Practical demonstration of square-hole bit, YouTube video"
1020:
is often used to spot the hole center prior to drilling a
219:
Drill bit (upper left), mounted on a pistol-grip electric
3325:
3105:
1174:
943:, occasionally known as Slocombe drill bits, are used in
292:(or rate of twist) in the drill bit controls the rate of
1500:
The center bit is optimized for drilling in wood with a
970:
30:
For the types used in drilling holes in the ground, see
1102:
A hollow cylindrical bit which will cut a hole with an
748:
A 5 mm carbide bit displaying shallow point angle.
2404:
2316:
2304:
2191:
Todd, Robert H.; Allen, Dell K.; Alting, Leo (1994),
1697:boards are not very strong, and the screws of butt
1075:These core drill bits are similar in appearance to
124:. Unsourced material may be challenged and removed.
2411:(26th ed.), New York: Industrial Press Inc.,
1916:components. Most PCBs are made of highly abrasive
1161:Gun drills are straight fluted drills which allow
2382:
336:(medium), and Taper-length or Long-Series (long).
3560:
927:
2190:
1928:In industry, virtually all drilling is done by
1651:Gimlet bit for wood, made sometime before 1950.
987:
955:of a hole or making a conical hole for a lathe
301:on the bit or otherwise clog the hole, such as
3083:
1943:Very high rotational speeds—30,000 to 100,000
884:The unibit was invented by Harry C. Oakes and
3069:
2491:
2453:
1899:
1865:Rebar resistant bit with four carbide cutters
1787:into the steel to provide the cutting edges.
1504:. Many different designs have been produced.
2329:
2327:
2325:
1609:20 mm (0.79 in) auger bit for wood
284:Drill geometry has several characteristics:
2505:
1173:Indexable drill bits are primarily used in
3076:
3062:
2498:
2484:
2460:
2446:
1722:An adjustable wood bit meant for use in a
2340:, Industrial Press Inc., pp. 78–79,
2333:
2322:
2216:
2214:
2197:, Industrial Press Inc., pp. 43–48,
1593:commonly consist of #4-16 or #4-10 bits.
1311:which is optimized for drilling in wood.
184:Learn how and when to remove this message
82:Learn how and when to remove this message
2031:for this invention on January 25, 1898.
1717:
1672:
1457:
1449:
1286:
1195:
1039:
1031:
931:
909:
843:
743:
614:
486:
225:
214:
195:
2194:Manufacturing Processes Reference Guide
1790:Masonry bits typically are used with a
1713:
1052:is used for two quite different tools.
914:1.25 in (32 mm) hole saw bit.
14:
3561:
2373:McMaster-Carr, p. 2438, 116th edition.
2211:
1242:
1168:
877:and burr-free, especially in plastic.
523:can noticeably shorten their lifespan.
205:
3057:
2479:
2441:
2288:"US Patent: 38,119 - Twist Drill Bit"
2255:
2073:
1454:25 mm (1.0 in) Forstner bit
971:Use in making holes for lathe centers
1891:
1770:
1308:
1132:
209:
122:adding citations to reliable sources
93:
43:
2398:
1755:
1668:
1475:
857:
201:
24:
2101:
1882:
1750:
1355:
1223:
1117:
1091:
1088:) which may occur in the product.
1055:
690:
273:
25:
3590:
2426:
1779:rather than ground. An insert of
1348:
1282:
1027:
936:Center drill bits, numbers 1 to 6
826:
682:
2467:
2169:. Youtube.com. 18 October 2011.
2061:
2039:
1997:
1977:
1961:
1870:
1858:
1846:
1830:
1656:
1644:
1614:
1602:
1538:
1526:
1402:
1390:
1191:
1150:
1036:HSS core drills in various sizes
805:
789:
777:
98:
48:
2376:
2367:
2354:
2310:
2173:from the original on 2021-12-12
1988:(0.02 in or 0.51 mm)
1466:Forstner bits were patented by
1445:
1200:An 1/8 inch left-hand drill bit
965:combined-drill-and-countersinks
708:East Bridgewater, Massachusetts
665:carbon fiber reinforced polymer
663:technique, is used in drilling
109:needs additional citations for
2757:Electrical discharge machining
2546:Numerical control (NC and CNC)
2298:
2280:
2264:
2249:
2237:
2225:
2184:
2159:
2007:Installer bits, also known as
2002:
1291:A 10.5 mm brad point drill bit
13:
1:
2258:Engineering Workshop Practice
2148:
1626:
1495:
928:Center and spotting drill bit
784:Twist drill bit cutting edges
2153:
1550:
1414:
988:Use in spotting hole centers
922:
482:
260:drill bit and tap size chart
254:Drills come in standardized
7:
2604:List of drill and tap sizes
2116:
1677:30 mm hinge sinker bit
1277:
899:
610:
10:
3595:
2920:Magnetic switchable device
2334:Gillespie, Laroux (2008),
2105:
1900:PCB through-hole drill bit
1759:
1554:
1474:The bit includes a center
1262:
1154:
1121:
1095:
903:
277:
39:Drill bit (disambiguation)
36:
29:
3481:
3096:
2998:
2943:
2870:
2762:Electrochemical machining
2737:
2627:
2559:
2514:
2475:
1687:medium-density fiberboard
1258:
839:
661:chemical vapor deposition
637:Titanium aluminum nitride
570:
502:
3522:Machine and metalworking
2256:Judge, Arthur W (1947).
2123:Drill and tap size chart
1307:) is a variation of the
3532:Measuring and alignment
2842:Rotary transfer machine
2827:Photochemical machining
2767:Electron-beam machining
2729:Tool and cutter grinder
2337:Countersinking Handbook
1693:veneer. Those types of
1689:(MDF) with a laminated
1009:is deemed necessary to
982:total indicator reading
599:Polycrystalline diamond
532:hardening and tempering
230:A set of masonry drills
3261:Oxy-fuel cutting torch
1906:printed circuit boards
1762:Diamond core drill bit
1726:
1678:
1463:
1455:
1301:lip and spur drill bit
1292:
1201:
1045:
1037:
937:
915:
896:it is still produced.
890:Irwin Industrial Tools
849:
749:
737:drilled with standard
718:in the same manner as
620:
495:
231:
223:
212:
3038:Tools and terminology
2362:U.S. patent 3,758,222
1721:
1676:
1663:Gimlet bit tip detail
1555:Further information:
1545:Center bit tip detail
1461:
1453:
1318:Metals are typically
1290:
1265:Trepanning (drilling)
1199:
1179:indexable lathe tools
1043:
1035:
993:drilling is started.
935:
913:
847:
796:Twist drill bit with
747:
720:cutting helical gears
618:
593:printed circuit board
490:
229:
218:
199:
3497:Cutting and abrasive
2956:Machining vibrations
2862:Ultrasonic machining
2408:Machinery's Handbook
2082:instead of hardened
1910:electronic equipment
1802:existing buildings.
1714:Adjustable wood bits
1621:Auger bit tip detail
1462:Another Forstner bit
1297:brad point drill bit
118:improve this article
37:For other uses, see
27:Type of cutting tool
3131:Ceramic tile cutter
2976:Tool and die making
2664:Cylindrical grinder
2384:CA patent 23548
2307:, pp. 829, 846
2028:U.S. patent 597,750
1243:Straight fluted bit
1169:Indexable drill bit
546:(HSS) is a form of
363:Workpiece material
359:
2644:Abrasive machining
2074:Flexible shaft bit
2023:Brooklyn, New York
1930:automated machines
1727:
1679:
1639:side of the hole.
1464:
1456:
1293:
1202:
1046:
1038:
999:spotting drill bit
961:spotting drill bit
938:
916:
850:
848:A pair of unibits.
750:
621:
496:
357:
258:. A comprehensive
232:
224:
213:
3579:Woodworking tools
3556:
3555:
3051:
3050:
2994:
2993:
2347:978-0-8311-3318-4
2317:Oberg et al. 2000
2305:Oberg et al. 2000
1892:Ceramic drill bit
1771:Masonry drill bit
1468:Benjamin Forstner
1437:green woodworking
1338:, ideally with a
1133:Ejector drill bit
941:Center drill bits
714:wheel to cut the
703:out of the hole.
697:Archimedean screw
650:Zirconium nitride
528:high-carbon steel
480:
479:
372:Lip relief angle
329:functional length
210:twist drills bits
200:From top: Spade,
194:
193:
186:
168:
92:
91:
84:
16:(Redirected from
3586:
3574:Metallic objects
3463:Water jet cutter
3428:Sharpening stone
3266:Pencil sharpener
3078:
3071:
3064:
3055:
3054:
2961:Speeds and feeds
2714:Sharpening stone
2689:Grinding machine
2684:Grinding dresser
2551:Stewart platform
2500:
2493:
2486:
2477:
2476:
2462:
2455:
2448:
2439:
2438:
2422:
2399:Cited references
2393:
2392:
2391:
2387:
2380:
2374:
2371:
2365:
2364:
2358:
2352:
2351:
2331:
2320:
2314:
2308:
2302:
2296:
2295:
2284:
2278:
2277:
2273:Modern machinery
2268:
2262:
2261:
2253:
2247:
2241:
2235:
2229:
2223:
2218:
2209:
2208:
2188:
2182:
2181:
2179:
2178:
2163:
2065:
2055:
2054:
2050:
2043:
2030:
1981:
1965:
1922:tungsten carbide
1874:
1862:
1850:
1834:
1811:
1810:
1781:tungsten carbide
1756:Diamond core bit
1707:tungsten carbide
1669:Hinge sinker bit
1660:
1648:
1618:
1606:
1585:
1584:
1580:
1542:
1530:
1406:
1394:
1384:
1383:
1379:
1376:
1370:
1369:
1365:
1237:
1236:
1232:
1213:Screw extractors
1146:
1145:
1141:
856:(often called a
820:
819:
815:
809:
793:
781:
739:high-speed steel
631:Titanium nitride
578:Tungsten carbide
543:High-speed steel
494:coated twist bit
492:Titanium nitride
360:
356:
189:
182:
178:
175:
169:
167:
126:
102:
94:
87:
80:
76:
73:
67:
52:
51:
44:
21:
3594:
3593:
3589:
3588:
3587:
3585:
3584:
3583:
3559:
3558:
3557:
3552:
3551:
3477:
3151:Diagonal pliers
3092:
3082:
3052:
3047:
2990:
2939:
2866:
2733:
2724:Surface grinder
2659:Coated abrasive
2630:
2623:
2594:Drill bit sizes
2589:Drill bit shank
2564:
2555:
2517:
2510:
2504:
2471:
2466:
2429:
2419:
2401:
2396:
2389:
2381:
2377:
2372:
2368:
2360:
2359:
2355:
2348:
2332:
2323:
2315:
2311:
2303:
2299:
2286:
2285:
2281:
2270:
2269:
2265:
2254:
2250:
2242:
2238:
2230:
2226:
2219:
2212:
2205:
2189:
2185:
2176:
2174:
2165:
2164:
2160:
2156:
2151:
2133:Drill bit sizes
2128:Drill bit shank
2119:
2110:
2108:Drill bit shank
2104:
2102:Drill bit shank
2076:
2069:
2066:
2057:
2052:
2048:
2047:
2044:
2026:
2005:
2000:
1993:
1982:
1973:
1966:
1908:(PCBs) used by
1902:
1894:
1885:
1883:Glass drill bit
1878:
1875:
1866:
1863:
1854:
1853:Masonry bit tip
1851:
1842:
1837:25×500 mm
1835:
1808:
1807:
1773:
1764:
1758:
1753:
1751:Other materials
1716:
1671:
1664:
1661:
1652:
1649:
1629:
1622:
1619:
1610:
1607:
1582:
1578:
1577:
1559:
1553:
1546:
1543:
1534:
1531:
1498:
1448:
1417:
1410:
1407:
1398:
1395:
1381:
1377:
1374:
1372:
1367:
1363:
1362:
1356:bell-hanger bit
1351:
1309:twist drill bit
1305:dowel drill bit
1299:(also known as
1285:
1280:
1271:
1261:
1245:
1234:
1230:
1229:
1226:
1224:Metal spade bit
1194:
1183:milling cutters
1171:
1159:
1153:
1143:
1139:
1138:
1135:
1126:
1120:
1118:Countersink bit
1100:
1094:
1092:Extracting core
1058:
1056:Enlarging holes
1030:
990:
973:
930:
925:
908:
902:
860:) is a roughly
842:
829:
822:
817:
813:
812:
810:
801:
794:
785:
782:
693:
691:Twist drill bit
685:
670:BAM coating is
613:
573:
564:stainless steel
526:Bits made from
505:
485:
467:
451:
449:Stainless steel
433:
415:
397:
379:
282:
280:Drill bit sizes
276:
274:Characteristics
256:drill bit sizes
190:
179:
173:
170:
127:
125:
115:
103:
88:
77:
71:
68:
65:
57:This article's
53:
49:
42:
35:
28:
23:
22:
15:
12:
11:
5:
3592:
3582:
3581:
3576:
3571:
3554:
3553:
3550:
3549:
3544:
3539:
3534:
3529:
3524:
3519:
3514:
3509:
3504:
3499:
3494:
3489:
3487:Types of tools
3483:
3482:
3479:
3478:
3476:
3475:
3470:
3465:
3460:
3455:
3450:
3445:
3440:
3435:
3430:
3425:
3423:Sharpening jig
3420:
3419:
3418:
3413:
3408:
3400:
3395:
3390:
3389:
3388:
3383:
3378:
3373:
3368:
3363:
3358:
3353:
3348:
3343:
3338:
3333:
3323:
3318:
3313:
3308:
3303:
3298:
3293:
3288:
3283:
3278:
3273:
3268:
3263:
3258:
3253:
3248:
3246:Milling cutter
3243:
3238:
3233:
3228:
3223:
3218:
3213:
3208:
3206:Grinding wheel
3203:
3198:
3193:
3188:
3183:
3178:
3173:
3168:
3163:
3158:
3153:
3148:
3143:
3138:
3133:
3128:
3123:
3118:
3113:
3108:
3103:
3097:
3094:
3093:
3081:
3080:
3073:
3066:
3058:
3049:
3048:
3046:
3045:
3040:
3035:
3030:
3025:
3020:
3015:
3010:
3005:
2999:
2996:
2995:
2992:
2991:
2989:
2988:
2983:
2978:
2973:
2968:
2963:
2958:
2953:
2947:
2945:
2941:
2940:
2938:
2937:
2932:
2927:
2922:
2917:
2912:
2907:
2902:
2897:
2892:
2887:
2882:
2876:
2874:
2868:
2867:
2865:
2864:
2859:
2854:
2849:
2844:
2839:
2834:
2829:
2824:
2819:
2817:Milling cutter
2814:
2809:
2804:
2799:
2794:
2789:
2784:
2779:
2774:
2769:
2764:
2759:
2754:
2749:
2743:
2741:
2735:
2734:
2732:
2731:
2726:
2721:
2716:
2711:
2706:
2701:
2696:
2694:Grinding wheel
2691:
2686:
2681:
2676:
2671:
2666:
2661:
2656:
2651:
2646:
2641:
2635:
2633:
2625:
2624:
2622:
2621:
2616:
2611:
2606:
2601:
2596:
2591:
2586:
2581:
2576:
2570:
2568:
2557:
2556:
2554:
2553:
2548:
2543:
2538:
2533:
2528:
2522:
2520:
2516:Computer-aided
2512:
2511:
2503:
2502:
2495:
2488:
2480:
2473:
2472:
2465:
2464:
2457:
2450:
2442:
2436:
2435:
2428:
2427:External links
2425:
2424:
2423:
2417:
2400:
2397:
2395:
2394:
2375:
2366:
2353:
2346:
2321:
2309:
2297:
2292:www.datamp.org
2279:
2263:
2248:
2236:
2224:
2210:
2203:
2183:
2157:
2155:
2152:
2150:
2147:
2146:
2145:
2140:
2135:
2130:
2125:
2118:
2115:
2106:Main article:
2103:
2100:
2075:
2072:
2071:
2070:
2067:
2060:
2058:
2045:
2038:
2004:
2001:
1999:
1996:
1995:
1994:
1983:
1976:
1974:
1967:
1960:
1936:rather than a
1901:
1898:
1893:
1890:
1884:
1881:
1880:
1879:
1876:
1869:
1867:
1864:
1857:
1855:
1852:
1845:
1843:
1836:
1829:
1817:to drill into
1809:star drill bit
1772:
1769:
1760:Main article:
1757:
1754:
1752:
1749:
1715:
1712:
1691:melamine resin
1683:particle board
1670:
1667:
1666:
1665:
1662:
1655:
1653:
1650:
1643:
1628:
1625:
1624:
1623:
1620:
1613:
1611:
1608:
1601:
1552:
1549:
1548:
1547:
1544:
1537:
1535:
1532:
1525:
1497:
1494:
1447:
1444:
1416:
1413:
1412:
1411:
1409:Tiny spade bit
1408:
1401:
1399:
1396:
1389:
1350:
1349:Wood spade bit
1347:
1284:
1283:Brad point bit
1281:
1279:
1276:
1260:
1257:
1244:
1241:
1225:
1222:
1193:
1190:
1170:
1167:
1155:Main article:
1152:
1149:
1134:
1131:
1122:Main article:
1119:
1116:
1108:annular cutter
1098:Annular cutter
1096:Main article:
1093:
1090:
1057:
1054:
1050:core drill bit
1029:
1028:Core drill bit
1026:
1003:spot drill bit
989:
986:
972:
969:
929:
926:
924:
921:
904:Main article:
901:
898:
858:step drill bit
841:
838:
833:step drill bit
828:
827:Step drill bit
825:
824:
823:
811:
804:
802:
795:
788:
786:
783:
776:
692:
689:
684:
683:Universal bits
681:
680:
679:
668:
657:
647:
643:
640:
634:
628:
612:
609:
608:
607:
596:
572:
569:
568:
567:
551:
539:
524:
504:
501:
484:
481:
478:
477:
474:
471:
468:
465:
462:
461:
458:
455:
452:
447:
444:
443:
440:
437:
434:
429:
426:
425:
422:
419:
416:
411:
408:
407:
404:
401:
398:
393:
390:
389:
386:
383:
380:
377:
374:
373:
370:
367:
364:
358:Tool geometry
349:gun drill bits
338:
337:
325:
317:
310:
275:
272:
192:
191:
106:
104:
97:
90:
89:
56:
54:
47:
26:
9:
6:
4:
3:
2:
3591:
3580:
3577:
3575:
3572:
3570:
3567:
3566:
3564:
3548:
3545:
3543:
3540:
3538:
3535:
3533:
3530:
3528:
3525:
3523:
3520:
3518:
3515:
3513:
3510:
3508:
3505:
3503:
3500:
3498:
3495:
3493:
3490:
3488:
3485:
3484:
3480:
3474:
3473:Wire stripper
3471:
3469:
3466:
3464:
3461:
3459:
3458:Utility knife
3456:
3454:
3451:
3449:
3446:
3444:
3441:
3439:
3436:
3434:
3431:
3429:
3426:
3424:
3421:
3417:
3414:
3412:
3409:
3407:
3404:
3403:
3401:
3399:
3396:
3394:
3391:
3387:
3384:
3382:
3379:
3377:
3374:
3372:
3369:
3367:
3364:
3362:
3359:
3357:
3354:
3352:
3349:
3347:
3344:
3342:
3339:
3337:
3334:
3332:
3329:
3328:
3327:
3324:
3322:
3319:
3317:
3314:
3312:
3309:
3307:
3304:
3302:
3299:
3297:
3294:
3292:
3289:
3287:
3284:
3282:
3281:Plasma cutter
3279:
3277:
3274:
3272:
3269:
3267:
3264:
3262:
3259:
3257:
3254:
3252:
3249:
3247:
3244:
3242:
3239:
3237:
3234:
3232:
3229:
3227:
3224:
3222:
3219:
3217:
3214:
3212:
3209:
3207:
3204:
3202:
3199:
3197:
3194:
3192:
3189:
3187:
3184:
3182:
3179:
3177:
3174:
3172:
3169:
3167:
3164:
3162:
3159:
3157:
3156:Diamond blade
3154:
3152:
3149:
3147:
3144:
3142:
3139:
3137:
3134:
3132:
3129:
3127:
3124:
3122:
3119:
3117:
3114:
3112:
3109:
3107:
3104:
3102:
3099:
3098:
3095:
3090:
3086:
3079:
3074:
3072:
3067:
3065:
3060:
3059:
3056:
3044:
3041:
3039:
3036:
3034:
3031:
3029:
3026:
3024:
3021:
3019:
3016:
3014:
3011:
3009:
3006:
3004:
3001:
3000:
2997:
2987:
2984:
2982:
2979:
2977:
2974:
2972:
2969:
2967:
2964:
2962:
2959:
2957:
2954:
2952:
2951:Cutting fluid
2949:
2948:
2946:
2942:
2936:
2933:
2931:
2928:
2926:
2923:
2921:
2918:
2916:
2915:Machine taper
2913:
2911:
2908:
2906:
2903:
2901:
2900:Indexing head
2898:
2896:
2893:
2891:
2888:
2886:
2883:
2881:
2878:
2877:
2875:
2873:
2872:Machine tools
2869:
2863:
2860:
2858:
2855:
2853:
2850:
2848:
2845:
2843:
2840:
2838:
2835:
2833:
2830:
2828:
2825:
2823:
2820:
2818:
2815:
2813:
2810:
2808:
2805:
2803:
2800:
2798:
2795:
2793:
2790:
2788:
2785:
2783:
2780:
2778:
2775:
2773:
2770:
2768:
2765:
2763:
2760:
2758:
2755:
2753:
2750:
2748:
2745:
2744:
2742:
2740:
2736:
2730:
2727:
2725:
2722:
2720:
2719:Spark testing
2717:
2715:
2712:
2710:
2707:
2705:
2702:
2700:
2697:
2695:
2692:
2690:
2687:
2685:
2682:
2680:
2677:
2675:
2674:Flick grinder
2672:
2670:
2669:Diamond plate
2667:
2665:
2662:
2660:
2657:
2655:
2654:Bench grinder
2652:
2650:
2649:Angle grinder
2647:
2645:
2642:
2640:
2637:
2636:
2634:
2632:
2626:
2620:
2617:
2615:
2612:
2610:
2607:
2605:
2602:
2600:
2597:
2595:
2592:
2590:
2587:
2585:
2582:
2580:
2577:
2575:
2572:
2571:
2569:
2567:
2562:
2558:
2552:
2549:
2547:
2544:
2542:
2539:
2537:
2534:
2532:
2529:
2527:
2524:
2523:
2521:
2519:
2513:
2509:and computing
2508:
2501:
2496:
2494:
2489:
2487:
2482:
2481:
2478:
2474:
2470:
2463:
2458:
2456:
2451:
2449:
2444:
2443:
2440:
2434:
2431:
2430:
2420:
2418:0-8311-2635-3
2414:
2410:
2409:
2403:
2402:
2385:
2379:
2370:
2363:
2357:
2349:
2343:
2339:
2338:
2330:
2328:
2326:
2319:, p. 846
2318:
2313:
2306:
2301:
2293:
2289:
2283:
2275:
2274:
2267:
2259:
2252:
2246:
2240:
2234:
2228:
2222:
2217:
2215:
2206:
2204:0-8311-3049-0
2200:
2196:
2195:
2187:
2172:
2168:
2162:
2158:
2144:
2141:
2139:
2136:
2134:
2131:
2129:
2126:
2124:
2121:
2120:
2114:
2109:
2099:
2096:
2093:
2089:
2085:
2081:
2064:
2059:
2042:
2037:
2036:
2035:
2032:
2029:
2024:
2019:
2014:
2010:
1998:Installer bit
1991:
1987:
1980:
1975:
1971:
1964:
1959:
1958:
1957:
1955:
1949:
1946:
1941:
1939:
1935:
1931:
1926:
1923:
1919:
1915:
1911:
1907:
1897:
1889:
1873:
1868:
1861:
1856:
1849:
1844:
1840:
1833:
1828:
1827:
1826:
1824:
1820:
1816:
1812:
1803:
1799:
1797:
1793:
1788:
1786:
1782:
1778:
1768:
1763:
1748:
1744:
1742:
1741:vernier scale
1738:
1733:
1725:
1720:
1711:
1708:
1703:
1700:
1696:
1692:
1688:
1684:
1675:
1659:
1654:
1647:
1642:
1641:
1640:
1636:
1634:
1617:
1612:
1605:
1600:
1599:
1598:
1594:
1590:
1587:
1575:
1570:
1567:
1562:
1558:
1557:Auger (drill)
1541:
1536:
1529:
1524:
1523:
1522:
1519:
1516:
1513:
1509:
1505:
1503:
1493:
1490:
1487:
1485:
1480:
1477:
1472:
1469:
1460:
1452:
1443:
1440:
1438:
1434:
1433:Windsor chair
1429:
1425:
1421:
1405:
1400:
1393:
1388:
1387:
1386:
1359:
1357:
1346:
1343:
1341:
1337:
1332:
1328:
1325:
1321:
1316:
1312:
1310:
1306:
1302:
1298:
1289:
1275:
1270:
1269:Cranial drill
1266:
1256:
1254:
1250:
1240:
1221:
1218:
1214:
1210:
1207:
1198:
1192:Left-hand bit
1189:
1186:
1184:
1180:
1176:
1166:
1164:
1163:cutting fluid
1158:
1151:Gun drill bit
1148:
1130:
1125:
1115:
1113:
1109:
1105:
1099:
1089:
1087:
1081:
1078:
1073:
1071:
1067:
1063:
1053:
1051:
1042:
1034:
1025:
1023:
1019:
1014:
1012:
1006:
1004:
1000:
994:
985:
983:
979:
968:
966:
962:
958:
954:
950:
946:
942:
934:
920:
912:
907:
897:
893:
891:
887:
882:
878:
874:
870:
867:
863:
859:
855:
846:
837:
834:
808:
803:
799:
792:
787:
780:
775:
774:
773:
771:
766:
762:
758:
754:
746:
742:
740:
734:
732:
726:
723:
721:
717:
713:
709:
704:
702:
698:
688:
677:
673:
669:
666:
662:
658:
655:
651:
648:
644:
641:
638:
635:
632:
629:
626:
623:
622:
617:
604:
600:
597:
594:
589:
584:
580:
579:
575:
574:
565:
561:
558:
556:
552:
549:
545:
544:
540:
537:
533:
529:
525:
522:
518:
514:
513:
507:
506:
500:
493:
489:
475:
472:
469:
464:
463:
459:
456:
453:
450:
446:
445:
441:
438:
435:
432:
428:
427:
423:
420:
417:
414:
410:
409:
405:
402:
399:
396:
392:
391:
387:
384:
381:
376:
375:
371:
368:
365:
362:
361:
355:
352:
350:
345:
343:
335:
334:Jobber-length
330:
326:
322:
318:
315:
311:
308:
304:
300:
295:
291:
287:
286:
285:
281:
271:
269:
265:
261:
257:
252:
250:
246:
242:
237:
228:
222:
217:
211:
207:
203:
198:
188:
185:
177:
166:
163:
159:
156:
152:
149:
145:
142:
138:
135: –
134:
130:
129:Find sources:
123:
119:
113:
112:
107:This article
105:
101:
96:
95:
86:
83:
75:
63:
61:
55:
46:
45:
40:
33:
32:Well drilling
19:
3351:Concrete saw
3346:Circular saw
3331:Abrasive saw
3291:Pocket knife
3276:Pizza cutter
3251:Nail clipper
3211:Honing steel
3196:Glass cutter
3175:
3161:Diamond tool
3146:Cutting tool
2930:Rotary table
2910:Lathe center
2797:Machine tool
2629:Grinding and
2583:
2469:Metalworking
2433:Nomenclature
2406:
2378:
2369:
2356:
2336:
2312:
2300:
2291:
2282:
2272:
2266:
2257:
2251:
2239:
2227:
2193:
2186:
2175:. Retrieved
2161:
2111:
2097:
2092:light switch
2080:spring steel
2077:
2033:
2012:
2008:
2006:
1950:
1942:
1927:
1914:through-hole
1903:
1895:
1886:
1806:
1804:
1800:
1792:hammer drill
1789:
1774:
1765:
1745:
1728:
1704:
1695:pressed wood
1680:
1637:
1630:
1595:
1591:
1588:
1573:
1571:
1565:
1563:
1560:
1520:
1517:
1514:
1510:
1506:
1499:
1491:
1488:
1481:
1473:
1465:
1446:Forstner bit
1441:
1430:
1426:
1422:
1418:
1360:
1352:
1344:
1336:sheet metals
1333:
1329:
1323:
1317:
1313:
1304:
1300:
1296:
1294:
1272:
1246:
1227:
1211:
1203:
1187:
1172:
1160:
1136:
1127:
1101:
1082:
1074:
1070:foundry core
1069:
1059:
1049:
1047:
1018:center punch
1015:
1007:
1002:
998:
995:
991:
974:
964:
960:
956:
952:
949:lathe center
945:metalworking
940:
939:
917:
894:
883:
879:
875:
871:
853:
851:
832:
830:
764:
763:
759:
755:
751:
735:
731:tool grinder
727:
724:
705:
694:
686:
598:
576:
553:
541:
527:
519:rather than
509:
497:
369:Helix angle
366:Point angle
353:
346:
339:
328:
320:
313:
289:
283:
253:
244:
235:
233:
180:
171:
161:
154:
147:
140:
128:
116:Please help
111:verification
108:
78:
69:
60:lead section
58:
3569:Hole making
3547:Woodworking
3448:Switchblade
3311:Razor strop
3296:Putty knife
3236:Meat slicer
3181:Emery cloth
3166:Disc cutter
3141:Countersink
3116:Bolt cutter
3008:Fabrication
2944:Terminology
2880:Angle plate
2807:Metal lathe
2699:Jig grinder
2609:Tap and die
2518:engineering
2025:was issued
2009:bell-hanger
2003:Fishing bit
1992:drill bits.
1972:drill bits.
1841:masonry bit
1340:drill press
1124:Countersink
864:bit with a
798:Morse taper
765:Long series
656:brand name.
625:Black oxide
510:low-carbon
499:hand-held.
314:point angle
133:"Drill bit"
72:August 2023
3563:Categories
3468:Wire brush
3438:Steel wool
3356:Coping saw
3271:Pipecutter
3226:Lawn mower
3028:Metallurgy
2822:Pantograph
2614:Tap wrench
2177:2014-05-10
2149:References
1954:rake angle
1918:fiberglass
1877:Star drill
1627:Gimlet bit
1502:hand brace
1496:Center bit
1476:brad point
1397:Spade bits
1263:See also:
1206:repetition
1022:pilot hole
674:-Aluminum-
646:workpiece.
581:and other
548:tool steel
431:Mild steel
278:See also:
202:brad point
144:newspapers
3381:Miter saw
3321:Sandpaper
3241:Mezzaluna
3176:Drill bit
3171:Drawknife
3126:Burnisher
3023:Machining
3018:Jewellery
2986:Workpiece
2981:Tramp oil
2971:Tolerance
2802:Machining
2792:Jig borer
2777:Engraving
2752:Broaching
2739:Machining
2619:Threading
2584:Drill bit
2566:threading
2507:Machining
2154:Citations
2138:Drill rod
2018:fish tape
1984:A box of
1732:set screw
1569:century.
1551:Auger bit
1484:end grain
1415:Spoon bit
1320:isotropic
1157:Gun drill
1048:The term
923:For metal
866:stairstep
770:gun drill
699:and lift
676:Magnesium
654:Craftsman
521:softwoods
517:hardwoods
483:Materials
413:Cast iron
321:lip angle
236:drill bit
174:July 2021
3502:Forestry
3492:Cleaning
3453:Tool bit
3402:Scraper
3398:Scissors
3386:Wire saw
3376:Hole saw
3371:Hand saw
3341:Chainsaw
3089:abrasive
3033:Smithing
2772:End mill
2679:Grinding
2639:Abrasive
2599:Drilling
2574:Die head
2561:Drilling
2171:Archived
2117:See also
2011:bits or
1839:SDS-plus
1566:Jennings
1385:inches.
1278:For wood
978:grinding
906:Hole saw
900:Hole saw
886:patented
753:dig in.
712:grinding
611:Coatings
603:sintered
583:carbides
466:Plastics
454:118–135
436:118–135
378:Aluminum
303:aluminum
268:imperial
18:Drillbit
3527:Masonry
3517:Kitchen
3443:Surform
3393:Scalpel
3366:Hacksaw
3361:Fretsaw
3336:Bandsaw
3256:Nibbler
3231:Machete
3085:Cutting
3043:Welding
3013:Forming
3003:Casting
2935:Wiggler
2925:Mandrel
2895:Fixture
2857:Turning
2852:Skiving
2812:Milling
2787:Hobbing
2709:Sanding
2704:Lapping
2631:lapping
2143:Endmill
2090:from a
2051:⁄
2013:fishing
1823:masonry
1581:⁄
1512:chips.
1380:⁄
1366:⁄
1233:⁄
1142:⁄
1104:annular
1077:reamers
1066:casting
1064:from a
1011:chamfer
862:conical
816:⁄
418:90–118
400:90–118
382:90–135
342:tapered
247:in the
206:masonry
158:scholar
3537:Mining
3507:Garden
3316:Reamer
3201:Grater
3136:Chisel
3121:Broach
2890:Collet
2847:Shaper
2837:Reamer
2832:Planer
2782:Facing
2747:Boring
2541:G-code
2415:
2390:
2344:
2201:
1934:collet
1815:hammer
1785:brazed
1699:hinges
1633:gimlet
1439:work.
1303:, and
1259:Trepan
1249:copper
1217:screws
1112:strata
1001:(or a
957:center
953:center
854:unibit
840:Unibit
741:bits.
716:flutes
588:brazed
571:Others
560:alloys
555:Cobalt
536:temper
503:Steels
476:12–26
470:60–90
457:24–32
439:24–32
421:24–32
406:12–26
388:12–26
385:32–48
307:copper
290:spiral
264:metric
262:lists
208:, and
160:
153:
146:
139:
131:
3542:Power
3433:Snips
3416:Paint
3306:Razor
3286:Plane
3221:Laser
3216:Knife
3111:Blade
3091:tools
2966:Swarf
2885:Chuck
2579:Drill
2245:ASME.
2233:ASME.
2088:studs
2084:steel
1938:chuck
1912:with
1819:stone
1737:ruler
1724:brace
1574:Irwin
1253:brass
1086:flash
800:shank
701:swarf
672:Boron
557:steel
512:steel
508:Soft
473:0–20
460:7–24
442:7–24
424:7–20
403:0–20
395:Brass
249:chuck
245:shank
241:drill
221:drill
165:JSTOR
151:books
3512:Hand
3411:Hand
3406:Card
3301:Rasp
3191:Froe
3186:File
3101:Adze
3087:and
2526:2.5D
2413:ISBN
2342:ISBN
2199:ISBN
1968:Two
1821:and
1777:mill
1572:The
1324:Wood
1295:The
1267:and
1181:and
1062:core
327:The
319:The
312:The
299:gall
294:chip
288:The
266:and
137:news
3326:Saw
3106:Axe
2905:Jig
2563:and
2536:CAM
2531:CAD
1990:PCB
1986:#76
1970:PCB
1945:RPM
1796:SDS
1783:is
1739:or
1685:or
1371:to
1251:or
1175:CNC
305:or
120:by
3565::
2324:^
2290:.
2213:^
2046:A
1805:A
1486:.
1235:16
1114:.
1024:.
892:.
852:A
831:A
818:32
814:11
722:.
251:.
234:A
204:,
3077:e
3070:t
3063:v
2499:e
2492:t
2485:v
2461:e
2454:t
2447:v
2421:.
2350:.
2294:.
2207:.
2180:.
2053:8
2049:3
1583:2
1579:1
1382:2
1378:1
1375:+
1373:1
1368:4
1364:1
1231:7
1144:4
1140:3
309:.
187:)
181:(
176:)
172:(
162:·
155:·
148:·
141:·
114:.
85:)
79:(
74:)
70:(
64:.
41:.
34:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
