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[D683]Drill Bits For Concrete

by David H. Urmann, Dav

Drill bits have different types and kinds. Some drill bits are used for making starting hole. Some of them are used for soft materials and others are built for hard ones. There are also drill bits used to enlarge holes or for finishing purposes. These drill bits types are the center drill bits, the twist drill bits, and the core drill bits.

The Twist Drill Bits
The twist drill bits are applied to drill holes on various materials such as plastics, woods, or metals. These twist drill bits are available in many sizes. The common sizes of the twist drill bits are from 0.05 mm in length up to 100 mm in length. These sizes are used to describe the diameter of the hole covered by the twist drill bits.

For example the twist drill bits size 0.05 mm covers the two over one thousand millimeter (0.002 mm) diameter of hole and the twist drill bits size 100 mm covers the hole with diameter measures four millimeter (4 mm). The twist drill bits also have a size of 1000 millimeter (1000 mm) in length which covers the hole with diameter of 39 millimeter (39 mm). This size is used for powered hand tools.

The point angle of the twist drill bits is also considered. Different point angle of the twist drill bits has diverse applications. The one hundred eighteen (118) degree point angle of twist drill bits is the most flexible point angle. These twist drill bits can be used in many purposes. However, there are point angle of the twist drill bits made for specialized and specific task.

Twist drill bits without point angle are for the making holes with flat-bottoms. These are so sensitive in terms of positioning as any slight movement while drilling may cause in undesirable outcome.

The twist drill bits with ninety (90) degree point angle are used to create holes on very soft plastics. These types are very sharp and could produce starting hole for itself.

The one hundred fifty (150) degree point angle of twist drill bits are made for creating holes on hard materials like metals. These twist drill bits require a starting hole which can be obtained by means of center drill bits for easy operation and fine results.

The Center Drill Bits
The center drill bits are available in sizes one to six These are commonly used in working with hard materials like metal. The center drill bits have two (2) main purposes. First is for crafting a starting hole for the twist drill bits with 150 degree point angle, for reamer drill bits, for core drill bits, or for any larger drill bits. Meaning, the center drill bits applied for outlining a center hole for making bigger hole or use as preparation for making hole in hard materials. Second is for creating conical indentation to build up a lathe center for a piece of work.

The Core Drill Bits
The core drill bits are solid. Like reamer drill bits, core drill bits can not create starting hole because they do not have a cutting point. However, core drill bits have three or four flutes. The flutes improve the finish of the hole and ensure fine bit cuts.

The core drill bits have two main functions. It can be used for enlarging the hole or starting hole, and could double the size of the hole unlike the reamer drill bits. It can also be used for finishing purposes. It is possible to achieve perfect rounded shape holes due to the flutes of the core drill bits.

Adjustable bit: comes with an adjustable cutter to bore holes of varying sizes. Used for drilling holes for piping or wiring where a rough cut is acceptable.

Around-the-corner bit: to cut curved holes in tight corners with an angled cutting surface.

Auger Bits: designed to drill holes in wooden material. The drilling end has a screw head so that the bit can self feed.

Brad-point drills: similar to standard bits but have a sharpened point that makes it easier to start in wood. Drills cleaner holes than a spade bit.

Counterbore: a drill bit which permits a screw to be driven beneath the woods surface. The hole can then be filled with a plug.

Countersink bit: has an angled tip that's designed to form a depression for screw heads.

Drill Saw bit: Used to cut holes in metal and wood. Can enlarge existing holes.

Expansion bit: another term for adjustable bit. An expansion bit uses an adjustable cutter to bore holes of varying sizes.

Fly Cutter: used on a drill press to cut circles. The diameter of the circles can be adjusted by changing the cutter setting.

Forstner Bit: used to a create a flat bottomed hole in wood, a mortise can be formed by cutting overlapping holes. Also used to a create a segment of a hole at the edge of a board. Use only in a drill press.

Glass bit: has a carbide tip for drilling through glass.

Hole saws: cuts holes from 1" to 6" in diameter, have a center bit for guiding the cutting edge of the saw.
Masonry bits: have carbide tips for drilling holes in masonry, use at speeds below 400rpm.

MultiSpur bit: drills holes large enough to run pipe or conduit through. A threaded screw in the center of the cutting circle pulls the work towards the cutting edge.
Nail Spinner: used to start finishing nails, prevents wood from splintering as it is driven in. A hammer is used to finish the job.

Reamer Bit: a tapered bit that can be used to fit into an existing hole either to enlarge it.

Rotary Files: used for the same purpose as a conventional file, great for expanding holes in metal and cleaning up rough edges.

Paint Mixers: consist of a shaft with fan type blades. Put the shaft into the paint before rotating to avoid splatter.

Plastic Bit: has a tip that prevents splintering when drilling in plastic. Drill slowly and reduce pressure as you reach the other side of you work.

Plug Cutter: can be used to cut out cylindrical shapes from wood. These small cylindrical plugs are used to cover screw heads. This bit should only be used in drill press.

Screw driving bits: used for driving screws.
Screw Pilot bit: used to drill a pilot hole, body hole and countersink all at the same time.

Spade bit: has a sharpened point and used for drilling large diameter holes in wood. These bits work best at fast drilling speeds, but remember to start slowly.

Step Bit: a tapered bit with up to 13 diameters as the bit penetrates the work it drills a hole with an increasingly large diameter.

Twist drills: standard drill bits, used for drilling small diameter holes in wood and metal.

Wire Brushes: used to clean up metal, remove rust. Available as either a cup or a wheel with wire brush on the rim.

Woodscrew bit: available in a variety of sizes to match particular screw sizes. Woodscrews are used to drill a pilot hole, body hole and countersink all at the same time.

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