Since the invention of the cordless drill, the type and number of bits available have become nearly boundless. The utility of this new tool a few years ago opened up many new uses for the old reliable drill. They have become nut and screw drivers. As battery strength and duration has improved along with more powerful motors, the cordless drill has moved into many other areas that drills were never expected to be used. A consideration of drill bits, types and tips now runs the gamut of the construction field.
Bits are used to make the drill into a driver.
From drywall to auto mechanics, using drill bits to replace old hand tools has become the trend. There are all types of screw driver bits for drills. Even Allen wrench bits exist. One quick trip to the tool aisle of the discount or hardware store will demonstrate the scores of drill bits that now are available. If the drill can fit into the space, there will be a drill bit to do the job. Not only are there a variety of types to choose from, but there is a wide range of quality. You can get these bits in inexpensive softer steel or more expensive hardened steel and brass.
Besides being a standard screw driver, drill bits can turn the cordless drill into a wrench with nut driving bits.
This type of bit comes in nearly every size of hex fitting available. They are available in metric and SAE. You can get these drill bits with round shanks or hex shank s which are often preferred because the jaws of the drill can grip them tighter. These hex drill bits are only limited by the strength of the cordless or corded drill as to what size nut or bolt they can handle.
Drill bits can pierce concrete.
Specialized drill bits can be used to bore holes into concrete. These are especially handy when you need to make holes for screw anchors in a wall or floor. They can also be used to make openings up to a half inch or larger all of the way through a slab of concrete if needed. These bits look like a corkscrew more than a drill bit. Usually the tips are like horizontal knives that rip into the concrete when the speed of the drill along with pressure is used. As long as these bits are sharp, they will make clean holes for any purpose.
Wood bits are made to bore cleanly into wood or similar materials.
These bits are quite distinctive in appearance. Unlike the concrete bits which have some resemblance to a standard drill bit, the wood bit is a straight shank with a flared end. The tip of the wood bit looks like two flat wings with their tips turned down and a central knife to make the initial pierce into the wood. Larger wood bits that drill holes of 1 inch or more usually require that the bit be used at a little lower speed to give the knives time to do their work. The bit is like a plane that scrapes away the wood layer by layer as it bores a hole.
Standard drill bits are used to make holes in metal or hard materials.
What most people visualize when they hear someone mention drill bits is the standard metal bits. They usually have hardened tips that have two sharp edges that can eat into most metals that are not harder than the bit. It is important to know what type of material that you will be using these bits on so that an appropriate hardness can be obtained. These bits need to be replaced when they start to dull, or you will risk damaging your drill by placing too much stress on it. Metal cutting bits can be recognized by their straight shaft from end to end. They appear to be threaded with exceptional coarse threads. The edges of the threads are actually sharpened to facilitate cutting.
Drill bits can be used to cut holes in doors to insert door knobs.
The bits used to do this job look like a saw blade that has been bent into a circle and fastened to a standard drill bit. Some of them have adjustments to allow them to cut larger or smaller openings in doors. These bits are able to saw through a door and leave about a 2 inch or larger opening. If the door is thick, it might require drilling half way through from each side to make the complete opening.
All drill bits can come in longer sizes and harder metals
For jobs that require the drill bit to allow for the drill to be held back somewhat from the opening, a longer shank is needed. This is roughly the equivalent of using an extension on a socket with a ratchet. This type of bit will also allow you to drill through thicker materials although it is rare to need them for this unless you work in a field that requires it. Drill bits can come with the tips or the entire shank hardened to make them pierce through hardened metals. Sometimes even a diamond tip is required for exceptionally hard materials..