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Drills. Electric drills were introduced in the 19th century, and in 1917, Black & Decker patented the first pistol-shaped, trigger-controlled electric drill these resembled what is now seen in modern power drills. Pistol grip electric  drills are now common tools, being used for all sorts of projects that range from large-scale construction to DIY work around the home.


Thanks to the enormous advances in portable batteries such as lithium ion technology, Cordless drills no longer need to source electricity through a cord that is plugged into an electrical outlet. Despite this development, corded drills still remain in popular use.


These days the two types of drills share the same basic features, such as a torque-driven turning mechanism that operates in forward and in reverse and compatibility with interchangeable drill bits of various sizes and designs.


Drill Types


Before comparing corded drills and cordless drills, it is useful to break down the different drill types that are common to both categories of power drills. There are five in all: standard drills, hammer drills, rotary hammer drills, impact drills, and right angle drills. Each of these types of power drill is available in corded and cordless models, and this section will describe the defining feature of each power drill type.


Standard Drill


A corded or cordless standard drill is shaped like a large pistol, with a drill bit on the end and a trigger on the drill handle that powers the bit. They are the most basic type of drill and they can be used in the widest variety of situations. Standard drills are good for both drilling holes and for driving screws. Those that need basic drilling and screw-driving capability should consider this type of drill.


Hammer Drill


A corded or cordless hammer drill looks much like a standard drill does by virtue of having the same pistol-shape. However, the hammer drill has the added function of driving the drill bit like a hammer. In addition to regular torque-driven drilling, a clutch rapidly draws the drill bit slightly back and drives it forward to create quick and powerful hammering action. This is useful for masonry that requires drilling into stone since the hammering action drives the drill bit into the stone more efficiently than torque-driven drilling would. Hammer drills are unnecessary for those who work with wood since a standard drill is generally sufficient to work with this softer material.


Rotary Hammer Drill


A corded or cordless rotary hammer drill is a subtype of a hammer drill. It offers the same hammering action, but it uses a piston instead of a clutch to drive the drill bit back and forth and to rotate it as it does so. This rotation action makes the hammering more powerful and efficient, allowing users to drill holes into stone more quickly and with less effort than they could with a regular hammer drill. Rotary hammer drills are therefore ideal for larger masonry jobs.


Impact Drill


A corded or cordless impact drill has a stubbier look to it than the other types of drills described above do. It has a handle, but the drill body is relatively short. Impact drills are also without a chuck, which is the piece that turns the drill bit on standard drills. Instead, they have vise grips that hold the drill bit, giving these drills greater torque and control than standard drills have. This results in less stripped screws, less effort to drill, and greater command over drilling, which is necessary in fine carpentry. Standard drills are suitable for most jobs, but those that need extra control and a little more power should consider an impact drill.


Right Angle Drill


A corded or cordless right angle drill functions much like a standard drill does, but it has an extraordinarily short body with the handle located practically beneath the drill bit. These drills are designed to operate in tight spaces that standard drills cannot fit into, such as small cabinets.

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