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A drill is a tool fitted with a cutting tool attachment or driving tool attachment, usually a drill bit or driver bit, used for boring holes in various materials or fastening various materials together with the use of fasteners. The attachment is gripped by a chuck at one end of the drill and rotated while pressed against the target material. The tip, and sometimes edges, of the cutting tool does the work of cutting into the target material. This may be slicing off thin shavings (twist drills or auger bits), grinding off small particles (oil drilling), crushing and removing pieces of the workpiece (SDS masonry drill), countersinking, counterboring, or other operations.
Drills are commonly used in woodworking, metalworking, construction and do-it-yourself projects. Specially designed drills are also used in medicine, space missions and other applications. Drills are available with a wide variety of performance characteristics, such as power and capacity.    WIKIPEDIA

Corded Hammer Drills have a wide range of uses. Corded drills are powered directly by plugging into the main electricity supply and this means that extra care must taken regarding safety. 
1. The cord is carefully laid out so that it cannot trip the person using the drill. 
2. It is good practice to use a circuit breaker. This will cut power if any electrical fault in the drill occurs. 
3. Always wear safety goggles to protect the eyes. Never operate equipment like this without eye protection.

4. When using a corded drill hold both the normal handle and front handle securely. This will help steady the drill as it vibrates during use. It also allows the user to put pressure against the drill as it is used to drill holes in difficult materials.
5. The person using the drill should space their feet apart. This helps the person balance and lean into the drill, applying his/her weight safely.
6. Always check that electrical wires or water pipes are not in the area of intended drilling. Drilling through an electrical wire can be extremely dangerous.
7. Always seek instruction / training from an appropriately qualified instructor before using any tools, especially power tools.
  A basic corded drill is shown below. Even basic drills are provided with accessories. For instance, corded drills usually have a front handle that can be fitted if required. It is strongly recommended that the front handle is fitted as it provides extra support an makes it more likely that the drill will be used safely. If both hands are holding the drill then it is impossible for the user to accidentally place his /her hand in the way of the drill whilst it is in use.

  The drill speed (rpm, revolutions per minute) can be changed according to the material being drilled. On the example shown above the speed is changed by turning the dial on the on/off switch. This will vary depending on the model of drill being used.

 A. The drill bit is changed by using a chuck key to loosen the chuck. The bit is normally changed if a larger diameter is needed OR a different type of drill bit. For example, a normal HSS drill bit is use to drill wood / metals. However, for masonry and brick / stone a ‘masonry’ bit is required.

B. Safety / self-locking chucks are very common. These do not need a chuck key and are used by simply turning the chuck and the barrel by hand, in opposite directions. The drill bit locks in position.

Most corded drills will have at least two basic settings - normal and hammer. This allows the drill to be used on a range of materials such as natural woods, manmade boards, metals, masonry, brick and stone.

When drilling materials such as natural woods and manmade boards the ‘normal’ setting is correct. When this setting is used the drill bit rotates in a clockwise direction cutting into the wood. Metals are drilled with the same setting.

 When drilling materials such as masonry and brick the ‘hammer’ setting is correct. When this setting is used the drill bit rotates in a clockwise direction but is also driven backwards and forward into the material at great speed. The drill vibrates as it is ‘hammered’ through the material.
When drilling a difficult material such as stone. Fit a masonry drill bit and start drilling on a normal setting. Once a small hole has been started, switch to the ‘hammer’ setting. If the ‘hammer’ setting is used right at the beginning, the drill bit can slip as it vibrates at high speed.

For more information, please visit this related link:  Technology Student .

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