The electric drill, a tool used to make holes in concrete, wood, metal, acrylic and other surfaces, is very useful in the professional use and in the household to repair in the house, install a shelf, and hang a panel among numerous other possibilities. Whatever the situation is, the electric drill is a must-have item. There are many options to drill, ranging in power, impact, voltage, chuck size, shape, brand and others. Therefore, when purchasing a drill, the ideal is to consider factors such as usage, type of work and the surface you want to drill, how often to use the tool and other criteria. From there, it becomes easier to find the right drill to your needs.
The power drill is directly linked to the type of work to be done and should be the first criteria to be evaluated. For professional use, the drills with power more than 700 W are recommended. As for light work or low frequency of use, choose the drills with power between 300W and 700W, holing concrete, hollow bricks, block and wood. For home use, always try to turn on the power drill with the hardness of the material to be drilled. The construction of buildings has been made with ready – mix concrete, more solid and resistant, which asks for a drill with higher power. In such cases, the ideal is a drill with power above 700 W or Gavel 5 kg that comes with punch function with impact.
The drills are available with impact and no impact. The most common is the use of the drill with impact, used to stick wood, concrete, masonry etc. Already without impact it is used in industries and works with fragile surfaces such as glass and metal, which require more precision.
Note the mandrel and nozzle that holds the drill. There are some chuck sizes: ½ “, 3/8”, 5/8 “. The mandrel size is related to the power of the drill and the drill diameter. For example, a mandrel 3/8” supports a drill to 10 mm; already arbors with larger diameters can withstand drills up to 14 mm. The mandrel is replaceable, but the exchange of the part must be made in the same size to ensure proper operation.
Some drill models have two speeds to suit different situations of use. The first speed is slower, fit for very hard materials. The speed 2 is faster and used for softer surfaces such as wood, or perforation of the concrete. When drill concrete, we use the machine impact system: the more times per minute the machine hit (rpm) to break the best concrete, so the speed 2 is most appropriate in this situation. Another advantage of some models is the variable speed reversible or VVR. This feature allows you to stick to the surfaces and remove the drill attached to the material.
The drills, made from metal rods, are responsible for the drilling. For each surface, wood, concrete or metal, you need a special type of drill. As previously mentioned, the drill must be appropriate to chuck capacity. For the work to be appropriate, one should always respect the drill-chuck-screw interface. The screw should be compatible to the size of the bushing which in turn must be equal to the size of the drill, avoiding that the hole be larger than the screw.
There are drills with the screwdriver function. These models allow not only stick to the surface, but also secure the screws on the surface.