How to choose a drill?
Of all the power tools, the most popular for the home master is a drill. With the help of this tool, any work associated with the repair or assembly, performed many times easier and several times faster than without it. Equally important is the question of what kind of drill to choose a home craftsman, so that the tool does not cost too much, and at the same time, with his help you could choose all the necessary homework. There are several selection criteria, and it is useful to get acquainted with them, before you go to the hardware store.
Selection depending on the scope of work
- If the tool is purchased for use in long-term repair or for other purposes associated with frequent and prolonged use, you should opt for a professional drill. In this category, the professional tools themselves are divided, and the “semi-professional” ones, produced in the countries of Southeast Asia.
- If the technique will be rarely used, it is worth buying a cheaper drill designed for domestic use.The resource of such tools is much lower and they are not designed for continuous operation, however, their price is much lower than that of professional tools.
Torque and speed
- Before you choose a drill, the home craftsman should estimate for what purposes it will be primarily used. For each material, a certain rotational speed is optimal. If the holes are drilled in metal and wood, it is necessary to stop the choice on a high-speed drill (2000-2500 rpm). If the drill will be used as a screwdriver, or for drilling in concrete or brick, lower speeds (500-1000 rpm) will be needed. For universal use, it is worth buying a drill with a speed regulator, and the most convenient option is a smooth adjustment.
- Under the torque is the force with which the electric motor is able to rotate the drill, that is, its power. This value can vary from 300 to 1500 watts. If you need to choose a drill for the house, then the power of 500-700 W will be sufficient. For professional purposes, it is better to stay on more powerful models. The choice of this criterion is also influenced by the maximum diameter of the holes to be drilled.It should be borne in mind that not every household wiring can withstand the load that consumes a powerful professional drill.
- If in places where the drill will be used, there is access to a power outlet, it is hardly optimal to use a self-powered drill. Moreover, its cost compared to normal, is usually higher.
- If you choose a cordless drill, you just need to use the tool outside the power supply network, you should stop the choice on models with nickel-cadmium 12-volt batteries (Ni-Cd). Compared to nickel-metal hydride (Ni-MH) batteries, they are more common in Russia, have slightly larger dimensions, however, they withstand high currents better and are more resistant to negative temperatures.
- Professional cordless drills are usually equipped with two batteries for alternate charging. In this case, the performance of such batteries is restored in about 60 minutes. In household tools, batteries are fully charged for a period of 3 to 7 hours.
- If volumetric construction works are being undertaken, at which holes are supposed to be made in materials that are difficult to drill, such as concrete or stone, you should choose a hammer drill or a perforator. If the holes in such materials are supposed to be drilled rarely, you can purchase a drill with the ability to turn off the impact mechanism. When drilling hard, but fragile materials, such as, for example, porcelain stoneware or tile, you should choose a percussion mechanism with a low or adjustable impact force. In such cases, a drill with a precision drilling mechanism is also used.
- In modern drills are used two types of cartridges - fast-clamping and gear. In the last drill is attached with a special key. In the quick-release chucks in order to fasten the drill enough small effort hands. In some models, you can use a removable cartridge.
- Dimensions and weight of the instrument can be quite significant for home use. The compact and ergonomic tool will be more convenient when drilling holes in hard to reach places.A convenient case allows compact storage of the instrument along with accessories.