Choosing a cordless drill-screwdrivers and drills

Each master is familiar with such a useful tool as a screwdriver. It saves you from the monotonous work of tightening screws and other fasteners manually. But why limit yourself to simple functionality, when the modern market of power tools is able to provide such an excellent sample as a cordless drill / driver.

Benefits

Let's give a simple example. When working with solid wood you needed to fasten several elements. Most often for this purpose self-tapping screws are used, but before you screw them into a hard surface, you have to “drill” it, for the best passage of the screw.

Thus, you already use several devices.So why create additional inconvenience when all the necessary functions can be combined in one drill with a battery? Convenient device has autonomy, which eliminates tangling or damage to the wires at the most inopportune moment.

Someone may say: "A conventional screwdriver can handle the wood and drywall completely." Yes, this statement is not devoid of meaning. In everyday affairs there will be a rather small and compact tool, but everything changes during the repair.

A mini-drill with battery can withstand loads such as:

• drilling bricks;
• work with concrete;
• creating holes in solid surfaces at a difficult angle;

A simple screwdriver simply can not cope with such solid loads. Although the functions hammer drill may not be useful, it is useful to have on hand such a device.

Battery used

Powerful drill-driver is powered by a certain type of battery. In total there are three types:

• nickel cadmium;
• nickel metal hydride;
• lithium ion.

Nickel-cadmium (Ni-Cd)

These batteries are inexpensive, but this is where their advantages end:

• memory effect;
• high self-discharge;
• limited number of charge-discharge cycles (only 1000 times).

These are the brightest cons of the battery presented. Batteries of this type are unreliable, often fail and quickly become unusable.

Cordless Drill 12V Stayer SCD-12

Nickel metal hydride (Ni-MH)

This type of battery is far superior to nickel-cadmium in almost all indicators. But despite this, it is quite difficult to find the screwdrivers equipped with these batteries.

Cordless Impact Drill DeWALT DC 745 KB

Lithium Ion (Li-Ion)

Lithium Ion batteries are the most advanced and reliable. With the same weight, lithium is three times less than its Ni-Cd analog. On average, such a battery will last nine years, withstanding over three thousand charge-discharge cycles.

Such a battery is not recommended to completely discharge, therefore, in modern devices it is provided automatic discharge protection system. The downside can be an overestimated cost of the battery, but, given the long service life, the costs fully justify themselves.

Rechargeable drill / screwdriver Bort BAB-10,8Nx2Li-FDK

Voltage

If we talk about stress - the higher, the more effective. For normal work is enough fourteen volts. Some prefer eighteen to have a small margin.

Battery capacity is usually measured in ampere hours - A / h. The duration of the autonomous session depends on this indicator.

In general, the efficiency of the device will be equal to the capacity multiplied by the battery voltage. A drill-screwdriver with a capacity of three ampere-hour and a battery strength of fourteen volts will work more efficiently than the same tool with an eighteen volt voltage, but a capacity of two ampere-hour. High charging speed in this case does not matter. But extra batteryincluded in the kit will be a good help.

Drill-screwdriver BOSCH GSR 1440 Li with two batteries

Used motor

The element that drives the entire system is of two types - without the use of brushes and with the use of these parts. Brushless view it has many advantages:

• almost silent work and smooth immersion;
• increased work period;
• low battery consumption;
• maintenance free mechanism.

Brushless motor drill

If you choose brush drill, pay attention to access to the brushes. They should be easily removed and replaced with new ones without any problems. Consumables will repeatedly require replacement, so this aspect is very important. Make sure that the windings in the device are at least several pairs.

An important indicator is considered spinning moment. This parameter is measured in Newton meters - special units that demonstrate the complexity of the work available to this model of screwdriver. The minimum threshold in this case is twenty Newton meters. The higher this figure, the more efficient the mini-drill works.

An important indicator is the configuration, strength and compactness of the case, as well as individual design developments of each tool.

Brand value

Unknown class tools - no-name buying is not worth it.When choosing the right mini drill for you, consider already established brands on the market that have authority and history. The most popular, both among amateurs and professionals, are the following brands:

• Makita;
• Bosch;
• Hitachi;

Drill rechargeable Hitachi DS14DCL-RA

Rechargeable drill from Makita characterized by high reliability, Hitachi boasts original design solutions, and the German brand AEG is known for its meticulous approach to production and strict adherence to international quality standards. Bosch is trying not to deviate from the company's traditional policy - value for money.

A little about the price. The most profitable option is to purchase a mini drill at a special fair, so to speak, from the hands of the manufacturer. In the profile store, such a tool can be found at a price. up to ten thousand rubles. Everything will depend on the required functionality and brand.

Do not be greedy and buy low-quality counterparts. As a rule, such devices do not work for long and fail in a matter of weeks.

Cordless drills

It is hard to believe, but even such a powerful device as a punch can be rechargeable.They can easily perform tasks such as:

• hammer drilling, and the procedure can be carried out for a long time;
• drilling holes for mounting materials;
• jackhammer functions (in the presence of special nozzles).

At the same time, the cordless perforator is compact, devoid of wires and much more convenient to use. Powerful battery it is fixed directly on the case, providing freedom of action and independence from connection to the electrical network.

Makita BHR262RDJ cordless hammer drill

The device uses the same type of battery as the mini-drill, but somewhat larger in size and capacity. A standalone punch easily replaces the bulky power tool, and replaceable batteries ensure trouble-free operation for up to three hours.

Wireless punch can be of two types:

• electromagnetic;
• pneumatic.

The devices operate based on different principles, but perform the tasks assigned to them equally well. Choosing a punch, pay attention to such parameters as:

• installed engine power;
• impact strength;
• drill size;
• speed of cartridge turns;
• massiveness;
• the number of beats per minute.

The device is ideally suited for work on difficult construction sites without access to electricity.

Modern technologies make life much easier and create real miracles. Every year the tools are becoming more and more effective, but their price is also growing. The best models of cordless drills are quite expensive, but you can always find a simpler and cheaper model.