The drill-driver is a hybrid device that can not only tighten fasteners, but also drill holes. We explain how such devices differ from most conventional screwdrivers, and how to choose the model that is suitable for your tasks.
How is a drill / driver different from a conventional screwdriver?
A conventional screwdriver is designed exclusively for screwing / unscrewing screws, self-tapping screws and other fasteners. We have already written about the features of choosing cordless screwdrivers, so we will not repeat ourselves. We only note that such a power tool operates at low speed (although there are high-speed models), but with a large torque. Thanks to the high torque, even the most stubborn screws can be loosened. Nominally, “shura” are equipped with cartridges for a bat.
The screwdriver has at least two speeds: one low for screwing in, and one high for drilling. If the device has several speeds, this does not mean that you have a drill-driver in front of you. Their main difference is the drilling mode. Drill screwdrivers are equipped with a chuck (quick-clamping or specialized), in which drills can be clamped. Also, the characteristics indicate the diameters of the holes that the device is capable of drilling in metal and wood.
Cordless or cordless drill / screwdriver: which one to take?
The main advantages of network devices over battery ones are higher power (with other parameters being equal) and the ability to work for a long time (no need to take recharging breaks). Although the second advantage loses its relevance if you buy a spare battery for the rechargeable model. Among other things, network models are somewhat cheaper (if we consider the products of one brand).
Of the minuses, we note the lack of autonomy (it will not work without electricity) and the need to carry the power cord along (in hard-to-reach places this can create real inconveniences). Perhaps for some, these factors will not be so critical: for example, for those who plan to use a drill / screwdriver around the house or in a furniture assembly workshop. If this is your case, we recommend taking from the network Makita HP0300 – It has a good build, a decent torque of 56 Nm and a hammer drilling mode.
How to choose a cordless drill / screwdriver for your home? It is better to take models with a lithium (Li-Ion) battery, since unlike nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH), it does not have a “memory effect” and does not need to be completely discharged to reverse charging. Also, with the same dimensions, lithium batteries have a higher capacity. To save on the second battery, we recommend taking Bosch GSR 180-LI, which comes with two 18-volt lithium batteries with a capacity of 2 A * h. This model is often included in the rating of cordless drills and screwdrivers for reliability.
What to look for when choosing a screwdriver drill?
This function allows you to tailor the torque to specific applications. For example, for screwing screws into dense wood, a high torque is needed, and for fastening drywall, a low torque is needed so as not to damage the material.
Note that the torque adjustment is available absolutely in all drills, since it is, in fact, the drilling mode is set with the help of the cuff. The difference in models can only be in the number of positions. If you have to work with many materials of different density, you should take with a large number of modes, which will make it possible to configure the device as accurately as possible. If you need a device to buy for a banal home repair, you can ignore the quantity.
In drills, the impact mode can be of two types: drilling with impact and twisting with impact. When twisting, the impulse impact increases the force, and the self-tapping screw goes faster and deeper, even if the material is very dense. In drilling mode, hammering increases the pressing force of the drill, so drilling in metal and wood is faster. The exponential performance of the shock mode can be seen in the powerful DeWALT DCD996P2, which is able to drill holes with a diameter of 15 mm in metal, and up to 55 mm in wood.
True, the shock mode is not needed in all works. For example, it is rarely used to assemble furniture, so carpenters will not need it. But for drilling interior walls, it really comes in handy.
Some devices have a mechanism that brakes the motor immediately after the power button is turned off. Thanks to this, the chuck with the attachment stops almost instantly and the device does not have to be held for a long time. It is especially important that heavy models weighing 2 kg or more have this function, since during long-term operation such “waiting” for the chuck to stop can greatly tire the hand.
A safety clutch is quite rare, and even then only in battery models. For example, it is in Bosch GSR 18V-60, and reusable. Please note that some models have an overload clutch but are listed as “electronic motor protection” in the product data sheet. If the reliability of the device and the durability of the engine are important to you, take the model with a safety clutch.
It is also called a brushless motor. The main feature of such a motor is a higher efficiency in comparison with brushed ones, that is, lower energy consumption for the same useful power. If power consumption is not so important for network models, because there is always power supply, then for battery models it is a significant indicator. Devices with a brushless motor use less power but deliver excellent power. A striking representative of brushless devices is a powerful German drill-driver AEG BSB 18CBL, which can drill not only metal and wood, but also concrete.
Another advantage of brushless motors is the absence of sparking, which is useful when working in fire-hazardous areas. Brushless motors are not cheap models, so if you have a limited budget, it is better to take a closer look at models with a brushed motor.
If you need drill-driver for repairs in an apartment and infrequent part-time jobs, take an inexpensive network model up to 3000 – 4000 rubles. To assemble furniture, you will need a network device with a torque control so that it can be adjusted to different wood densities.
If you need device for frequent work, then it is definitely worth taking a rechargeable device with a lithium battery (look at the proposals where 2 – 3 batteries are included in the kit at once). For heavy work, use with impact mode and overload clutch. From experience, we will say that it is better to spend a little, but immediately take a good model that will last a long time than constantly repairing a cheap “no-name”.
Especially for those who are going to be overhauled: