How to choose a screwdriver

Screwdriver - one of the most popular tools in any home. It is needed not only during construction or major repairs, but also in various everyday situations, which often arise in our lives. One has only to run into a couple of times, for example, the need to assemble a wardrobe, or change the lock, it becomes clear that without a screwdriver is necessary. And then the question arises: how to choose a screwdriver? Product range to date, very broad, but how to find the perfect tool for yourself? The first thing to pay attention to basic characteristics of screwdrivers. So the important parameters are the speed and torque. For domestic use rather screwdriver with a torque of 10 - 15 Nm, which allows you to tighten the screws tight. Wrenches with high torque are considered universal, since they allow to carry out the function and drilling hard materials. In professional tools it can reach up to 130 Nm. The choice of speed is also associated with what the complexity of the problem will be solved. To tighten the screws enough speed to 400-500 rpm. Drilling requires a minimum of 1200-1300 rpm. The high rate is required only in exceptional cases. Now let's look at the gearbox. This element allows the rotation shaft tool with a certain angular velocity. For screwing up enough of 500 rpm, for normal drilling - from 1200 to 1500 rpm. Usually Cordless Screwdrivers planetary gear set with plastic gears satellites. When choosing naturally the question arises as a professional tool to buy or household. The main differences in capacity and uptime before recharging. At home both are significantly smaller, but with ordinary situations in everyday screwdriver handle without any problems. And they cost much less, respectively. Professional tool makes sense to buy if you firmly know that will be faced with high loads. Before buying also need to be defined with the type of battery will be at your screwdriver. It can be a nickel-cadmium (Ni-Cd), Nickel-Metal Hydride (Ni-MH) or lithium-ion (Li-Ion). Household batteries are often equipped with nickel-cadmium batteries. Most of them are calculated for 1000 zaryadok, whereas Ni-MH battery - 500. Now there is a screwdriver that can support both types of batteries. The big downside of these batteries is the so-called memory effect: for each charge if the battery has not been fully discharged, its capacity decreases. Avoid this and still operate the tool without unexpected interruptions to the availability of a replacement will recharge the battery. Lithium ion batteries do not suffer from memory effect. In addition, they are considered more environmentally friendly because they do not contain cadmium, harmful to human health. But this battery Li-Ion worse tolerate temperatures below zero. In addition, there are battery-operated screwdrivers network. Their disadvantage is that the limited access area long cord. In addition, such wrenches harder. The choice of the power tool is preferable if a lot of work and it is associated with the processing of solid materials. We are touched upon only the most basic parameters that play an important role in selecting the screwdriver. More may be added that, of course, when buying an instrument, we must pay attention to its shape and position of the handle. Screwdriver, like any tool, should lie comfortably in your hand. Choosing between the pistol grip type and located at the center of gravity of the tool, it is better to prefer the latter, because this arrangement is less hand fatigue. Regarding the choice of the brand and the availability of all sorts of additional functions have screwdriver, it all depends on personal preferences and physical capabilities.