how to choose the correct screwdriver

How to choose a screwdriver

While seemingly simple operations such as screwing the screws in the process of repair or other work , it takes a lot of time and effort , given that the number of screws can be quite large. To free from unnecessary costs helps to fine -proven device that is designed exactly for this purpose , called the screwdriver . Its acquisition is especially important if you plan to work on the construction of drywall constructions in which multiple connections are fixed with screws.

We will try to figure out how to choose among that numerous shurpovert range, which offers the consumer market today.

Let’s start with the fact that the value of many of the characteristics that define the quality of this product and its reliability, and determines the price of a particular model , as well as the basic direction of its intended use , which implies a one-time standard apartment repair or conduct of professional construction and repair work when the screwdriver used daily and with great intensity.

Main technical data to which you should pay attention

When choosing a particular model screwdriver pay attention to its technical characteristics , among which are:

the torque value , which characterizes the force with which the mechanism is able to tighten the screws;
frequency of rotation of the working head , which expresses the speed through the number of revolutions per minute;
Chuck type for tips and drills ;
material and manufacturing quality gear ;
kind of self-contained power source .

Before choosing a particular model is to determine the amount of money that you are willing to spend to buy , as well as to the purposes for which you acquire this tool . This is due to the fact that the devices with the best indicators that are used by professional construction teams are of high quality and reliability, but are much more expensive than domestic models, designed for occasional use in private.

To carry out domestic work by screwing the screws and work with soft materials should be fine low-cost model with a low value of the torque is 10-15 Nm . If you plan on working with harder materials , and in the long term , it is appropriate to buy a semi- professional model or screwdriver in which the torque can reach up to 100-130 Nm . In the more expensive and high quality models have a significant number of steps to ensure change in the value of torque and allow you to vary torque screws , helping to avoid excessive recess deep into the material .

Likewise is the case with the value the speed of the tool bit . Screw -in thread model is right for you with a minimum speed of 400-500 revolutions / min. If you want to buy a universal model and intend to use the screwdriver as a drill , the engine speed should be higher and range from 1,000 to 1,500 rev / min , which is typical for professional models of the device. Very handy screwdrivers with having control of this indicator , which allows you to switch a low rotation speed at the start of drilling on the higher in future work . The quality of gear used in the model determines the characteristics of the mechanism are listed . In -powered drivers typically uses a planetary gear unit in which the satellite gears are made of durable plastic.

In addition to the more expensive models use a switch-off function after the rotational inertia of the head off the screwdriver . Another no less useful feature is the reverse or reverse , which allows you to twist the screws are tight in the removal or release the stuck drill .

Basically, as holders for tips and drills powered drivers used the keyless chuck with shank diameter of 10 mm , but in the models , requiring on drilling in light concrete , complemented function whipping used 13 mm cartridge .

Advantages and disadvantages of cordless screwdrivers

Before choosing a cordless drill , weigh the pros and cons of purchasing just this type of instrument . If you need to be near the power supply will not be limited to the normal operation of your instrument , and its mobility is less important than the performance of work of high complexity , it is necessary to give the advantage of screwdrivers, which is powered from the mains.

With a high degree of mobility and the apparent convenience of cordless screwdrivers have a number of disadvantages:

mount the battery to the body of the device significantly increases its weight and size, whereas when the canopy is not convenient ;
to the extent that the battery begins to lose its initial charge , the power tool is greatly reduced, which negatively affects the quality of his work ;
when the battery is low, then we have some time to wait for her partial charge ;
over time while the battery is reduced, which requires more frequent recharging and further purchase of a new power supply.

If you think it is necessary to purchase a cordless screwdriver , then try to decide on the how to choose a screwdriver that is able to work remotely from the mains.

Among the main parameters of the battery , which could affect the choice of a particular model :

voltage, which varies from 9.6 to 24 volts and determines not only the power of the entire device , but also a time of readiness to work in offline mode. But at the same time increasing the voltage gives more weight to the battery , and prolonged holding in the hands of this factor is not the last ;
the ratio between the strength of current and time, the higher the value , the longer your battery will hold a charge ;
type of battery that can be lithium -ion (Li-Ion), nickel- cadmium (Ni-Cd) or nickel metal hydride (Ni-MH). Each type has its own advantages and disadvantages . Ni-MH batteries are designed for minimal amount of recharging , an average of 500 cycles , have smaller dimensions , and do not contain toxic hazardous contaminants such as Ni-Cd, which in turn is kept to 1000 recharges . In addition, this type of battery is poorly responsive to high currents . Not having a negative effect memory Li-Ion batteries are able to provide more power , but they do not tolerate very low temperatures and are quite expensive.

Manufacturers are trying to find a way to address the shortcomings when dealing with this type of instrument , constantly finding new ways to optimize the operation of autonomous power sources . Newer models are already used batteries with a fractional charge mode when one of the two bundled battery is working and the second at this time charging that gives the ability to provide continuity in the work.

Combining all the above characteristics with their inquiries , estimating screwdriver design and ergonomics when using the tool , you can make a decent choice and not to give up on him in the course of further work.