How choose best drill driver

Types of drill drivers:

The market presents a huge number of drill drivers, different in parameters and manufacturers. They are divided into professional and household, depending on the battery, the size of the cartridge, the power, a number of additional functions, the delivery kit and the price. This division, however, is inherent in almost any instrument.

First, we will analyze the division by the battery. You can distinguish two types: rechargeable (Li-Ion, Ni-Cd, Ni-Mh) and electric, we’ll discuss each of them below.

Li-Ion batteries

Li-Ion batteries

Li-Ion batteries

The most modern and most common,  type of batteries, not only in drill driver, but in many other tools (as well as in portable devices that we all use with you). Modern Li-Ion batteries are designed for three thousand charge-discharge cycles. The battery is lightweight and fast enough to charge, in addition, has no memory to charge.

The main drawbacks are: the battery life of the battery, which is three years, the need for constant use, to get the most out and significant cost.

Tip: Battery of this type are designed for permanent use, and therefore, to maximize the possibilities it is desirable to take them not for one-time works! It is also worth noting that Li-Ion batteries are not very desirable to recharge and discharge completely, a stable discharge of up to 15% and charge up to 90% will significantly prolong the life of the battery. Three charge-discharge cycles in a row will allow you to calibrate the battery capacity to maximum.

 

Ni-Cd batteries

They appeared on the market quite a long time, they are used in many instruments, not only in drill driver. Calculated for 1500 charge-discharge cycles. The shelf life of such batteries is five years, there is also the possibility of working in the cold, at temperatures up to -15 degrees and is very important for the average buyer, the lowest price of all types of batteries.

Negative moments of this type of battery is a long enough, in time, charging process (at best an hour), the presence of memory to the charge and the significant weight of the battery.

Tip: Since batteries of this type have memory to charge, you should take the rule of fully charging and discharging them, thereby not reducing their service life. Full charge will be taken by the charger, and a full discharge can be achieved, for example, using a flashlight, which is very often found in the delivery of screwdrivers with Ni-Cd batteries. In case there is no flashlight, you can tighten the button with an ordinary rubber band and after a while the screwdriver will discharge itself. Keep this type of battery is recommended discharged.

Ni-Cd batteries

Ni-Cd batteries

Ni-Mh rechargeable batteries

In its essence, there is something in between Li-Ion and Ni-Cd batteries. They are found in drill drivers much less often than the types of batteries described above. The number of charge-discharge cycles varies about a one thousand. Virtually has no memory to charge, and has minimal self-discharge among all types of batteries. Of the minuses, we can not fail to note the high weight.

Tip: This type of battery is almost rid of the memory effect, but still, before using the drill driver, after long-term storage, it should be discharged, and then re-charged for further use. For long-term storage batteries of this type should be left fully charged.

Ni-Mh rechargeable batteries

Ni-Mh rechargeable batteries

All batteries differ in capacity and battery voltage.

The capacity is measured in amperes multiplied by an hour (A * h). The higher this value, the more battery power is capable of carrying a charge, accordingly a larger amount of work will be performed on a fully charged battery.

The battery voltage is measured in V (Volts). From this indicator depends the power, which can be obtained from a screwdriver, working on these batteries. Simply put, battery voltage directly affects the maximum possible indicators of soft and severe torque, which we will discuss below.

Drill driver power

Two parameters, measured in Nm (Newtonometer), this is a soft and hard torque:

Soft torque is an indication of the maximum screwdriver effort in terms of twisting / unscrewing, the speed in this mode in most screwdrivers varies from 0 to 350 rpm.
The hard torque, in turn, reflects the maximum force in the drilling mode, in this case the rotation speed, as a rule, is calculated from 0 to 1000 and more revolutions per minute.
The more these parameters, the more powerful, more productive and practical the screwdriver. For example, a screwdriver with a torque of 25 to 30 Nm can easily screw a 70-mm screw into the wood. To tighten the screws from 70 to 100 mm, a torque of 40 Nm is required. To tighten longer self-tapping screws, a pre-drilling of the hole is required.

Additional

  • The presence of the impact mechanism, without a doubt, is a very useful function, especially when working with end heads or when drilling holes in bricks and stones.
  • The presence of a pulse, periodically increased torque, is useful for easier drowning of fasteners in the material, when unscrewing a stuck self-tap or even a drill if the puncher can not cope. Particularly useful when there is no possibility to rest against tightening the drill driver.
  • The presence of 3 speeds, will fully replace the network drill at home, as the speed of the cartridge in this mode can be more than 3000 rpm, and the first speed will give a decent torque.
  • Presence of illumination, it is very actual when working in hard-to-reach places or with bad, if not completely absent, lighting. The most successful version of the location of the backlight over the battery pack, there are models with a light located above the start button, which is less effective in most cases.

Conclusion

Summarizing all the above, I would like to point out that it is not possible to advise a universal screwdriver for everyone, because many components of the choice depend on your goals and objectives, which you intend to implement with this tool, but at last, I will still share my opinion on the choice, On some examples:

– Screwdriver for home: for the most part, there will be enough version without battery, due to availability, low weight and lack of need for special mobility. If you consider battery versions, then it’s worth paying attention to Ni-Cd and Ni-Mh, if they do not work often, you will save money and get a longer battery life.

In cases where frequent use is planned, requiring a continuous workflow, no doubt, the choice of Li-Ion battery will justify itself by 100%. Why do not I recommend taking more modern batteries for rare jobs? Everything is very simple, they are more expensive and designed for stable use, you should not forget that their shelf life is 2 years less, and therefore, there will be much more lost opportunities in this case.

For household needs, the maximum torque of 25-35 Nm will be enough, of course you can take more powerful, it’s all depends on your desire and financial capabilities. The capacity of the battery is not so important for periodic use at home, because 1.5-2 Ah will be just right.

– Drill driver for professional use: when working in hard-to-reach places it is logical to choose a more compact model. The features of frequent and long continuous use in many cases will justifiably lead to the purchase of a Li-Ion drill driver with a maximum torque of 40 Nm and above, depending on the type of materials to be worked on in the future.

Li-Ion batteries, in this case, are relevant due to the continuity of the workflow provided by the rapid charging of batteries, as well as they are simply lighter, which is important for your hand for long-term use.

The choice of additional options for a screwdriver depends on your needs. Try to clearly define for what needs you will use it, determine the budget. Not in the last place and the availability of other instruments such as a drill or perforator, with rare use, these moments will allow you to weed out unnecessary functions and highlight the ones that are obviously necessary.

In conclusion, I would like to note that the market of screwdrivers is saturated with various variations and choosing exactly what is right for you will not be difficult. We hope that we were able to help you determine the choice of screwdriver. We wish you the best results from the instrument and more positive emotions!

Pros and cons different types of drill drivers

Electric screwdriver – a universal electric tool for screwing/unscrewing bolts, screws, and also for drilling holes in hard surfaces.

Types of electric drill drivers

Household or professional

Household
Are intended for twisting bolts, screws and self-tapping screws. With their help, you can, for example, change the lock, hang a picture, collect furniture.

  • Torque 10-15 N ∙ m.
  • The speed of rotation is not more than 400-500 rpm.
  • Not suitable for frequent use.

Professional
In addition to twisting has the function of drilling hard surfaces.

  • Torque up to 130 N ∙ m.
  • Rotational speed up to 1200-1300 rpm.
  • Suitable for frequent use.

Electric network or battery

Bosh cordless drill driver

Bosh cordless drill driver

Before buying, you need to determine which screwdriver you need: electric network or battery. Both options have their advantages and disadvantages.

Without battery

Benefits

  • Power
  • No need to charge the battery
  • Unlimited work time

Disadvantages

  • Depends on mains power supply

Cordless

Benefits

  • No dependence on power network

disadvantages

  • Battery life is limited by battery charge

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