How to choose a screwdriver, 9-step instructions, an article from which you will learn everything about screwdrivers! Types, powers, characteristics, applications, comparisons.
We are preparing the orchestra for the working season. How to choose a screwdriver - 9-step instructions
To assemble furniture or hang a picture, today you don’t have to put in a lot of effort.
- The main thing is to choose the right tool!
This article will help you understand the variety of these tools and buy a screwdriver that is right for you.
1. Purpose of the tool
A screwdriver is only suitable for working with fasteners - an ideal assistant in assembling furniture or simple repair work.
There are also universal tool: a drill-driver that combines the first two functions - drilling and screwing.
Cordless screwdriver – performs the function of a screwdriver, and also allows you to unscrew and tighten fasteners. However, its power is lower than that of a conventional screwdriver.
2. Tool type
A classic of the genre is a hammerless drill or screwdriver. Such a tool makes only rotational movements. A hammerless drill is ideal for working with soft materials and wood.
- If you need to tighten screws or drill holes in the wall, this is a win-win option.
There are instruments with impact - in addition to rotational movements, they perform forward movements"back and forth". This allows you to drill more durable materials: concrete, brick and various metals.
*Impact drills are more versatile - you can always turn off the impact function and switch to working with more fragile materials.
Angle tools are necessary for working in confined spaces or hard to reach places. Here the gearbox is shaped like the letter “L” and is fixed at an angle of 90 degrees – hence the name.
Some hammerless screwdrivers also have additional angle bits. For example, this is very convenient when working under the hood of a car.
3. Chuck type
Any screwdrivers are equipped with a chuck. This is the mechanism that holds the bit or drill bit. In screwdrivers, the cartridge is installed under the bits. The bit is a small nozzle, hexagonal on one side and various shapes with another. To change the attachment, just remove one and insert the other until it clicks lightly.
Another important parameter– cartridge diameter. It determines what size drill or bit can be used when working with the tool. For non-professional instruments, a sufficient range is from 0 to 20 mm.
4. Tool power
The power of the tool is determined by the voltage supplied by the battery. It varies from 1.2 to 36 volts.
Thus, for small jobs you can buy a screwdriver with a voltage of 3-6 volts. For drilling non-solid materials, a screwdriver with a voltage of 10-15 volts is suitable.
- When choosing a screwdriver, pay attention to the battery capacity - the operating time depends on it. Average from 1 to 3 A/h.
Often included is a second battery for continuous operation, as well as a special charging base.
5. Maximum torque
Maximum torque – determines the effectiveness of the tool.
From this indicator one can understand how large diameter and the length of the screw can be tightened by a screwdriver.
- Power, voltage and maximum torque are interrelated indicators. The higher the voltage, the higher the torque.
A screwdriver's maximum torque can be several N/m. This is quite enough to assemble a chair or bracket.
A screwdriver with a torque of 10-30 N/m - to cope with any task. Tighten the screw tightly in the metal shelving - no problem!
*A torque of 30-40 N/M will easily allow you to drill through wood.
A device with a maximum torque of 40 N/m and more - can easily cope with brick, concrete and metal surface
6. Number of speeds
As a rule, screwdrivers and screwdrivers have only one operating speed: from 0 to 800 rpm - this is enough to work with fasteners.
But most drills and screwdrivers have 2 speeds:
1st mode with speed from 0-400 rpm - mainly used for tightening.
2nd mode with speed from 400-1300 rpm - for drilling holes.
- Almost all screwdrivers are equipped with a “reverse” function for unscrewing fasteners.
7. Additional information
When working with such tools, reliability and safety are important.
Many models have: locking the power button; battery protection system from overload, overheating and deep discharge; backlight working area built-in LED flashlight.
When choosing a tool, pay attention to its weight - the higher the power of the screwdriver, the heavier it is.
8. Equipment
Screwdrivers usually come with: a compact plastic or metal case, Charger for a battery, but sets of drills and attachments are purchased separately, most often.
- Do not forget that when working with screwdrivers and drills, you must protect your eyes - use construction safety glasses.
9. Recipes
If you need a tool for simple work, a small and lightweight screwdriver with a voltage of 3 to 15 volts, with a built-in battery, with a quick-release chuck or a padded one will suit you.
For some types of work, it makes sense to buy an angle-type screwdriver - especially if you often repair your car.
If you use tools at home and occasionally: it’s worth buying a screwdriver-drill - hammerless or impact, with a voltage of 15 volts and a torque of 30 N/m, or better yet, with power support from the mains.
Are there major renovations ahead?
An impact drill with a voltage of 20 volts, with a quick-release or screw-in chuck for large drills, with a torque of 40 N/m and 2 speeds for different operating modes is ideal.
Each instrument has its own special sound! Do you have a whole orchestra?
How to choose a screwdriver - video
Very often on forums people wonder what power they should choose a screwdriver in order to easily drive self-tapping screws or screws of such and such a diameter and length? Or, in other words, what torque should a screwdriver have in Nm for certain tasks?
People get different answers to these questions. Most often, there are offers from “all-knowing specialists” to buy expensive semi-professional 18-volt models. Like, they can definitely do anything. But is it worth paying twice as much if it suddenly turns out that younger 10-14 volt models are also good? And if there is a difference, what is it?
We will try to briefly talk about the theory and move on to practice.
Theory
Looking at the table, you might think that any of the commercially available screwdrivers will be suitable for 5x90 self-tapping screws. But this is not entirely true, as discussed in the practical part of the material.
Let's summarize the theory:
- we do not know from what “ceiling” the figures for the torque characteristics of screwdrivers specified by the manufacturer are taken;
- Captain Obvious also suggests that the material used has a noticeable impact on the entire process, as well as the parameters of the screws.
Practice
For practical exercises, we took three different screwdrivers and two different types screws/screws and we will screw them into dry pine beams, simultaneously recording the success of the operation and the time spent.
Here are the names of screwdriver models and their short names specifications:
It’s no coincidence that two “old guys” (Bosch and DeFort) ended up here. These low-power models will immediately make it clear how correct the entire theory stated above was, and whether absolutely any screwdriver is enough to successfully work with 5x90 mm self-tapping screws and the like. And the average Hitachi will simply complement our picture and play the role of some kind of modern instrument.
Regarding the screws, we did not waste time and took a thin black 4.8 x 127 mm and, for completeness, a powerful white 6 x 150 mm for testing. To screw the latter into a pine beam, presumably, a maximum torque of about 11 Nm is required.
So, as a summary, we invite you to watch a short video in which we captured the entire process.
A thin self-tapping screw (4.8 x 127 mm) turned out to be a feasible task for all screwdrivers, without exception, although it was clear that it was not so easy for Bosch. The time taken by the screwdrivers was: 5.3 seconds for DeFort, 7 seconds for Bosch and 2.9 seconds for Hitachi. We did not set the task of accurately comparing time and repeatability; only the final result was important to us. That's why we made only one take for each of the models.
The white “strong guy” was no longer too tough for everyone. As in the previous case, DeFort started very vigorously, but the last centimeter did not submit to him.
Bosch, although it solved the problem, the smell of burnt windings made it clear that such loads are strictly contraindicated for this tool.
Well, for the powerful Hitachi, both self-tapping screws are like toys. Here's what the stopwatch showed: 13.3 seconds for DeFort (missed 1 cm), 20.7 seconds for Bosch and 4.3 seconds for Hitachi. In addition, we note that during the test Hitachi worked at the second speed, where the torque was at least a third lower than the maximum stated in the characteristics.
We have one more important note regarding the practical part: our test involved screwdrivers of older models (Hitachi does not count), which do not have an overload protection system. Most modern models have such a system, so they will not allow you to abuse the tool as much as can be seen in the video with a Bosch screwdriver. This also means that the security system will not allow such a screw to be screwed in completely the first time. You will have to turn on the tool several more times until the protection is triggered again (usually 1-2 seconds) until the screw is tightened. But in order not to abuse the tool like this, of course, you need to buy a screwdriver with a certain power reserve!
conclusions
Concerning optimal power(torque) for working with screws 6 x 150 mm, then, in our opinion, it is in the region of 20-30 Nm. It can also be said unequivocally that home handyman, who has never seen 6 x 150 screws, there is no point in spending money on “monsters” with a torque of 40 Nm or more. Well, maybe only you will be attracted to them O greater battery capacity in watt-hours (due to higher voltage and more “cans”) or some other features.
In some jobs you have to tighten a lot of screws. You can, of course, do this manually with a screwdriver, but this requires considerable effort and takes a lot of time. To speed up the process, you need to choose a screwdriver. There are absolutely inexpensive models- household ones - which, nevertheless, greatly facilitate the installation and dismantling of screws. And some can also work in drill mode.
Household or professional
As you know, professional screwdrivers are more expensive, but this is no coincidence. They are made with a large margin of safety, for which higher quality and expensive materials. In addition, they have more power, which makes it possible to screw in longer screws and/or work with more rigid materials.
To solve household or professional screwdriver you need, estimate the amount of work that will need to be done. If you are starting construction or major renovation You probably need a professional or semi-professional model. If you need a tool periodically to unscrew/tighten something from time to time, a household tool is more than enough. With such work, the professional tool resource simply will not be in demand. So choosing a screwdriver based on this criterion is not very difficult.
Battery or mains
Having decided on the class, you will need to decide whether you need a corded screwdriver or a cordless one. The disadvantages and advantages of both are obvious: the battery-powered one has higher mobility and the cord does not interfere with operation, but it weighs more. The network connection does not depend on the presence of battery charge, but not all construction sites have power supply. IN overall choice difficult. The decisive point may be that a cordless screwdriver with a good battery costs significantly more than a similar model operating from the mains. The difference is due to the presence of a battery - good options are not cheap.
If you decide to choose corded screwdriver, pay attention to the cable length. The longer it is, the more convenient it will be to work - you won’t have to carry a carrier either.
To choose the right cordless screwdriver, you need to pay attention to the type of battery. The duration of operation on one charge, as well as the order of storage, depend on this.
- Lithium-ion (Li-lon). Holds a charge for a long time, charges quickly, has big number recharging, are almost not discharged during storage. All in all, a good option, but expensive. That’s why it’s probably more common on professional models, where the duration of operation on one charge is important. Disadvantages include fear of cold, which is important in our country.
- Nickel metal hydride (Ni-MH). This type batteries environmentally friendly, small in size and weight, average price. Disadvantages - they don’t like it either low temperatures, have a short service life - about 3 years. But it’s easier to work with such a tool—the hand doesn’t get so tired. When storing the battery, the battery is fully charged; discharged batteries cannot be stored. During storage they are discharged, but moderately.
- Nickel-cadmium (Ni-CD). Main advantages - low price and a service life of 5 years (number of charges - about 3000), is not afraid of frost, that is, you can work outside in winter. Disadvantages - it takes a long time to charge (it takes twice as long as charging other types of batteries), has a “charge memory”. Charge memory is a nasty thing. If you charge a battery that is not completely discharged, the total capacity of the battery will decrease. It will become smaller by exactly the value from which the charge began. Therefore, you need to work with such a tool until the battery is completely discharged, which is not always convenient: it cannot always “tighten” the screw, you have to help with your hands or tighten it with a “fresh” battery. Store completely discharged, otherwise the capacity will decrease again.
The cheapest type of battery is nickel-cadmium, but they have a “charge memory”
So, if you choose a cordless screwdriver for periodic work, a nickel-cadmium battery will do just fine. If you use it carefully, it will last a long time. If you are starting large-scale work, it is better to use other batteries - there will be less downtime, the work will move faster.
Chuck type
There are two types of screwdriver chuck: key and quick-release. The quick-release (usually has three blades) allows you to change attachments in a matter of seconds - the cartridge is turned a little by hand, the nozzle is changed, after which it is again turned a little in the opposite direction. In addition, there is another positive point: in such a holder it is fashionable to install a nozzle of any thickness. The main thing is that the shank fits into the holder.
The same operation with a key cartridge requires a special key. It is inserted into a special socket and turned until the nozzle is released. After replacement, the key turns in the opposite direction. The disadvantage is obvious: you need to have this key on hand.
By structure quick-release chucks may have one or two couplings. If there are two couplings, one of them fixes the cartridge, the second – the shaft. If there is only one clutch, then there is a shaft lock button on the body.
Choosing a screwdriver based on this parameter is not difficult - usually everyone agrees on quick-clamping ones. They allow you to fix larger nozzles, although all other things being equal they are a little more expensive.
Technical specifications
Once you have decided on the type of screwdriver and power supply, you need to focus on the technical specifications. They determine what screws and what material you can screw into.
Rotation speed and torque
The force with which a screwdriver can turn a screw is determined by the torque. It can be very small for household models - 10-15 Nm, or can reach 130-140 Nm for professional ones. Therefore, professional screwdrivers can easily and quickly tighten large screws and work with hard materials.
But high torque is not always necessary and not with all materials; therefore, screwdrivers provide the ability to adjust the applied force. There is a limiter for this. It is made in the form of a movable ring, which is located behind the clamping chuck.
There is a mark on the ring, aligning it opposite a certain number, you set the maximum force that the tool can develop. Once this value is reached, the cartridge will spin idle - the screw will no longer be tightened. The achievement of this value can be clearly monitored - the ratchet turns on.
Many models of screwdrivers can operate in two modes: actually tightening the fasteners and drilling. Such models are called drill-screwdrivers, but they are now the majority. To switch to the drill mode, the switch is set to the extreme position (having first replaced the nozzle). At the same time, maximum speed is turned on, which allows you to drill even quite hard materials.
Screwdriver power
Both torque and rotation speed are a consequence of the power of the electric motor. Therefore, we must also look at this parameter. But here it is necessary to monitor three quantities at once: so that the power of the screwdriver corresponds to the speed parameters. Powerful models with good parameters can be found from many manufacturers, but such as Metabo (Metabo), Bosch (Bosch) and Makita (Makita) and other well-known prices for them are very high. There are other brands with similar characteristics, but at more reasonable prices. For example, RYOBI (Riobi). The brand is still little-known, but according to reviews it is no worse than the above-mentioned ones famous brands. In order to be able to compare the main characteristics and price of models of approximately the same power, but different brands, let's put them in a table.
| Model | Tool type | Chuck type/diameter | Maximum idle speed | Maximum torque | Number of speeds | Maximum drilling diameter wood/metal | Battery type, charging time | Battery capacity/voltage | Possibilities | Adaptations | Weight | Equipment | Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bosch GSR 1800-LI 1.5Ah x2 Case | hammerless drill/driver | quick-release 0.8-10 mm | 1300 rpm | 34 Nm | 2 | 29 mm / 10 mm | Li-ion | 1.5 Ah / 18 V | power button lock | 1.4 kg | 6.7 t.r. - 7.5 t.r. | ||
| Bosch GSR 18-2-LI Plus 2.0Ah x2 Case | hammerless drill/driver | quick-release 1.5-13 mm | 1900 rpm | 63 Nm | 2 | 38 mm / 13 mm | Li-ion | 2 Ah / 18 V | reverse, spindle lock, electronic overload protection, electronic adjustment rotation speed | 1.49 kg | case, two batteries, charger | 11 t.r. - 13.5 t.r. | |
| Makita 6347DWDE | hammerless drill/driver | quick-release / 1.5 - 13 mm | 1300 rpm | 80 Nm | 2 | 38 mm / 13 mm | Ni-Cd | 2.3 Ah / 18 V | 1.5 kg | 13 t.r. | |||
| Makita 6347DWAE | hammerless drill/driver | quick-release / 1.5 - 13 mm | 1300 rpm | 80 Nm | 2 | 38 mm / 13 mm | Ni-Cd | 2 a.h. / 18 V | reverse, electronic reverse, electronic speed control | bit socket, power button lock | 1.5 kg | two batteries, charger, bit, case | 11.3 tr. - 12 t.r. |
| Hitachi DS18DVF3 | hammerless drill/driver | quick-release / 13 mm | 1200 rpm | 45 Nm | 2 | 21 mm / 12 mm | Ni-Cd | 1.4 Ah / 18 V | reverse, electronic speed control | bit socket, additional handle | 2 kg | case, flashlight, set of attachments | 7.6 tr. - 9.5 t.r. |
| Hitachi DS18DSFL | hammerless drill/driver | quick-release 2mm / 13mm | 1250 rpm | 41 Nm | 2 | 38 mm / 13 mm | Li-ion | 1.5 Ah / 18 V | reverse, electronic speed control | power button lock | 1.7 kg | 8.7 tr. - 11.6 t.r. | |
| Metabo BS 18 10mm 1.3Ah x2 Case | hammerless drill/driver | quick-release / 1-10 mm | 1600 rpm | 48 Nm | 2 | 20 mm / 10 mm | Li-ion | 1.3 Ah / 18 V | reverse, spindle lock, electronic speed control | bit socket, spotlight, power button lock | 1.3 kg | two batteries, charger, case | 7.7 t.r. - 8.1 tr. |
| Metabo BS 18 Li 2012 13mm 2.0Ah x2 Case | hammerless drill/driver | quick-release / 1.5-13 mm | 1600 rpm | 48 Nm | 2 | 20 mm / 10 mm | Li-ion | 2 Ah / 18 V | reverse, spindle lock, electronic speed control | bit socket, spotlight, power button lock | 1.5 kg | two batteries, charger, case | 10.3 tr. - 10.9 tr. |
| RYOBI RCD18021L | hammerless drill/driver | quick-release / 1.5-13 mm | 1600 rpm | 45 Nm | 2 | 38mm / 13mm | Li-Ion | 1.4 Ah / 18 V | reverse, spindle lock, electronic speed control | bit socket, magnetic holder on the body, spotlight, power button lock | 1.2 kg | one battery, charger, bit, bag | 7.1 t.r. - 7.8t.r. |
| RYOBI R18DDP-0 | hammerless drill/driver | quick-release / 13 mm | 1600 rpm | 45 Nm | 2 | 32 mm / 13 mm | 18 V | reverse, electronic reverse, spindle lock, electronic speed control | socket for mounting bits, magnetic holder on the case, locking the power button | 1.81 kg | bit (without battery and charger) | 2.7 t.r. - 2.9 tr. |
It’s worth saying a few more words about the number of operating speeds. Do not confuse with the number of rotation speeds. These are two operating modes that are used when working with different sizes screws or drills. When working with small screws/drills, you can select a higher speed, when screwing in large screws or drilling large holes- smaller.
Battery options
To choose the right screwdriver with batteries, in addition to the type of batteries, you need to select their operating parameters:
To choose a screwdriver for home or professional use and not regret it, you must review these parameters. If you have selected several models, compare them according to these characteristics, because it depends on them how long the interval between charges of the screwdriver batteries will be.
Additional functions
As usual, these functions are not mandatory, but they significantly increase ease of use. Some, if they raise the price, do not raise it significantly, while others raise it quite significantly. To choose the most inexpensive screwdriver, you can get by with the minimum - reverse and the presence of illumination of the work area. The rest, of course, are useful, but are more suitable for professionals.
Reverse or reverse
The presence of this option allows you to unscrew a screw or drill stuck in the material. The direction of rotation changes when the polarity of the power supply changes, which is done through a special button. It is usually installed near the trigger lever.
Most often, the button for switching the direction of travel has three positions: on average, the tool is blocked. This increases safety: if you accidentally touch the lever, the screwdriver will simply stop, rather than immediately start rotating in the opposite direction.
Work area lighting
A very convenient option that does not greatly affect the price of the screwdriver is illumination of the work area. With good lighting it is much easier to control the instrument.
Illumination of the work area is a useful additional function of a screwdriver
An LED is built into the handle or body of the tool near the chuck, which lights up when the start button is pressed. If you want to choose a screwdriver that is convenient to work with, make sure that the work area is illuminated.
If you decide to choose a cordless screwdriver, it would be a good idea to have a battery charge indicator. These are LEDs different colors- green, yellow, red, which are located on the body. If the light is green, the charge is full; if it is red, the charge is almost empty.
The location of the indicator depends on the company, but is usually located on the thickening of the handle, in the same place as the backlight LED, or in the upper part of the case.
Automatic feeding of screws
Such screwdrivers are also called shop screwdrivers. This option is useful for professionals, especially those who work with drywall, where fasteners must be installed in small increments. Self-tapping screws are attached to a special tape, tucked into guides, and automatically fed into the holder.
This option can be implemented in two ways: there are store-bought screwdrivers (pictured on the left) and there are attachments for a regular screwdriver. For home use the second option is preferable, since the tool can work as a drill or in reverse. A shop screwdriver is highly specialized equipment for professional use.
Repair is a permanent condition, and a screwdriver will be a good and necessary assistant. There are also almost everyday tasks in which the help of modern technology is useful. For example, how often do you tighten or remove screws? I think quite often. Buy a screwdriver, you will do it even more often, but faster, easier and with better quality.
And if you want to attach decorations and paintings to the wall yourself or its elements (shelves, whatnots), it will not be easy without a screwdriver. Try, for example, without precise (down to the millimeter) drawings to assemble and fit the parts of a multi-level bookcase, folding sofa, while alternately tightening and unscrewing the screws, transferring them to a new place. Of course, as they say, measure seven times... But help convenient tool It won't hurt you anyway. And there will be no damaged screws or additional calluses.
In other words, screwdrivers are designed for tightening screws and self-tapping screws without preliminary preparation holes. They allow you to save energy, quickly and easily perform labor-intensive tasks. handmade, improve its quality. - This is one of the three important tasks of a man. And, having built it, equip it with beautiful and comfortable furniture, decorate with paintings and fence with an attractive picket fence. A screwdriver will be your reliable assistant in everything.
Design and principle of operation of a screwdriver
The principle of operation of a screwdriver is the same as that of a drill, but there is a difference - a torque limiter. Directly behind the chuck, the screwdriver has an adjustment ring that allows you to set the required torque: as soon as the screw is tightened, the chuck stops. although the engine continues to run. This prevents the slot on the screw from breaking off, “sinking” into the depth of the surface and wear on the screwdriver bit. The number of adjustment steps usually ranges from 5-7 to 22, and if the screwdriver can work as a drill, then there is also a special provision - “without limitation”, i.e. all the torque is transmitted to the drill. It is the stopper that determines how accurately you screw the screw and whether its head will remain on the surface.
This tool will help you secure many small but necessary interior details; it simply never tires.
What about the drill?
What kind of screwdriver do you need for your home?
Like all tools, screwdrivers can be professional or amateur. As has already been written many times, professional ones are designed for long-term, without interruptions, permanent job and have a greater resource, are made from more expensive materials and, naturally, they cost more. A amateur instruments involve a smaller scope of work, a smaller resource and a lower price.
Family contract - modern screwdrivers will be obedient and useful even in graceful female hands
Often people are on the hunt for a tool with a serviceable motor to extend its life. But a good amateur screwdriver, even with a maintenance-free motor, has a service life of at least 150 hours of pure operation, and there are tools that have a service life of 1,500 hours. How much it will be in thousands of tightened screws is not difficult to calculate. There are corded screwdrivers, these are professional and very powerful tools. But cordless screwdrivers are more often found on sale, and these are the tools that are offered for home users.
Furniture assembly is the main use of screwdrivers. No matter how many screws there are, you will tighten them quickly and efficiently
What's good about a cordless screwdriver?
It is safer and more mobile (the wire does not get in the way, and you can easily work, for example, on a ladder). A cordless screwdriver is indispensable in the country and just on the street. , more ergonomic, lighter, which means that when working with it, you will get much less tired.
Which screwdriver battery is better?
Theoretically, a nickel metal hydride (Ni-MH) battery is better. For environmental reasons, the whole of Europe is switching to such batteries, since nickel-cadmium batteries(Ni-Cd) contain cadmium, which is considered an allergen. But our choice is still limited, and Ni-Cd batteries are the most common. By the way, they have their pros and cons. Ni-MH batteries have smaller dimensions, but are less able to withstand high currents, and it is better not to use a tool with a Ni-Cd battery in conditions negative temperatures. Finally, Ni-MH batteries have a higher capacity, but also a higher price.
An important point is the battery capacity. The larger it is, the longer it will not need to be charged. Many models often have two batteries: you use one and charge the other. With this configuration, the difference of 0.5 Ah may not be noticed.
And the main disadvantage of household models compared to professional ones is that charging usually takes 1-2 hours, and few models can boast of a half-hour charge.
Due to their size, very small household models are very convenient when working in corners and other hard-to-reach places
Screwdriver torque and speed
We have already talked about the limiter, but now we will clarify what numerical parameters you should look at when choosing a screwdriver. For screwdrivers, the torque is most often limited at 5-10 Nm. This is enough to tighten the most “serious” screws, and the engine does not suffer from overloads. Impressive numbers in front of the letters Nm (there are models up to 30 Nm) are useful when screwing screws into hard materials, such as steel, hard wood - beech, hornbeam, oak, and also when using a screwdriver as a drill - for drilling large-diameter holes. But do not forget that the maximum drilling diameter of screwdrivers is still limited, therefore the drilling function is only auxiliary.
In general, screwdrivers with high torque can be called universal: they are equally convenient for tightening screws and drilling any materials. Less “strong” screwdrivers are best used only for assembly work.
Much more important is how the engine performs under load, whether it holds speed well and whether it produces enough power when the battery is discharged. True, this can only be determined experimentally. Another serious indicator is maximum speed. To tighten screws, 500 rpm is enough, but for drilling you need 1200-1300 rpm. An even higher rotation speed is needed only for specific tasks.
By the way, modern models supplied powerful system cooling with increased air flow, which protects the tool from overheating at low speeds.
Powerful models of screwdrivers can handle a large volume of work, for example, installing the roof of a house or ceiling parts
Choosing a screwdriver and proper care of it
When choosing models, it is necessary to compare their main technical characteristics: rated power, speed idle move, maximum diameter of screws, maximum drilling diameter in steel and wood, torque, weight - assessing all this from the standpoint of practical necessity. And of course, the decision to choose a specific screwdriver model should be influenced by the quality of the tools, the level of service and maintenance time, the price/performance ratio of power tools and spare parts.
The construction market now has enough wide choose drills and screwdrivers from various manufacturers. The differences between models from different companies are manifested mainly in the ease and convenience of working with them, the availability additional functions and configurations.
And in conclusion, it is worth adding the following: like any power tool, screwdrivers require careful attitude, the right conditions storage and operation (dry place, no direct contact with sun rays, temperature range from 10 to 25°C). Leaving a screwdriver idle for a long time, especially when discharged, is harmful to its battery, so periodically give it at least some work. Alternatively, disconnect the battery during storage. And batteries with a “memory effect” will have to be “dried” before use, that is, the charging/discharging cycle will have to be repeated several times.
When purchasing a screwdriver or hammer drill, you need to pay attention to many criteria. You can buy a regular one household tool, which is suitable for minor repairs, but it is possible to choose a professional or universal one, which has more power. When choosing, you need to pay attention to what maximum torque a screwdriver or hammer drill is provided for, otherwise the tool can be broken in the first hour of fruitful work.
Screwdriver speed
The maximum torque of a screwdriver is a value that indicates the load level. For professional and household devices it is different. But most often it is 5-10 Nm (Newton per m), which is quite enough for high-quality, safe work screwdriver. This is enough to ensure work even with very tight screws when drilling such surfaces as concrete or steel, when creating holes with large diameters.
What should be the maximum torque of a screwdriver? If you need a universal screwdriver, then the torque must be selected quite high so that with the help of the device you can not only screw in self-tapping screws, but also drill holes with a different diameter from each other.