How to choose a screwdriver - technical specifications and selection criteria
Every man who is at home or master, there is usually a screwdriver.Well, or plan to acquire it.Indeed, without this tool can not do nothing to repair, either during construction or during minor housework.Assemble furniture, hang ledge or shelf, unscrew the old screws - in all these cases the device rescue.Today we tell about how to choose a screwdriver that best suits your ideas.At the same time determine where the "golden mean" in a combination of price and quality.
- Where are screwdrivers and how they work
- How to avoid mistakes when selecting a screwdriver
- for "pro" or a household screwdriver.About
- torque and speed
- Battery or running from the network?
- Choosing a battery with a mind
- Species cartridges
- Availability reverse
- Convenience and design
- Video: Choosing drills
Where are screwdrivers and how they work
This tool is widely used and the owners of the cottagesand those wh
Consider the elements that make up the screwdriver:
- motor rotating at a certain speed.
- planetary gearbox transfers the force to the spindle, which is equipped with clamps the cartridge.
- attached to the gear coupling, which regulates torque.
- To attach the nozzle to the motor shaft, called bits, has clamped chuck.
- electronic control system is equipped with a button to start the device and switch flyback.
- as the power supply is commonly used battery.Therefore, this type of equipment is convenient to use where there is no electrical outlets, as well as in places where cable does not make it.
And now the list, for which it is advisable to use a screwdriver works:
- screwing and unscrewing a variety of fasteners.This screws and bolts, screws, and, of course, screws.
- When installing this unit, you can tighten Fixing Technology.
- wood, both soft and hard, well drilled screwdriver.
- They can drill and a metal surface.
- this device it is possible to tap a metal (not only) the details.
How to avoid mistakes when selecting a screwdriver
Keep in mind that by coming to the store, do not pay attention only to the cost of the device.When deciding which to choose screwdriver, carefully read the passports vending models.They are bound to be given the most important technical characteristics of the device.These are: the speed of rotation, the type of battery (if it exists) and torque.According to these parameters, and it is necessary to choose their own tools.
for "pro" or a household screwdriver.
Think of repair and construction you plan to implement.Based on this, and make your choice.If you are not so keen masters, and you will only get the device out of the case just a couple of times a month, it makes no sense to take a professional screwdriver.Right, do not game worth the candle - the amateur model, battery powered, it is enough for you.All the necessary functions she has, and it weighs much less than professional.
If almost every day you need something to collect, or to build a tie, then look in the direction of not very cheap, but very powerful professional models.They usually operate on the network have impressive dimensions and weight.There is a sense such network screwdrivers select those who have a lot of work ahead of heavy loads.
about torque and speed
Torque determines how much power screwdriver is working to wrap the screw or the force with which it resists load.In the home devices are used, the torque of which is between 10 and 15 Newton meters.Professional models can have a torque up to 130 Newton meters, causing them an opportunity to drill very hard materials.Shaft of such instruments does in one minute 1200-1300 rpm.Domestic models are content with 400-500 rpm.
Depending on the length of the selected torque is screwed screws, as well as its diameter.More powerful screwdrivers can be spun thicker and long screws.Also, these devices can be used when working with a fairly solid materials without fear of breakage.
from other power tools screwdriver is different in that its torque can be adjusted.It uses simple enough device - limiter.It is a ring located immediately after the chuck.With it you can set some effort after which the screw is not screwed over.Screw the screw - holder immediately stopped, though the engine still turns.This clearly hear the sound of rattles.This limiter protects tools from many misfortunes: wear bits of failure at the slot screw and it too deep embedding into the surface.
limiter maximum torque.
from Ratchet clutch protects the motor against overload, allowing the torque shaft is free to slide.Fixed maximum torque, by the way, is quite sufficient to screw and unscrew very tight, and do not overload the engine.To switch to the drilling, it is necessary to translate the sleeve to the opposite end position.This torque limitation will be removed t. E. Screwdriver will work like a normal drill.
screwdrivers Usually, there are two modes - one allows you to drill, the other - to turn the screws.
screwdriver to choose the right note and some of the nuances.It is necessary to check whether stable operating motor under load is stored if the frequency of its rotation.Another important quality of the power supply, its ability to hold a charge, and the capacity of the device when a dead battery.
Battery or running from the network?
There are two types of screwdrivers: running from the power cord and have their own battery.With regard to the first, they have a considerable weight, and working with them can only be far away from electrical outlets.However, you can buy an extension cord and from the footage and it will depend on the range of tools.Cordless devices easier, and have a significant advantage - autonomy.
build is not always necessary to close sockets, so the field model with its own battery, of course, is more convenient.Agree a little fun - wearing a wire for a meter, which, unfortunately, still confused all the time.And when working at height and does not get to use network models.After all, they are also heavy - lift up their problematic.Therefore, a closer look at a model with a rechargeable battery.It is important to choose the right type.
most widely used cordless screwdriver.
Network, a professional model.
Choose wisely battery
To work comfortably, but not to run every half hour to recharge the instrument, watch its battery.In fact, how to choose a cordless screwdriver, a special difficulty is not - simply take the device more powerful.And excellent service will serve a spare battery, if available in the kit.Regarding charging time, then a professional tool it is about an hour, and at amateur - up to 7 hours.This depends on the device for charging.
screwdrivers batteries used in three varieties:
- nickel cadmium,
- Lithium ionnnye,
- nickel-metal hydride.
1. becoming increasingly popular the past, and today many of the new European models are equipped with screwdrivers is environmentally friendly battery type Ni-MH.Small and lightweight, with no memory effect, these batteries have only two drawbacks.They do not like cold weather, and overcurrent.Oh, and the price a little vysokovat.But the number of recharges with stable capacity they have - 1500 times.To store these batteries should be well charged, discharged and stored in the form is not acceptable.But they do not have such a large memory effect as nickel-cadmium, and are more powerful.
2. batteries based on nickel-cadmium more toxic elements, but the number of recharges them twice more than the previous type.Therefore, instruments sold today in shops and markets, for the most part has a battery type Ni-Cd.They are also cheap enough, and frost are not afraid at all.So for Russian conditions better suited nowhere.Here are these batteries suffer from a strong self-discharge, and even memory effect - a significant disadvantages.For storage do not forget to fully discharge.Otherwise, you run the risk of resulting in a battery with less capacity.
3. Li-ion batteries in screwdrivers are built not so often.They are more sensitive to cold than nickel metal hydride batteries, and their low capacity.The number of charge cycles - up to 3000, there is no memory effect.Large battery capacity slightly offset by prohibitive costs.Self-discharge, they are substantially independent.They are somewhat more suitable for use in the home but the price is not happy.
To choose a good screwdriver, take the time to choose his battery.After the battery is more than half the price of the instrument or, more precisely, from 60 to 70 percent.Read the passport instrument and compare the following parameters:
- battery voltage;
- capacity of the battery;
- the presence or absence memory effect;
- presence or absence of self-discharge;
Battery - is a removable element.It consists of multiple power sources in a common housing.They are bonded together by means of plates.The total voltage is summed at the output, making 24, 18, 14.4, 12 or 10 volts.It determines how long the device and the power.
capacity depends on which element is mounted inside the battery.It defines the total number of charge cycles and battery life.Over time, the capacity decreases.
memory effect of the charge - it is the ability to lose capacity if the battery has not been discharged, and then fully charged.E. Before charging it a must fully discharge.Lying around in the case, still charged battery will lose charge.Therefore, we must also be sure to fully discharge NiCad batteries if the instrument is to be sent to storage.
And another tip about the battery: refer not only to the output voltage, but also on the ratio of the current at the time of operation.This value is measured in amperes per hour.The greater its value, the longer the battery will hold a charge.Batteries with the same voltage may have different value amperes / hour.
There are cartridges for clamping parts of two types: quick and decisive.For the last clip needs special key-type gear.If you use quick-mechanism, it's much easier - you can drill and insert it without difficulty, and bit holder.
In turn, the chuck controllable switch may have either one or two coupling.When using the one clutch, the device further has a shaft locking mechanism when replacing one nozzle to another.If the two clutches, instead of locking the cartridge holding one of the couplings.The second cartridge clamps.
Reverse, commonly referred to as reverse, and will help to unscrew the screw tight, and hopelessly stuck drill pull out of the solid material.As a rule, it uses an electronic switching motor poles.For convenience, the switch to a reverse mode button near the trigger device.It has two positions, and at a position midway between them, the device is blocked.It is necessary not to accidentally press the wrong time.
reverse switching function.
Convenience and design
Wondering how to choose the screwdriver for the house, not limited to viewing pictures on the site.After you use the tool - that hold it in your hands, check for tight if he had buttons, well if they switch.The center of gravity must be located in the handle - so the hand while working less tired.Once the cartridge has to be sure to adjust the ring twisting forces.When the screw is screwed to the end, this device will not let him go too far.And inventory will not wear out quickly.
small and thin screwdriver handy when assembling furniture.
Classic model contains all the basic functions.
Screwdriver with automatic feed screws, is a processor, which is useful for professionals.
screwdriver with magnetic holder for screws.
backlight function at work.
What is the case
Options screwdriver may be different.It is better if it includes not only the device but also all the necessary nozzles.This will allow in the future to save money and time.After all screws, bolts and screws are released today, with many options of hats - so will need a variety of nozzles.
learning in this article all the possible options, write yourself the most optimal, that are right for your needs and go to the raid on the store carries a selection.
for this appliance can be the following parameters:
- Torque: 10 Newton meters.
- 400 - 500 rpm.
- 2 mode (twisting and drilling).
- Availability reverse function.
- type: Battery.
- Battery: nickel-cadmium or nickel-metal hydride.
- Voltage: 10 - 14.4 V.
- Value: ampere / hour more the better, if you have two batteries power the same, and this figure is higher, it is better to give preference to the device.
Video: Choosing drills
- Reviews of screwdrivers of different brands
not received an answer to your question?It was not clear moments?
Ask our experts and visitors:
+ Add new question