electric screwdriver batteries how many volts amperes. The effect of memorizing the charge level
Screwdriver how to choose
One of the widespread tools among masters is a screwdriver. In popularity, it is, perhaps, immediately behind the drill, although it includes some of its functions. The main purpose of this tool is to entrust the screws, or rather, to screw screws.
Let’s look at the basic requirements that you need to consider when choosing a screwdriver. They are divided into two main types, and these are network, operating from the household network 220 volts, and battery, operating respectively from the battery. Since network are not widely common, we will not specifically consider them, but only say that many choice parameters automatically become relevant for network screwdrivers.
How much volt should be a screwdriver? The voltage of the screwdriver battery directly affects its power. From the course of school physics, we know that the power is equal to the voltage of the current force. From this it follows that the higher the operating voltage of the battery, the higher the power of the device. From the screwdrivers presented on the market, batteries of batteries of 6, 12, 18, 24 and 36 volts are common. This voltage is always indicated by the manufacturer on the label of the product.
How much watts should be a screwdriver? This question was partially covered in the previous paragraph. But it is worth summing up, the more powerful the screwdriver is, the more comfortable it is to work with it. It should be borne in mind that the power of the device must correspond to the battery. The power of the battery should be designed for energy consumption by a motor, which is built into a screwdriver. With incorrect ratios, you can get a quick battery discharge. It should also be noted that the more powerful the device is and the power of power is more powerful, the higher the weight-gamyard characteristics of the tool. Well, as a result. A higher price of a screwdriver. If we consider the power of the battery, then most likely it is more correct to say not power, but the battery capacity. It is measured in an ampere of watches and is designated as ah.
Screwdriver with which battery to choose? Three types of non-served batteries are common in household appliances and tools: nickel-cadmium (Ni-CD). Nickel-metal-hydride (Ni-MH) and lithium-ion (Li-Ion). The first and latter have a huge flaw. Memory. Over time, these types of batteries begin to charge and not be discharged completely. This leads to the loss of the power of the element, but simply to say, to the loss of our precious ampere hours. In addition, the average number of the charger is 1000 cycles. With intensive use of the tool, batteries will quickly fail. There are various ways of resuscitation of such containers, but this is quite problematic, and they are not fully restored and not for a long time. Lithium batteries are deprived of the effect of memory, but they poorly tolerate extreme temperatures. But such batteries are more durable and much easier than their counterparts. Reliance for owning a lithium-ion battery will be a higher cost of a screwdriver.
What should be the moment in the screwdriver? An explanation is necessary here. This refers to the moment of tightening the screwdriver, or rather to say the torque. For motorists, the expression “torque” is probably familiar. In order not to load you with definitions, I simply say. The moment of tightening is the maximum constant load on the screwdriver, in which the device can continue to screw at constant speed. The higher the torque, the more long and thick screws you can “drive” into the walls and other obstacles. The moment is measured in Newtonians per meter and briefly designated as Nm. It is advisable not to buy screwdrivers with a moment below 10-12 nm.
Screwdriver with what speed of rotation to choose? Here you must determine for yourself. If you want to use the device only to spin screws, then this is one thing, and if there is a desire or need to post something inadvertently, then this device should have completely different characteristics. Speaking of characteristics, we will keep in mind the speed of rotation of the rotor. For standard screwdrivers, it is about 750 revolutions per minute. There are also two.Speed models that may be more expensive, but here you already get two speed ranges. For example 750 and 1200 revolutions. Is the second speed for a screwdriver important so important? It’s hard to say, because the work in both cases will be completed. With small volumes of wrapping screws, you will not feel this at all, but the screwdriver in the role of the drill already completely eared on the horizon. But here again, the speed of a full.Functional drill is an average of 2400 revolutions per minute. If your screwdriver is capable of this, then buzz. The opposite situation is when they want to get a screwdriver from a drill. This will not be quite equivalent to exchange, since the drill does not have a freeze. Friction is a device that is tuned in the operation with a certain value of the moment. If you tighten small screws, then the moment of operation set less. Otherwise, at a large moment, the screwdriver drove the self.Tapping screw so deeply that this can cause the marriage of the wall, boards and other details into which this screw was screwed up. The default drill has no friction.
Is it worth taking a screwdriver with the function of the penetrator? The pedulator is a drill function and it serves in order to drill stubborn surfaces such as concrete, brick, etc.P. If you want your screwdriver to work for a good drill, then feel free to purchase a model with such a “bell.”. Otherwise, this is an excessive function and you should not overpay for it. Be sure to read the article why concrete is not drilled? Burn and break down.
Shurovyrt, whose to choose? The more accurately posed question sounds like a screwdriver which manufacturer to choose. In this situation, the choice depends on you. We discussed all these factors of choice. You have to proceed from the parameters of convenience, price and personal sympathy. We will not list well.Known brands and tell you about their advantages and disadvantages. You work with the tool. Look. Is it convenient to lie in the hand, whether it will be difficult when performing long.Term work, etc.P. We are sure you will get what you need!
The 18650 battery for an electric screwdriver should be high
All Li-Ion batteries of 18650 are divided into two types: high-precision and low-flower. The high.Precision battery is able to issue more than 10 amperes without harm to the battery. Low.Cut batteries are simply not designed to work under load with a current of more than 10 amperes. They can give out such a current, but when working with such a load, the battery very quickly fails (the container decreases, internal resistance increases, excessive heating of the battery begins). Also, in low.Flower batteries when working with large load currents, the voltage is planted much more than in high.Precision models.
Thus, in electric screwdriver, only high.Precision batteries should be used. Over, the more current batteries will be designed, the better.
We measure the current strength
Many are interested in the question of how to measure the current strength of the charger. Examples can be different. A battery, a battery, and even an ordinary indoor outlet. Such a question is not entirely correct, and this is a reason. For a power source it is not possible to determine the current strength, since such an indicator is determined only in the electrocope. Therefore, you will have to create it, taking a power source, any device and multimeter. The approximate scheme will look like this:
Features and rules for charging the battery of screwdrivers
Batteries made from different materials. This affects the dimensions, weight, the ability to drill at minus temperatures, stress, capacity, susceptibility to memory effect. The latter especially affects the principle of charging an electric screwdriver.
Memory effect is a loss of capacity achieved by incomplete discharge of the battery. If you stop using the tool before it is completely discharged, the device will “remember” this and will not use the resource in full. Non.Compliance with the rules of operation of the battery reduces the capacity.
How to store the battery. Charged or discharged
Important! The recommendation is common for all battery. Store in a cool place, at an air temperature of 10. 15 about. Charge at 10. 20 °. Store a battery of different types should be at different charge levels.
Full Analysis of a Battery Capacity-Meter from Ebay
Stored in discharged state. The level of charge is close to 10–20 %. Due to the presence of a self.Discharge current and the effect of memory, taking into account that the deep category is not very harmful. In a discharged state, the self.Discharge current is minimal. After storage before work, finally discharge and then completely charge.
Storage in a completely charged state. 100 %. Afraid of a deep discharge, after which the lost capacity is not restored. The memory effect is much lower than that of cadmium. And the self-discharge current is 2 times higher, due to which there will be a decrease in the charge capacity to 20 % per month. For 6 months they lose 100 % charge. To reduce the risk of deep discharge, they need to be stored completely charged. Every 3 months, and it is better to discharge and charge more often.
Lithium (Li-ion) and polymer (Li-Pol)
Store half discharged, 40-50 % charge. The lower the storage temperature, the lower the current current.
Alteration of the electronic transformer
A good and rather compact power supply can be made from the so.Called electronic transformer (ET) designed to power low.Voltage halogen lamps.
But in order to use the transformer together with the screwdriver, it (block) must be finalized. Take a look at the classical scheme of the simplest ET.
This is the simplest impulse reducing power source assembled according to a two.Stroke scheme. The output voltage is removed from the secondary winding of the output transformer. The scheme given in the figure, of course, is not the only. There are easier devices, it is more difficult. There is a stabilization of the output voltage, a smooth starting system and protection against short circuit. But what interests us is an unchanged part of any electronic transformer. So, what’s the difficulty?
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The problem is that the output voltage of such BP variables with a frequency is dozens of Killerz, and even modulated by a frequency of 50 Hz. It is suitable for eating incandescent lamps, but not suitable for screwdriver. So, it needs to be straightened and smooth out. To do this, use the VD1 diode and two smoothing capacitors. C1 and C2, connecting them according to the scheme below.
The H1 lamp serves as a load when the screwdriver is disconnected. It is necessary to start the converter. Without load it simply will not start. The high.Voltage electrolytic capacitor can be taken from the PSU for a computer or any other device, say, from a TV with a pulsed power supply. It is located in the electronic transformer case. The diode and the capacitor are placed in the tool case, and the lamp is installed so that it also illuminates the workplace. It killed, as they say, two hares at once. Such a lamp will be much more convenient than standard backlight, which turns on only with the tool. You are blindly aiming in the dark, then you start a screwdriver and look where you get.
Diode KD2960 is a fast.Acting rectifier diode designed for current 20 A and withstanding reverse voltage 1200 V. Its foreign analogue. 20ets12. It will not be possible to replace this diode with ordinary rectifier. It has too low performance, and at a frequency of dozens of Killerz he will warm up more than straightening.
But there is a replacement. Schottki diode is quite suitable for 15–20 A and reverse voltage at least 25 V. You can find such diodes in PC power supplies. There they serve for the same purposes. The diode, of course, needs to be put on a heat voltage.
The light bulb is miniature. It can be found in Soviet New Year garlands or use two by 6.3 V, included in series. Collect the rectifier, place it in the tool case, remove it through the made hole of the wire, we plow one part of the connector. The second is solder to the wires from the transformer. And the finalization is completed. Since the voltage at the output of the electronic transformer is alternating, the polarity of connecting the wires from floor to rectifier can not be observed.
As indicated above, there are transformers that provide a smooth launch of halogen lamps. Whether they are suitable for us? Quite. As soon as we connect this to the network, it will start and will go out for a working mode within 1-3 seconds. This will be clearly visible in terms of smooth flame of the H1 lamp. After that, the tool can be used without problems.
Important! When choosing an electronic transformer without protection against overload, it is necessary to ensure a supply of its power in 30–40 %. Otherwise, the block will either not “pull” the tool, or (which is more likely) will simply burn.
Household or professional
As you know, professional screwdrivers differ in greater cost, but this is no coincidence. They are made with a large margin of strength, for which better and expensive materials are used. In addition, they have greater power, which makes it possible to screw longer screws and/or work with more rigid materials.
The difference between professional and household electrical screwdriver in the resource
To solve a household or professional electric screwdriver, you need, evaluate the volume of work that will need to be done. If you start a construction or major repairs, you probably need a professional or semi.Professional model. If the tool is needed periodically-something to twist/twist something from time to time, there is more than enough domestic. With such work, the resource of the instrument pros simply will not be in demand. So choosing an electric screwdriver according to this criterion is not very difficult.
About amperes, volts (thoughts)
I will not go into the wilds of physics and explain in simple language
The effect of current on the body is complex and it does not make sense to take into account only one parameter. A classic variant of the fatal current is a variable with a frequency of 50-60 hertz, voltage above 36 voltage by current power from 0.1 amperes. With a decrease in the voltage, the current may simply not flow through the body, which, as you know, has its own resistance, with an increase in voltage, but a small current of current, an electric blow can also do without consequences. DC is less dangerous than the current current, but with an increase in the frequency of alternating current, its dangerous exposure is reduced and high frequency currents are used even in medicine. It is believed that Kilvaetamper, but the rest of the physicists do not remain on the sidelines.
The effect of electric current on each person individually. But it is generally accepted to believe that the current can be a deadly, expressed in amperes. For death, 0.1amperes are enough, at a current voltage of 36 volts.
And for individual individuals, as in this comment:
There are various ways of calculation, and for the lazy even in the tables,
P.S: And at least once it was interesting to know why the stampers are not killing?
It claims that for some models of produced shockers are the following parameters:.The current is impulse.Each impulse with a total length of about 120 microseconds.The frequency of the impulses. 20 times a second.Current frequency inside the pulse. 10 Killer.Current strength in the first period of impulse. Up to 3 amperes, then. It fades very quickly.
-The impulses are too short to cause mortal changes.Frequency. Too high to create a high current density through internal organs (obviously, selected to affect only the motor muscles on the surface of the body).The impulses are unstable, and damped
Plus, the electrodes of the shocker are never attached to different ends of the body. Therefore, if you do not try to specially intervene in the design, kill them. Quite difficult.
P.P.S: And you thought why the police do not use shockers during the rain?
How can you replace the “native” battery in an electric screwdriver
If in your electric screwdriver batteries have developed their resource, then they can be easily replaced. There is such a thing as the interchangeability of batteries. For example, under the PowerPlant brand, battery is available with compatibility with most popular brands of power tools. They are much cheaper than “native” batteries and are quite operational.
But if this option does not suit you, then the power elements in the block can be replaced with new. To do this, you will have to disassemble the battery block and extract the elements included in its composition.
Replacing the nutrition elements with similar
On some blocks you can see the fasteners that need to be unscrewed. But there are no screws on most of the battery blocks, since the housing is glued. To open such a block, you will need to carefully insert the screwdriver into the gluing place (shown in the photo shown) and slightly press so that the walls of the case are disconnected. The same actions need to be done around the entire perimeter.
After the opening of the block, you will see the power elements in it.
Next, you should look at the marking applied on the elements, write it down and select the same in the online store. Когда новые элементы питания будут у вас в наличии, их нужно спаять и установить обратно в корпус. To solder batteries, you will need a soldering iron and flux (alcohol for rosin or soldering acid), as well as tin. You need to take into account several nuances during soldering.
- You need to solder quickly, not allowing the battery to heat up, as it may become unusable.
- For compounds, you need to use “native” plates, soldering them from old nutrition elements (they have the right section and resistance).
- It is important to correctly connect plus with the minus of the battery. You need to connect the elements in series: the minus of the previous battery should be connected to the plus of a new, and the minus of the new battery. With the plus contact of the next battery.
After connecting all the elements, it is necessary to align the potentials on all batteries, since they differ. Carry one cycle of charging: connect the charger to the battery for the night, then let it cool for a day and measure the output voltage in turn on all elements. If everything went well, then on all batteries the indicator will be the same. Within 1.3 V.
Now the battery needs to be discharged by inserting it into an electric screwdriver and loading the latter to the maximum. The main thing is not to overheat the engine engine. Give him a little rest. Bring the battery to complete discharge. This procedure should be repeated 2 more times (full charge and full category).
Replacement for lithium batteries
Replacing Nicd elements with Li-Ion will also not be difficult. It is known from the school course that if the batteries are connected sequentially, then their voltage rates will be summarized. For example, your electric screwdriver works on a battery with a voltage of 14.4 V, which means that it can be replaced with four finger batteries of 3.3 V. This voltage will be enough, because the lithium battery does not “sag” too much when starting the apparatus.
It is recommended to buy batteries of well.Known manufacturers, for example, Sistem A123. The Lifepo4 battery of this company has a capacity of 2400 mAh, sufficient for the normal functioning of an electric screwdriver. If you buy food elements via the Internet, then they will cost you cheaper. In the region of 900 for 3 pieces.
When buying nutrition elements, pay attention to whether there are copper strips at their contacts. If they are, then the process of soldering is much easier.
It will also be necessary to purchase with alcohol flux soldering acid. In this case, overheating of the nutrition elements will be minimized. The soldering iron must have power within 65 watts.
We remade Ni-CD to Li-Ion
We will finalize an electric screwdriver with Ni-CD battery for 12 in the Interskol brand. First of all, we need to decide what elements and in what quantity we will put. Three lithium elements with a nominal voltage of 3.7 in each is not enough (11.1 in provided that the battery is completely charged, in fact). So we’ll put 4. A fully charged lithium battery of four sections will theoretically give 14. 8 V, but in fact, the voltage under load will not rise above 13, which is quite acceptable. As for the type and capacity, the choice fell on elements of the size of 18650, the capacity of each battery, and therefore the batteries in general. 2,600 mAh. You can buy such elements on aliexpress.
Batteries for finalizing an electric screwdriver
Since the elements of this type do not tolerate overlap and rejection, you will have to buy a special charge/discharge controller with the function of balancing of four cells. It can also be found on AliExpress.
Charging control board with a balancing function
Opinion of the Bartos.Specialist of the repair, maintenance of electrical equipment and industrial electronics. It is useful to ask a question! This board is also convenient in that it has protection against overload (more than 30 A) and self.Healing mode after eliminating the problem. That is, if the protection works, then to restore it is enough to release the tool button, and not pull out the battery and stick into the charger.
If everything is bought, then you can start the translation of our electric screwdriver from nickel to lithium. We take out the old battery and disassemble it. To disassemble the battery of the Interskol electrical screwdriver unit (it was we who chose it as an example for finalizing) a simple screwdriver is enough.