Why an electric screwdriver won’t tighten. Replacement tapered type of part

How to use an electric screwdriver: step-by-step instructions

An electric screwdriver can operate from the battery or from the mains. The type of operation of the tool can be different, in connection with this it is customary to allocate such its varieties:

Screwdrivers are divided into several types according to the type of work: electric screwdriver, drill-electric screwdriver, wrench and cordless screwdriver.

The operating principles of each of these tools are similar, the difference between them lies in the functions for which they are designed.

Electric screwdriver drill additionally allows you to drill a hole, and a regular screwdriver is designed only to work with fasteners. A cordless screwdriver is for bolts and nuts, and a cordless screwdriver is for fasteners with Phillips-heads, for tightening and loosening them. The last device has the lowest power of all.

An electric screwdriver is indispensable if you need to make a suspended ceiling, mount drywall or sheet insulation. The absence of this device greatly complicates the work, in the course of which it is necessary to screw many self-tapping screws or other fasteners. And in everyday life, when you need to screw in or unscrew 1 screw, doing it with an electric screwdriver is much more convenient and faster.

Types of failure

typical cases when the chuck of a Metabo, DeWALT and other electric screwdriver jams.:

  • When trying to use a drill bit of the maximum allowable size, the cams are dilated to the maximum, after which it is not possible to bring them together with the normal forces;
  • the drill bit or bit clamped in the chuck can not be extracted. cams will not be separated. It is not uncommon for them to be jammed unevenly, making it difficult to hold the drill bit.

less often jamming of the jaws occurs when they are freely moving when clamped or unclamped. usually caused by debris, scale, shavings, etc.п., caught under the curved part of one of the cams.

What tool to use

The choice of screwdriving accessories is not too great. Screwdriver and screwdriver, sometimes a hammerless drill is used instead. A screwdriver is a useful tool, but not very functional. This will come in handy if you only need to make a few fasteners in wood or other fairly soft material.

A screwdriver is better for a lot of work, especially if you have to screw into metal or hard wood. Also, the bit in this tool can be exchanged for a drill bit to make mounting holes, which may be necessary when working with thin wood or thick metal.

Before you screw in a self-tapping screw, you need to make sure that your screwdriver is up to the task. Inexpensive Chinese models have low power and are used only for work with wood, plasterboard, plastic. If you have to fixate in a concrete or steel construction, you will need a professional screwdriver. Sometimes a cordless screwdriver is not powerful enough for this kind of work, a mains-powered tool may be required.

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Bits. bits with differently shaped heads. are also important for making a secure fastener. They must be of high quality and exactly match the type of slots on the self-tapping screws.

How to disassemble the tool?

First of all, you should remove the battery from the compartment, so it does not accidentally fall out and break. Free the chuck from the clamped bit or drill bit. Then it is necessary to “halve” the case. For this take a suitable screwdriver. Most likely the slots in the housing screws will be Phillips. Sometimes the screw holes are covered with decorative plugs and must be removed.

Tools that may be needed (arranged in descending order of need):

  • Phillips screwdriver;
  • pliers;
  • a puller for lock washers;
  • pliers (for pulling out cotter pins and pins);
  • socket wrench 19 22 (for unscrewing the chuck);
  • a small hammer;
  • vise.

The screws are located all around the perimeter of the housing, there are about 10 or 15 in total. Lengths are usually the same, but you may find some long. Screws from the housing are set aside separately so as not to be confused with others that may still need to be unscrewed. After the screws have been removed, the upper part (screws side) of the housing is carefully separated.

Diagnose and repair electrical problems with an electric screwdriver

If you have a cordless machine, then the first thing you need to do is to check the batteries in the battery pack by taking it apart. There are collapsible and non-collapsible blocks. In the second case you need to carefully insert a screwdriver into the bonding of the walls of the block and slowly separate them.

Next, you need to measure the voltage at all the “banks”. The voltage rating is indicated on the case of each battery. The voltage should be slightly lower than indicated, but the same on good batteries. Faulty batteries will differ significantly from the rest in voltage output. they will need to be replaced. New batteries can be purchased online.

It is important to solder them correctly, that is in series: the plus of one battery is connected to the minus of the other, and the plus of the second battery to the minus of the next, etc.д.

If you are the owner of an electric mains screwdriver, the algorithm for checking is slightly different. First, you need to unscrew the housing of the machine and remove one half of it. Get a tester and “test” the power cord for breaks. If the cord is intact, check the start button. Check when the button is depressed to see if there is a circuit on the output terminals. If the button is defective, it must be replaced or repaired. How to do this will be discussed below. If the button is working properly, the problem may be in the electric brushes or motor.

Repairing a Button

Below is the wiring diagram for a cordless electric screwdriver.

From the diagram, you can see that the button has 2 wires to the battery and 2 wires to the motor. Also connect 3 wires from the transistor, which is responsible for rpm control, to the button. To understand the electric screwdriver button, it must be disassembled. All wires going to this part can be unsoldered. They will not interfere with disassembly.

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Next, remove the button cover. At the points indicated by the arrows in the picture, use a knife and screwdriver to pry out and push out the latches, and then remove the cover.

After removing the cover you will see the reversing compartment. But the mechanism of the button will still be inaccessible. Using a soldering iron, disconnect the 2 elements (arrow in the following illustration).

Carefully take out the element number 1, and then remove the cover that covers the mechanism compartment of the device.

Hold the return spring and remove the mechanism from the housing.

You will see worn pads on the defective button.

The contact pads wear out quickly due to the bad quality of the metal. Fine metal dust from worn out contacts accumulates between them and short circuits the pads. This results in spontaneous starting of the machine.

Remove the metal dust using absorbent cotton and rubbing alcohol into it. If it is not possible, you may scrape it with a knife. After these actions spontaneous start of the device will stop.

If the speed controller does not work, it means that the transistor is burned out and must be replaced.

Replace the brushes

To check the condition of brushes it is necessary to disassemble the motor by bending away “tendrils” located on the end of the case.

Next, knock the rotor from the motor shaft with a light hammer.

First remove the cover, in which the electric brushes are located.

In the following picture you can see that the collector is black. This means that it is contaminated with dust from the brushes. As a result of dirt on the collector and the grooves between the plates, the motor output will drop and the brushes will spark. It is necessary to wipe the collector with absorbent cotton soaked in alcohol, and clean the grooves with a needle.

The following photo shows what a clean manifold looks like.

If the brushes are worn out, they need to be replaced. For some screwdriver models it is difficult to find on sale original brushes. But you can find brushes that are the right size, and then use a sharpening machine to trim them and connect (solder) to the brush holders.

Sometimes you have to cut a groove in the brushes to replace them. It depends on how they are mounted.

To get a better understanding of how the brushes are replaced, you can use the following video.

electric, screwdriver, tighten, replacement, tapered

Electric screwdriver repair: the main faults of the tool

Electric screwdriver belongs to the category of tools, which are often used not only in construction and repair work, but also in everyday life. In the course of time it is characteristic for any mechanism to break down, and this happens to screwdrivers as well. If such a thing happens, then there is no need to rush to throw away the tool, as you can perform self-repair of an electric screwdriver. In this article you will learn about how to give to repair an electric screwdriver without resorting to the help of specialists.

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The battery has stopped charging

If after checking the contacts it turns out that the circuit has no damage, and the charger is in good working order, you will have to replace the battery. Cheap “old style” NiCd batteries are more likely to fail before the tool itself. Completion of a used unit with a modern lithium-ion battery is not reasonable: the purchase price will be higher than the residual value of the electric screwdriver. It is better to think about buying a new model of the tool.

The usefulness and convenience of using an electric screwdriver for home repair is beyond doubt. With the help of this tool it is much faster and easier to connect wooden elements. Do-it-yourself screwdriver repair has become a necessity for many.

Scheme of the device of a cordless electric screwdriver.

Any tool, even the highest quality one, fails at some point. There are many reasons for this. Repair of an automatic electric screwdriver is not an exception to the rules, it is quite a natural phenomenon, and you should prepare for it in advance.

electric, screwdriver, tighten, replacement, tapered

The causes of failure of different screwdriver brands

Screwdrivers usually break for common reasons, regardless of their brand and cost. They are most often caused by improper actions of the user. Among them:

  • Operating errors. The equipment is used only for its intended purpose. If you start drilling concrete with a low-power device, it will only work for two or three days.
  • Exceeding the allowable operating time. Screwdrivers are designed for home and professional use. The first should not work more than a couple of hours a day, the second is allowed to operate for longer.
  • Failure to observe the storage instructions. Do not keep in damp or cold places. Moisture can oxidize mechanical and electrical parts, and cold can destroy batteries. In addition to dampness, the devices are subject to direct sunlight. Screwdrivers that have been overheated are likely to burn out during operation.
  • Incorrect charging of batteries. It is not allowed to leave them discharged for a long time, or to exceed the charging time. Run the tool at least four to eight times a month and let it run for a short time.

by following the care and usage recommendations, the owner is assured of a long life, regardless of whether the product was manufactured in china or europe.

If the electric screwdriver breaks down, it is possible to diagnose the device and repair it yourself. Most of the broken parts are impossible to repair or difficult enough, so they will need to be replaced with serviceable. When buying parts, you need to check that the new items match the old ones. If they don’t, at best the technique can’t be assembled, and at worst it will be completely ruined.

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