How to properly install the switch on the drill

typical tool failures

Knowing the construction of an electric drill, it is not difficult to determine the cause of why one or another of its functions does not work. It should be noted that it is possible to avoid breakdowns of the power tool, if periodic preventive work related to the replacement of the lubrication of the mechanical parts.

After completing drilling work, it is necessary to remove dust from the tool, especially from its ventilation holes. The nature of faults are divided into electrical or mechanical nature of occurrence.

Electrical damage

This kind of breakdowns occur due to exceeding the permissible load on the device and violations in its operation. If the tool fails to start, or the reverse or speed regulator does not work. often to restore serviceability it is required to disassemble the start button and clean all places connected with electric contact.

If there is a smell of burning, there is an overload in electric motor operation. If this is the case, first check the state of the brushes and windings, examine the power cable connection points for burning. Burning up is caused by dust penetration, resulting in increased contact resistance and consequent heating. Electrical faults can be easily calculated using a multimeter and visual inspection.

Mechanical Failures

Mechanical faults are more difficult to diagnose. These kinds of failures are usually accompanied by a strange sound and can’t be eliminated without disassembling the tool. In case of poor fixing of the drill bit in the chuck it will be necessary to replace it, because the wear of the toothed connection can not be repaired by yourself.

If a wedge occurs during operation, it is caused by a damaged gearbox or bearing. If you disassemble the device, you will immediately see the damaged unit. Worn gears or splines will indicate the need to replace them. Bearings are checked by jiggling them on the shaft. If the movement is not smooth or if you hear unusual noises, the bearing will be replaced. After you can find the faulty assembly and repair it, before you put the device back together, you need to clean the gearbox of old grease and apply new. Then the machine will be good for many years to come.

Repair your Einhell Electric Screwdriver, Repairing the Field Effect Transistor.

Einhell. I didn’t want to buy anything for it, I had to rebuild it at the collective farm

The motor rotation direction switch is on the top. The direction of rotation of the electric motor depends on the polarity of the voltage applied to it. A DC collector motor has one winding. The winding is located on the rotating part of the motor called the armature.

In order to create the rotor torque, its winding is placed in the magnetic field of two permanent magnets located inside the stationary part of the motor, called the stator.Changing the direction of current flowing through the armature winding, using the directional switch lever, changes the direction of rotation of the working tool.

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The switching mechanism can be detached from the button by lifting the fastener at the backside of the button. There are two power wires, plus and minus, coming from the lower part of the button. By changing the rotary drum switch, the connection of these wires to the beginning, or the end of the armature winding, changes the direction of rotation of the electric motor.

The lower part, where all the electronic stuffing is assembled, is the most interesting node. Here is the electronic circuit of the pulse-width regulator, which controls the power transistor. This transistor, depending on the position of the PWM control resistor, opens the power transistor of an electric screwdriver, through which some electricity flows to the motor winding. The magnitude of the opening of this transistor, and therefore the magnitude of the current flowing through it, determines the speed of rotation of the electric electric electric screwdriver motor.

This is how a button on an electric electric screwdriver or a drill with a soft starter works.

For example, remember that opening the housing can cause all parts and loose parts to simply fall out of the housing. Naturally, this should be avoided, because then it will be quite difficult to put the device back together. You can do this by gently lifting the cover, marking the exact location of the parts on paper.

The button is repaired as follows:

  • First pick up the clips for the cover, and then it is carefully pulled together;
  • All corroded and darkened terminals are cleaned of carbon deposits, for which you can use alcohol or emery cloth;
  • Reassemble the tool, making sure that all parts of the device are in their place, and check the performance of the drill. if nothing has changed, change the part;
  • Turnover regulator is filled with compound, so if the part fails, just replace it;
  • A frequent failure is the erasure of the working layer under the rheostat. it is better not to repair it, just a waste of time, it is better to buy a new one and replace it.

Many people wonder where to get a similar scheme? First of all, it should come with the tool when you buy it, but if there is no diagram, or you have lost it, you will have to look on the Internet. Only with its help you will be able to do the repair properly, without errors. By the way, the speed control button and the reverse control button are located in different places, and therefore you have to check them separately.

Diagram of connection of the switch of a scoop drill

Quite often the electric drill stops working because of breakage of its switch with a speed control (it does not turn on, the number of revolutions is not regulated), we disassemble the drill something trying to do, and when we understand that the case in the switch with a speed control, it turns out many wires from it are already broken and what was unknown where. To solve this problem you will need the information: how to replace the switch with adjustment in the drill: In order to make the motor starts working in the opposite direction it is necessary to swap the connection of wires to the brushes (in the button with reverse this is done with the lever switch). I want to draw your attention when buying a switch, it must match not only the size, but also the power of your drill. Let’s calculate: we have a power drill 650w, P=UI, I=650/220=2.95A, so we need a switch for U=

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Working of the tool without a button

The drill can be connected directly, except for the control unit. In addition to a flathead screwdriver and Phillips head screwdriver we need electrical tape and a utility knife. On a more solid connection it is possible to involve the soldering iron.

Carefully remove the starter charger. Ant. The final block according to the instructions above. Disconnect the wires connected to the button and connect them to each other. If you intend to use the tool extensively, you should solder the wires. For a one-time job, the usual twisting and insulating is enough. It is better to cover the soldering with the jumper.

The winding includes two wires. Those wires that run diagonally (from the coils), connect to the brushes and insulate the connection points. Connect the other pair to the power cable.

It means a lot! If after turning on the cartridge starts to rotate in the wrong direction, because the pairs must be reversed: brushes to power, or vice versa.

Most Makita torches (models HR2020, 2432, 2440, 2440F, 2450, 2455, 2475 and 2641) use the type switch TG813TLB-1.

To have it inspected and/or replaced, the following tools must be prepared:

The procedure for repair/replacement of the power button on a Makita 2450 is as follows:

Useful Tips

It is not uncommon for even professional equipment to fail quickly. This happens due to the tool working with a significant overload of the electric motor. The power unit should not be allowed to overheat and pauses should be taken periodically. Sometimes a serious breakdown is caused by negligent handling of the tool during operation or storage.

Thoroughly clean the torch from dust after each use. Use a soft cloth or tissue to wipe not only the housing of the power tool, but also the ventilation slots.

Do not use the power tool outdoors when it is raining or snowing.

Regularly inspect the carbon brushes, which are a responsible part of the electrical circuit. they conduct the current to the collector and in operation gradually wear out and need to be replaced.

Do not buy non-original components of dubious quality, which can lead to more significant damage.

Wiring diagram for replacing a drill button

If for some reason the drill stops working, you need to find out what the cause is. The first thing to do is to check if there is voltage in the extension cord and the power outlet. You can do it with a single-pole indicator, it will only show the phase, but if a break occurred on the neutral wire, it will be useless. The easiest way is to plug another appliance into the same extension cord and the same socket to check that it is in working order.

How to change a switch on a drill

Note! All electrical items should be checked according to a diagram.

It is better to check the button of the drill with an ohmmeter or a tester according to its diagram. Connect the device to the pins on the plug, the device does not respond, because the start button is not in the operating position. After you press it, it will indicate or beep to tell you if the circuit is intact or broken. If the cause is a button, consider the construction of the drill button and its repair.

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A tester is not always enough to test a button. It is connected with the fact that most of the buttons have a smooth adjustment of rotation speed, so a simple tester does not check them correctly. For a proper check you will have to use a special circuit. Often in a drill one wire is connected to one terminal. Therefore, all terminals are tested at the same time as the button is pressed. If the light turns on, then there is nothing wrong with the button, but if not, then the easiest way to fix the problem is to replace it.

Important! In order to make the motor work in reverse, it is necessary to swap the connection of the wires to the brushes.

Doing the replacement, it is necessary to take into account that the scheme can be ordinary and with reverse. In this regard, the replacement of the drill button should be carried out strictly according to the scheme. It is necessary to pay attention to the fact, that it has to be of the right size, and it is necessary to match the power of the drill. To calculate the necessary power is quite simple: for example, the power of the tool is 650 W, we use the formula P=UI and obtain I = 650/220 = 2.94 А. So we need a button for 2.95A for our drill.

Button repair of our drill is a rather complicated process, it requires certain skills. It should be understood that when you open the housing, many of the parts will simply fall out of it. To avoid this, lift the cover smoothly and mark the location of all parts. The button is disassembled and repaired in the following order:

  • Hook the locks of the protective cover, and it is pulled down;
  • Clean off any blackened terminals with alcohol or fine-grit sandpaper;
  • Then everything is reassembled, and if the operation is not restored, the replacement takes place;
  • The speed regulator is completely filled with compound, so if it is out of order, it only needs to be replaced;
  • Another common breakdown is the erasure of the working layer beneath the rheostat slider. There is no sense to repair it, so it is easier to replace the whole button.

In order to know how to connect the drill button, you need to work on the diagram, which should be available with the tool. If it is not available, you need to find it on the Internet. Only with its help the repair and connection can be done quickly and correctly. Tip! The speed regulator and the reversing control are in different housings, so they must be checked separately.

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