How to repair angle grinder (grinder) with his own hands: Master Class

  • Dec 26, 2019

Use of the power in the work greatly increases its quality and efficiency, as compared to the manual.

It is therefore very important that it worked fine without a hitch.

Usually it is enough to carry out maintenance on time and to use the tool carefully, according to the manufacturer's recommendations.

But mainly to service and audit does not always happen in time, and have to do it when the tool stops working completely.
But mainly to service and audit does not always happen in time, and have to do it when the tool stops working completely.

The following article provides a common breakage angle grinders and the method of its elimination.

For example take the "Bulgarian" company STERN 1020 W power. The machine suddenly stopped working completely without any visible reasons.
For example take the "Bulgarian" company STERN 1020 W power. The machine suddenly stopped working completely without any visible reasons.

Moreover, the instrument does not emit any signs of life, no specific buzz, no burning smell, as often happens.

In appearance, it becomes clear that the "grinder" is already repaired.
In appearance, it becomes clear that the "grinder" is already repaired.


In general, a very common cause of failure is the machine - erasing graphite brushes to the maximum level.

Brushes do not reach the contact armature that breaks the circuit of rotor windings and stator. But this is not the worst thing that can happen. Sometimes due to a breakage of the spring at the end of the brush, for some time performing its role, leading anchor in complete disrepair.

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Cases, these unpleasant things due to the fact that the user is so busy with the production of construction and other activities that little things like to see the length of the brush, there is simply no time.

Based on the foregoing, the first thing you need to pay attention - this course brush.

In this model, such a procedure is carried out is not difficult and very convenient.
In this model, such a procedure is carried out is not difficult and very convenient.

You do not need to disassemble the unit, it is sufficient to unscrew the plastic plug with a screwdriver and remove the brush.
You do not need to disassemble the unit, it is sufficient to unscrew the plastic plug with a screwdriver and remove the brush.

Check both brushes need.
Check both brushes need.

The length of these brushes is sufficient for normal operation. Moreover, even the ends - in contact with the rotor contacts - absolutely not burnt, indicating that the serviceability of the windings.

Set the brush back and proceed to disassembly of the handle, where the start button and the switching direction of rotation

Unscrew the four screws securing the plastic handle to the body.


Next, put the "grinders" on its side and unscrew the screws on the handle.
Next, put the "grinders" on its side and unscrew the screws on the handle.


Carefully remove the top cover of the handle.
Carefully remove the top cover of the handle.

Here you can see: the terminals for connecting the power cord to the button, ferrite coils and noise suppression capacitor.
Here you can see: the terminals for connecting the power cord to the button, ferrite coils and noise suppression capacitor.

All this is in the collection should be in place, the wires do not cover loosely and was transferred by "the village."
All this is in the collection should be in place, the wires do not cover loosely and was transferred by "the village."

Remove the key from the seat and check the integrity of the cord.

This will help in the meter or any other device capable to show continuity.

In this case, a voltage pointer with a "continuity".

Connect one end of the device with one of the terminals on the button, and the second, alternately with the pins on the plug.

On one of the pin, the unit should show circuit that happens.


Next, do the same operation on the other terminal.
Next, do the same operation on the other terminal.

The device is shown open, it means that somewhere in the cord has damaged.

Immediately possible to think that break on twisting, insulated tape. But when you try to move the front rubber pipe, eyes opened a place of insulation damage.
Immediately possible to think that break on twisting, insulated tape. But when you try to move the front rubber pipe, eyes opened a place of insulation damage.


A careful examination of the place, it is clear that is damaged and the inner conductor, just the same color as that of the Start button.
A careful examination of the place, it is clear that is damaged and the inner conductor, just the same color as that of the Start button.

As the cord is already insulated by the injury, and it is very close to the handle, it can also be removed, snap off the section of the cable with pliers.
As the cord is already insulated by the injury, and it is very close to the handle, it can also be removed, snap off the section of the cable with pliers.

Nothing that the cord is shorter by 10 cm. but now he has no injuries.
Nothing that the cord is shorter by 10 cm. but now he has no injuries.

We clean the wires and reconnect them to the button terminal
We clean the wires and reconnect them to the button terminal

Where, a "plant" does not matter, as the current variable.

Check the degree of clamping, jerking on the wires.
Check the degree of clamping, jerking on the wires.

Next, put the button and other elements in the handle compartment, making sure that when you install the top cover wires are not damaged.
Next, put the button and other elements in the handle compartment, making sure that when you install the top cover wires are not damaged.

Hold the wire clamp and put on the top cover.
Hold the wire clamp and put on the top cover.

It should be tightly against the lower part.
It should be tightly against the lower part.

Hold the fastening screws, both vertical and horizontal.
Hold the fastening screws, both vertical and horizontal.


Now, turn on the power plug into a network and click on the "Start" button.
Now, turn on the power plug into a network and click on the "Start" button.

At the same time should make the motor and gearbox machines.
At the same time should make the motor and gearbox machines.

what happens in this case, so the repair can be considered successful.

It should be noted that this situation with a cord - is not only the prerogative of angle grinders, but also any other electric hand tools, since they have to work to rotate, and this has a negative impact on the cable power.