How to convert an angle grinder to 12 V

If your small-power angle grinder is out of order, then you can take this opportunity to convert it to a constant supply voltage of 12 V. At some points, it will be an indispensable assistant for you, in the sense that it will work anywhere from a battery.
For the conversion you will need a 775 series motor (). Electric motors of this series are high-speed and very powerful. They operate on direct current, at a voltage of 12, 24 or 36 V, depending on the design.

We convert the grinder from 220 V to 12 V


We open the body of the angle grinder by unscrewing the screws securing the gearbox.
How to convert an angle grinder to 12 V

And the rear casing screw.
How to convert an angle grinder to 12 V

We take out the gearbox with the rotor.
How to convert an angle grinder to 12 V

We remove the stator from the housing; it will no longer be needed.
How to convert an angle grinder to 12 V

It would be a good idea to disassemble the gearbox and lubricate it with new grease.
How to convert an angle grinder to 12 V

How to convert an angle grinder to 12 V

Then we close it back. Next, we saw off the rotor shaft from the gearbox with a hacksaw.
How to convert an angle grinder to 12 V

How to convert an angle grinder to 12 V

The impeller, which was used for forced cooling of the motor, can be removed with pliers
How to convert an angle grinder to 12 V

We fix the gearbox and drill the shaft in the center, with a drill of a diameter slightly larger than the shaft of the new electric motor.
How to convert an angle grinder to 12 V

Now we drill a hole on the side and cut a thread for the screw.
How to convert an angle grinder to 12 V

How to convert an angle grinder to 12 V

We insert the motor shaft and fix the screws.
How to convert an angle grinder to 12 V

We wrap the engine with electrical tape, increasing its diameter to fit the inside of the housing.
How to convert an angle grinder to 12 V

We insert it tightly into the body.First remove all the brushes from the old motor.
How to convert an angle grinder to 12 V

We assemble the tool in reverse order.
How to convert an angle grinder to 12 V

Solder the contacts to the new motor.
How to convert an angle grinder to 12 V

The grinder is ready to work.
How to convert an angle grinder to 12 V

We try to cut something off with a cutting disc.
How to convert an angle grinder to 12 V

Of course, the power has changed a little for the worse, but it is still quite possible to work.

Watch the video


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Comments (7)
  1. Guest Victor
    #1 Guest Victor Guests 23 October 2019 20:15
    11
    1) no need to remove the impeller - the new engine also needs cooling;
    2) do not cover the engine ventilation holes with electrical tape.
  2. thought
    #2 thought Guests October 24, 2019 09:01
    5
    With such speed it is good to cut bicycle spokes
  3. Guest Alexander Zakharov
    #3 Guest Alexander Zakharov Guests 26 October 2019 08:14
    7
    It is not always possible to make a hole on a lathe EXACTLY in the center of the shaft, but here... the tip of the shaft is not trimmed, according to the photo it is drilled with an electric drill... 146%, there will be terrible beating... the bearing on the engine will break instantly.
  4. Guest Nikolay
    #4 Guest Nikolay Guests 26 October 2019 13:23
    3
    It's cheaper to replace the motor.Where, engineer, are you going to put the overheating if it still spins under load? In duct tape?
  5. ALEXEY BULGAKOV
    #5 ALEXEY BULGAKOV Guests 9 December 2019 17:02
    2
    ruined the instrument
  6. Victor Zaporozhye
    #6 Victor Zaporozhye Guests 18 December 2019 16:03
    0
    The idea is not new. I wanted to carry an angle grinder and a 12V screw in the trunk. I didn’t like your option - the engines are weak. I used an electric motor from the MZK-3 aircraft unit - there are a lot of them on the market (27 V 10A, 12000 rpm) - it works great both from the charger and from the battery. A little modification is required: the reverse stator winding should be connected to the main winding.
  7. Hass
    #7 Hass Guests June 29, 2020 11:45
    3
    He wrote that it was completely broken, and rebuilt it using a battery, and here, “it’s better to buy a new engine,” etc. did you even read the article?