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How to make a water pump

Master class on how to make a powerful, low-voltage water pump for various needs. For example, pump out a barrel of water for watering plants, etc. The pump works perfectly with a 12 V battery, which is its paramount advantage.

 The 775 electric motor is the first thing you need. You can buy it on Ali Express via the link . Or find a similar one.

  • Fitting for PVC pipes. The pump body will be made of it.

Making a water pump

We take an adapter from a diameter of 50 mm to 32 mm.

And a plug for a 50 mm pipe.

Place the holes for the engine in the plug: two for the fastening screws, one for the shaft.

We drill and deburr.

Now you need to cut off the bottom part. We mark a straight line by rotating the plug.

Saw off with a hacksaw. Using sandpaper, level the surface and get rid of burrs.

We also cut off the skirt of the adapter in the same way.

We combine the adapter with the plug to check the flatness of the surfaces.

We take a small piece of PVC tube 20 mm in diameter and cut it off at an angle of about 45 degrees. Next, you need to create a rounded surface for the trimmed edge. To do this, we wrap the adapter with sandpaper and grind the edge of the tube until a circular shape is obtained.

In the adapter we make a hole for the tube.

We glue the tube into the hole using epoxy glue.

Let's take a disposable syringe and check how tightly it fits on the motor shaft. If tight, then that's okay, that's what we need.

Cut off the tip of the syringe.

To make the impeller, you need to cut a square out of aluminum. Make a hole in it, so that the skirt of the syringe fits tightly.

We mark the square into 9 parts.

Draw diagonals in squares through the cell. See photo.

Cut off the corners with metal scissors.

We bend the squares. See the photo:

Cut out a gasket for the engine from an unnecessary camera from a bicycle or car.

We take the motor with propellers.

We put on the gasket, put on the plug and fix it all with screws.

Then we put on the cut-off pipette from the syringe with the skirt to the motor.

Next, we put on the impeller. Everything should fit very tightly. It will not be superfluous to glue everything with epoxy-based glue.

Cut a ring out of a 50 mm diameter pipe, approximately 10 mm wide. Insert half into the adapter. Remove the part that is visible through the hole.


Putting the pump together.

We glue the joint with hot glue.

We put on the corner fitting on top of the tube.

And in the adapter we also glue an adapter from a diameter of 32 mm to 20 mm. We fix it with hot glue.

We insert the tube. This will be the water intake.

The time has come for testing. For reliability, you can fix the motor on the board by tying it with a metal clamp.
We will connect the system to a voltage of 12 V. We lower the intake pipe into a container with water. We apply voltage and the pump works.

Watch the video


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