You will enjoy the speed and convenience.
I took a 18v engine from a broken screwdriver. The engine is suitable for anyone from 6V and higher. And used it for grinding and polishing metal surfaces.
The engine is very powerful, so you can power it with 5V, from a computer power supply, it will still pull with great power.
So.
Broken screwdriver.
The neck of a plastic bottle.
Three corks from plastic bottles.
Glue.
Velcro from clothes.
A piece of felt.
We disassemble the old screwdriver, pull out the engine itself.
We approach our removable nozzles.
In one of the covers, with an awl we make a hole suitable for the shaft of our engine. The cap should fit on the shaft very tightly.
Cut the thread itself from the bottle from the water. Using sandpaper, we adjust the joint for the thread of the cork.
We twist the cork half the thread. In this case, we first coat with polymer glue. After about 10-12 hours, the glue dries.
We put a blank on the engine pin, also smearing everything with glue.
Let the glue dry.
Fasten Velcro on one cover, on the second felt.
Now let's deal with removable nozzles.
Grind all the surfaces of the covers with sandpaper.
Cut circles for nozzles (felt and Velcro)
And glue to each other.
We clean sandpaper, polish with felt.
Everything is ready in principle.
Here's a video
In the process, I realized that I didn’t have enough grinding area, so I slightly increased the surface area.
Instead of 3 cm. I added 5 cm. Plane.
The process is the same, just instead of one and a half ears, I took bottles of 5-6 liters (lids and neck).
For reliability, I put a suitable washer on the motor shaft. Then I pulled a cover on the shaft and secured it with a cambric.
Filled everything with a good layer of thermo glue.
Do not forget about alignment. This time I got a more manufactured machine.
