Your idea is really great. I don’t know if there is such a thing in the market. It would be great if there was such a machine in the classroom. I majored in mechanics. This thing is not difficult to implement. .The main thing is to make the thing light, and it will be better if you add some water to remove the chalk dust. The things you need to master include basic mechanical knowledge, basic knowledge of electric motors, and you can also use manual instead of mechanical manufacturing knowledge. Then there are It depends on your creativity! I hope you can succeed! Serve our teachers