One more thing - an unbalanced motor spinning at 24,000 + rpm will destroy itself in short order. I suspect that the motor itself will be the least of your worries.

At the same time, is this engraving device for a pantograph, or similar, such that an off-the-shelf engraver would not be suitable? There are some pretty good ones out there.

https://www.gesswein.com/p-2557-fore...Cs5 QQAvD_BwE

That for the price will probably be competitive with your home-brew at the end of the process.

Peter Wieck
Melrose Park, PA