I own a proxxon FBS 115/E that is useless here in France since it does not work on grid's 230V.
After opening it, I've found a very simple hashing circuitry with a Triac and a low pass filter to trigger its gate. I've reverse engineered it for you below (wasn't that hard). The motor is a DC one I think, since it is connected to the circuit through a bridge rectifier of 4x1n4007 (not represented on the circuit for sake of clarity).
My feeling is that I can somehow modify it to adapt for 230V. All components are 230V rated, except for the motor for which I have no clue of its specs, and am very afraid of ruining it if ran straight on 230V. I wrapped my ahead around a few hours but still stuck.
What do you think, is it doable ?
Of course, if someone has a Proxxon fbs 240/e, feel free to take a picture and send it here