The Secret Society of Lathe Trolls

Hello! Thanks for the hints. At the moment I use such a simple 12-220 inverter circuit, in it I made a frequency adjustment. The output signal is far from a sine, but the electric motor, due to the large inductance of the windings, works well

Or here is another design, described in the magazine "Radio" in 1941. It uses an asynchronous motor from a fan with a capacity of 50 watts. (But 50 watts is the power consumption, useful power on the motor shaft there is no more than 7 watts). The cone pulley on the motor shaft is used to regulate t...

Understood, thanks for the explanation. An interesting thought. In one of the Soviet tape recorders (the scheme was probably copied from some foreign device) there was a scheme for stabilizing the engine speed. A metal disk with slots and an ordinary magnetic head from a tape recorder were used as a...

I don't quite understand what you mean by the term "electromagnetic brake". Do you mean slowing down an asynchronous motor by applying direct current to the windings as in the circuit I attached to this message?

I think that the motor should be synchronous, not asynchronous. The speed in an asychronous allways decrease as it developes torque. Synchronous motors are rare to find... Hope this helps. 12051180933.jpg Such synchronous electric motors are widespread in our country. But they are not suitable for ...

Thank you so much for your help! Yes, the speed slows down only when cutting. In the Soviet Union in the 30's and 60's the subject of home recording was very popular, so there were several books on making your own recording machine (in our country the state did not produce such machines for home use...