Modifying a stepper motor by drilling a hole down its shaft probably qualifies for the satisfying mod of the year award. That’s what [Russ] did to make needed improvements to his CNC flat-coil ...

This modular coil is intended to be used in motor and generator applications, and features a 3D printed structure to wind your copper about as well as a series of ferromagnetic machine screws and ...

F. R. HAIGH has recently compared the relative advantages of magneto and coil ignition used for generating the explosions which occur in motor-car engines (Students' Quart. J. Inst. Elec.