Looking good Jetijs, Man I wish I had a CNC machine.

Well now, I almost finished my test thingy. It is based on the idea I explained earlier, using existing cores from normal induction motors. only the housing and rotor is custom. Well the rotor is of solid steel and the axle is aluminum. I know the solid steel sucks big time since it will bust in to flames in minutes (due to Eddy Currents) I'm not joking either since I made a experimental generator with solid steel cores at one time and I tell you within 1 minute the cores was over 80 degrees celsius. (rpm doubled under full load though, but that is a different story) But anyway I guess it should be alright for short 'tests'. Extreme care is taken in precision machining. And so I can say that it has an 0.07mm airgap on each side. So a sheet of paper will barely fit. I also have taken metal expansion into account and measured that the rotor will expand like 0.05mm at about 100 degrees celsius. The bearing are conical 'self centering' rolar bearings. And due to the housing construction you can adjust the bearings in case it has some play in it. The stator is not wound at this moment.

Kind regards,
Steven