Ok, so here i want to give a confirmation of my process to spin the rotor and cast the epoxy into it. Using some simple 3d printed rings and some tape, rubber rings and so on to build a tight cylindric room to cast the resin in.
Normally i cover all magnets and remove the redundant epoxy on a lathe risking the surface of the magnets. The answer is another coating.
The result is outstanding. The epoxy holds its form for at least 15 years. I have built model planes and own them still, and they are good optical and feel ok.
The spinning thightens the epoxy by centrigual force and its absolutely homogen, perfect in any way, professional.
How can one build a small machine, a setup of two motors which are directly coupled.
To fulfill two uses:
1: casting a rotor by turning a rotor by a motor.
2: testing as a dyno