Originally Posted by vettster
If the screws were to hit the armature as it spins..it would most likely cut all the winding and the motor would not work at all.
The bearings are #$%^#d.
Try this.. take the motor out of the shroud and oil the bearings. Then put it all back together with the fan and run it up. Even if the oil only last for a short while, and no sparks are produced, you will know what the problem was. The reason you pay more for a solid motor like ARC is because they use Titanium bearing vrs stainless steel
I not sure how the screws would even cause this problem. The screws enter the motor end cap directly over the windings, and the windings ARE the stator in this brushless inrunner. Therefore they are not rotating. The magnets are the armature in this case and they are whats rotating in between the motor screws.
Cooked bearings seem like a likely cause of sparks, maybe worth me looking into. I have some lithium grease...