Problem: Venerable Patton High Velocity Air Circulator (henceforth referred to as "fan") stopped working. Took it apart, cleaned off years of dust. Showed the kids the copper coils that generate the electromagnetic field that causes the disc to rotate so that the blades turn. Diagnosed that, for tribological reasons I can't determine, the generated EM field is no longer strong enough to overcome the initial inertia of the disc, even after applying lubricant.
Solution: keep a screwdriver handy to give the fan a little push, and it will keep the blades moving after that.
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