An momentary metal-on-metal scraping sound only at very slow speed when the fan is starting or stopping. Or when I turn it by hand. Obviously related to the rotation - there is one particular point in the rotation where the scrape occurs. The scraping does not involve the glass or the exterior housing.
The fan is several years old, and I think the fan blades are not perfectly level with the motor housing any more, So until the blades start to "fly" and level themselves out something (flywheel?) is hitting something at one point in the rotation. If I "adjust" the blades by hand to be more level this fixes it - once.
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There are two probable causes. One, the light housing has been pushed/bent up into the rotating assembly, which is possible if the fan were ever removed from the ceiling and sat on the glass.
If it has never been removed however, the most likely cause is that the Allen Set screw on the flywheel has loosened allowing the flywheel to slip down the motor shaft. It's a purely mechanical problem and if memory serves, to get to the flywheel, you remove the light pan and it's right there. Find the set screw, loosen it enough so that the flywheel is easy to move up and down and raise it up a bit and then cinch it down tight. It's a fairly common problem and for the life of me I cannot understand why Casablanca would not use loctite on that set screw. I mean you pay $500+ for a fan, it should outlast you, right?
Grinding indicates failed bearings. This is causing excess load in the motor and that is causing the flickering. This is not a user repair and would like cost around $130.00 for labor and bearing assuming you find a shop willing to do it. Most fans have pressed bearings and are very cheap.