Well it's true that fans, being delicately balanced, may have fragile (or brittle) bearings.
Ball bearings might make more noise if jewels because the necessary play between balls on a race makes them clink. That's a rattle when fast, and a buzz or hum at higher speeds. Jewels would clink louder, I guess. Packing the races with thick grease and sealing them is out of the question for tiny fan bearings.
Jewelled roller bearings should perform wonderfully. Cost? Balls are cheaper. Steel is cheaper.
|