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Cake day: June 17th, 2023

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  • Yeah, main bearings on car, like crankshaft and cam are solid bearings and journals. Wheelbearings are a timpkin flat roller, I think, to support a lot of load and thrust. They are packed and sealed. But if it isn’t heat, then I would say the part size just gets big when you need an inner race (around shaft), bearings , then outer race, housed in a bracket. Lot cheaper for just the sacrificial part, till the wear like you show starts affecting other parts.





  • Assumptions: For the size a bearing can handle load better, and can be a self lubricating material. Ball bearings are small contact points, and a lot of off center vibration of the machine might wreck the ball bearing. Especially if it gets warm and grease runs out. So they would need to have a much larger ballbearing race like you see on industrial machinery, and the cost probably doesn’t justify it.

    My dryer seals broke this year, in replacing them I could see why they wore through. The back of drum wheels are just bearings (no balls), the weight of drum had the wheel bearings wear a wide groove in the support shafts so it shifted everything. And front has no bearings it just rides on the seal. I rotated/swapped them all around so they start with a fresh wear face and replaced a wheel. It should support itself better. Maybe we will get 5 more years out of it.