Greaseless ball bearings: A revolutionary spin on a design that's been around for ages

While the ball bearing might be among Leonardo Da Vinci's less celebrated inventions, it's arguably one of his most important. Though it was initially designed as part of his failed helicopter invention, it has stood the test of time – there are ball bearings of a similar design to Leonardo's in just about every moving machine.

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What are the different types of bearings and which is the best and why? How do they work? - Quora

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