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You say "the force required to overcome the friction between two sliding surfaces is constant as long as the pressure between the two surfaces remains constant"But when you've started to move you get a momentum. How exactly do they define that friction there? From practical tests or theory.
I suspect it's because, at high speeds, the lubricant "can't get out of the way" fast enough, so it forms some sort of fluid boundary.
Quote from: Geezer on 04/03/2012 22:02:30I suspect it's because, at high speeds, the lubricant "can't get out of the way" fast enough, so it forms some sort of fluid boundary.Perhaps the topology of the worm gear is more akin to the foil bearing than it might first appear. Maybe something like fluid cavitation is playing a role as the speed increases, causing lubricant to be thinned out between the moving surfaces.Foil bearings remind me of being taught about the Winchester disk drive design at college - The read/write heads 'flying' a micron above the platters on a tiny bubble of air.