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My understanding is that an anti friction bearing is a roller bearing, it has a point or line contact and a journal bearing supports supports  a shaft and has surface contact. I also think speed has something to do with it, roller bearings are lower speed while journal bearing are high speed

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On Sunday, June 05, 2016 at 11:36 AM, Jake Danger said:

My understanding is that an anti friction bearing is a roller bearing, it has a point or line contact and a journal bearing supports supports  a shaft and has surface contact. I also think speed has something to do with it, roller bearings are lower speed while journal bearing are high speed

 

You are right with the difference but not with the Selection according to application,like rollerbearing are used in high-speed And friction bearing in high load application. As friction increases with increased area but load carrying capacity increases with larger area contact.

Further there are lot of application data required to select bearing type for better life.

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