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I'm being told that the bronze journal bearing corresponding to a stainless steel shaft requires some time to "break in". Please note that these are used bearings that have been removed and installed into new bearing housings.

What is actually happening when a bearing like this one is being "broken in"? I'm not sure if I understand what could be causing initial temperatures to be higher than anticipated. I know that friction from the grease should be what causes the rise in temperature? Thank you in advance.

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  • $\begingroup$ That seems a poor saving "used bearings that have been removed and installed into new bearing housings" given the likely cost of the new housings compared to new bearings... $\endgroup$
    – Solar Mike
    Commented Jun 3 at 12:56
  • $\begingroup$ I've never seen a journal bearing run on grease. $\endgroup$
    – Tiger Guy
    Commented Jun 3 at 16:21
  • $\begingroup$ @SolarMike It was not my decision, and I agree to some extent. $\endgroup$
    – Adrian Beltran
    Commented Jun 4 at 19:40
  • $\begingroup$ @TigerGuy machinerylubrication.com/Read/779/journal-bearing-lubrication $\endgroup$
    – Adrian Beltran
    Commented Jun 4 at 19:41
  • $\begingroup$ @AdrianBeltran talk about bushings if you want to understand bushings. $\endgroup$
    – Tiger Guy
    Commented Jun 4 at 22:02

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