Quote:
Originally Posted by Werner
Hello,
the circulating lubricating grooves are not good!
At that time in the past designers thought these grooves were necessary for the constant fat distribution.
Today it is known that these grooves interfere with the hydrodynamic pressure resistance of the lubricating film.
Therefore, all bearings have a smooth surface with a little rough-depth. (Never polished!)
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I believe the grooves are not there for anything to do with lubrication. It is more to do with the way they were made. A strip of the appropriate alloy steel was twisted into a cylinder, ground and hardened. The grooves are a result of the winding/twisting process.