In a former life I was an aircraft maintenance engineer for an airline and as an apprentice I spent some time overhauling big gas turbine engines. Lots of high tolerance bearings and labyrinth seals to control airflow and lubrication. The bearings had to be assembled wearing cotton gloves because the oils from one's skin were corrosive enough to effect the surface finish of the bearing causing premature wear and early failure.Rupes wrote:The plain bearing is a miracle of engineering when you consider how it works and the load it takes, doesn't take much grit to root that all to hell.
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