World's largest bearings - video and photos

[Toolmaker51]

After seeing diyfixman's excellent Metal bender from a large bearing, like all good people, I searched for "world's largest bearing"..........
The research lens of "bearing" weaves nicely throughout industry, history, photography, vehicles, military, etc.

Origin unknown; labeled as "Biggest bearing".

Photo, notice inspector is gauging the OD with a indicator bar. The standard would be stored elsewhere temp-controlled, due to size and value. Thats only checking size, not roundness, unless the indicator is spaced between two more contact points.

I recall a story about ball bearings; their durability held up development of turbines and jet engines. At that time softer materials were used, and races would indent from stationary balls. Experimental aircraft had auxiliary motors to spin main-shafts and circulate lubricant continually at low speed.