None. The process is to machine the steel shell with a fine "phonograph" finish, clean/degrease with caustic soda (to remove cutting fluids and grease), rinse in water, build/set up your dams and fill gaps with lampblack, then spin up the shell while heating it to pouring temp then pour the babbitt. the thinner the babbitt, the higher the load bearing capacity (up to a point. at some point you have to go to a harder babbit like a cadmium based one.) Used to work at a place that made babbitted steel mill roll bearings.
Used to work at a machine shop over off Lockwood and Clinton Dr. called Forsyth machine (the buildings and machines are now owned by NOV) that was bought by Mesta Machine back when US Steel ran the Baytown steel mill. Then US Steel shuttered the place then Mesta went out of business and the shop got spun off on it's own. We still manufactured/remanufactured babbitted hydrodynamic steel mill roll bearings per both Mesta's design and Morgan's design as well. We also remanufactured rolls for paper and aluminum mills too. Dunno what happened to all the prints they had of every steel mill Mesta ever built dating back to the early 1900's along with the roll lathes and roll grinders that Mesta built to support the mills. Some of those prints were so fragile you couldn't even hardly get them out of the hanging file without tearing them.
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