I drive a dump truck, and frequently get sand/gravel from quarries. First, excavated native soil is screened to separate soil from rock. The rock is then sifted by size. Rocks that are a different size than popular sellable products are run through a crusher, then another sifting operation. The whole process involves lots of conveyor belts.
While waiting to get loaded, I was looking at a discarded motor that I know has been sitting there for over a year. It is a 10-HP 220V roughly the diameter of a soccer ball. When a conveyor belt is down, every minute they lose money. A new one is slapped on, and the old one is tossed aside. Occasionally, some are gathered for scrap weight.
A mechanic said he doesn't care if its the brushes, controller, bearings, or something else. No time to fiddle with them (perhaps two bad ones could make one good one?)
Every major city has a materials quarry, and the equipment is pretty universally the same. If there is any interest I will find out more information, I just wanted to pass this on as another possible motor supply option.
