From the research which has been presented roller bearings have been chosen for use in the crane because of the load that they will experience in this application. This is because they will experience a high radial load with a negligible thrust load, which is what this type of bearing is designed to cope with. They have also been chosen as they are available as a sealed cartridge unit which requires no maintenance in it's lifecycle. This makes them preferable to plain bearings because although they have a greater resistance to axial load, they require good lubrication to work and maintenance to keep them in working order.
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