When it comes to the mechanical components of ball mills – which are essential to any hard rock mining operation – the focus is often on the trunnion bearings. With diameters typically ranging from one to two meters, these bearings tend to steal the show. But it’s actually the pinion bearings, which are responsible for turning the ball mill around, that work the hardest.

Swivel type lead-bronze bushed trunnion bearings are generally furnished on large diameter ball Mills. The bushing is bored and scraped to fit the mill trunnion. The bushing is provided with end flanges thus assuring that the trunnion flanges run against a bronze face.

On smaller mills, rigid or swivel type bearings support the mill trunnions. The lower half of such bearings are lined with bronze or a special mill babbitt which is peened in place and bored to fit the trunnion.

In all cases, a low bearing pressure is maintained to assure freedom from overheating, long life, and minimum maintenance. They are designed to provide support to the mill proper, its media, and pulp load.

Trunnion bearings are generally supplied with seals for use with a circulating oil lubrication system. They can be designed to accommodate block grease or oil with wool waste.

In many dry grinding applications, or where heat is developed, the trunnion bearings can be furnished for water cooling. This system carries away the excess heat transmitted through bearings and protects them.

Ball mill or trunnion bearings are widely used in wind turbine generators, communications satellites, the space shuttle, telescopes, bascule bridges, vacuum cleaners, firearms, vehicles, stage lighting instruments, and in many other areas as well.

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