More about Grinders

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Similar to crushers, milling grinders are devices used to break materials into smaller pieces. In a grinder, this process is achieved through a combination of churning, or attrition, and compression. Common household grinders are used on everything from coffee beans to meat, while industrial grinders are regularly used in cement production, ore crushing and chemical mixing.

The term grinder can also refer to grinding machines, which are abrasive machining devices used to finish, cut and shape metal and ceramic work pieces. Machinists use a wide assortment of grinding equipment, from centerless grinders and disc grinding machines to creep feed and surface grinders. The majority of these devices use a circular grinding wheel that contains bonded abrasive particles. As the wheel grinds the part, the abrasives dull and eventually break away, causing the wheel to become slightly smaller with each use. Certain grinding machines are also used to sharpen worn machine blades and components.

Milling grinders are vastly different in operation. A ball mill grinder, for example, is a rotating chamber that contains a multitude of metal balls. Materials enter the chamber, are ground by the movement of the balls, and are then expelled through the discharge aperture. Milling grinders also use metal rods, small stones and rollers to churn the work materials. In autogenous milling machines, the work materials serve as the primary grinding elements, and they are tumbled in a large grinding chamber. Milling grinders are employed on a wide range of materials, including ceramics, bone, fertilizer, glass and rock. Grinders are used on both wet and dry materials, although individual units are typically designed to handle one or the other, not both.