Grinding operations are typically used when parts requiring high surface finish and dimensional accuracy are to be manufactured, when machining hard materials, or when a high removal rate is required. Sanders are used for removing non-ferrous metals such as aluminum. Non-ferrous metals tend to clog grinding wheels, quickly making them useless for grinding soft metals, while belt sanders continue to grind without clogging. This is because the small grooves in the sand paper are opened up as they go around the arc of the drive wheel. - Wikipedia

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