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Learn how the 8200 Planetary Mill prepares rock samples simply by grinding with a mechanical motion, rotating the jar in one direction while the platform (sun wheel) is rotated in the opposite direction. The mechanical milling is performed at a 2:1 ratio causing the container to rotate twice relative to every single rotation of the sun wheel. As the container is moved, the relative centrifugal force is transferred to the grinding balls causing them to move in a circular motion into each other and against the container wall, grinding the sample.