Tumbling process: Tumbling process is used for removing rust and scale from metal parts. In this dry abrasive (deburring compounds) are effective for removing rust and scale from small parts of simple shapes. However parts with complex shapes, with deep recess and other irregularities, cannot be descaled uniformly by tumbling. It may require several hours if the method is used. The operation is accomplished by placing workpieces in a drum or barrel, and totally filled together with stars, jacks slugs or abrasive materials. The material can be sand, granite chips, slag. In operation, the barrel is rotated, and the movements of the workpiece and accompanying slugs or abrasive material against each other produces by friction a fine cutting action which removes the fins, flashes and scale from the product. Parts configuration and size are the primary limitations of the process