Abstract
In barrel finishing by centrifugal disc type, the whole mass (media, workpieces and compound solution) generates the spiral flow intricately. Therefore, the finishing mechanism is not solved and it cannot be said that finishing conditions is not necessarily selected rationally. In order to solve this finishing mechanism, the relation between finishing conditions and the distribution of stock removal and finishing presser in the mass was considered experimentally. As a result, it became clear that the finishing power higher than the upper layer of mass has arisen in the lower layer of mass near the disk of a bottom.