Abstract: A polishing bath is charged with polishing materials so that workpieces may be barrel-polished. Supporting members for holding the workpieces in the polishing bath are provided and are set under their free or rotatable condition. According to this barrel polishing operation, the workpieces are prevented from colliding against one another during the polishing operation, thus raising no fear of forming the products with scars and dents.

Abstract: A grinding method wherein a work is moved along a grinding tank and on the surface of or in the interior of a grinding material, as required, while being rotated within the large grinding tank charged with the grinding material and a grinding apparatus comprising a large grinding tank charged with a grinding material a guide rail provided above and along said grinding tank, a main shaft rotating head moving along said guide rail and a chuck securing a work to the lower end of said head, whereby the work is moved in contact with the grinding material, as required, while being rotated. With these method and apparatus, it is possible to grind even a large work over the entire surface.