Abstract: A grinding attachment for porcelain bodies, comprising a rotary shaft having a flange and an externally threaded end portion; a plurality of groups of grinding wheels concentrically mounted on said rotary shaft and clamped between said flange and nut, said each grinding wheel in the respective groups including a support disk and a plurality of grindstone pieces equidistantly mounted on a circumferential end surface of said support disk and having their arcuate end surfaces disposed on one and the same circumferential surface, said grinding wheels being mounted on the rotary shaft in such a manner that the grind-stone pieces on the respective grinding wheels alternate with the grindstone pieces on adjacent grinding wheels in the circumferential direction.