PURPOSE: To obtain long-life products in a simple manner at a high accuracy and a low cost by embedding diamond grindstones in a metal outer wheel, plating the outer surface of the metal outer wheel and conducting a dressing operation to remove excess plated metal.

CONSTITUTION: A roller 3 is formed into a predetermined shape by a surface grinder using a vitrified grindstone. A wheel 1 on which an outer ring 2 is shrinkage fitted is mounted on the spindle of the surface grinder so that the diameter of the outer ring 2 is smaller by a predetermined amount than that of the grindstone by which the roller 3 is formed. Grain 4 is agitated by an agitator 7 to be dispersed at a predetermined concentration into a medium 6. The roller 3 is then rotated to allow the medium 6 and grain 4 to be sticked to the outer surface thereof. At the same time, the grain 4 is embedded in the whole of the circumferential surface of the outer ring 2 while the outer ring 2 and wheel 1 are synchronously rotated. The outer ring 2 is then plated such that the grain 4 thereon is covered with a layer 8 of plating material. Excess plating material is thereafter removed by electrlysis to obtain a complete product.