REVERSE ELECTROPLATING - For accuracy
A layer of nickel is electroplated onto the internal surface of a hollow cylindrical mould, to hold a single layer of diamonds firmly in place.A steel body is fitted then the mould is removed, exposing the diamond surface. Because all of the diamond cutting points lie on the 'surface of revolution' created in the mould machining operation, this method produces the most accurate type of rotary truer available.