The definition includes all cutting, grinding and polishing materials of diamond and CBN. The diamond grit sizes are classified in natural and synthetic grain as well as synthetic grain with metal coating.

Synthetic diamond grain with several shapes of grain in kinds of bonds, decisive advantages to grinding ability and life.

In certain bonds, a metal-clad synthetic diamond grain has a beter adherence, by this means a premature break-down and dislodging of the diamond particle are avoided. Due to good caloric conductibility of diamond, the produced grinding heat is uniformly transmitted through the metal coat to the resin bond. The bond, surrounding the diamond, does not become too hot, and the adherence of the diamond endures.

Course grits cut faster but produce rougher finishes. Fine grits give fine finishes but cut slower. Grit size selection is a trade-off between removal rate and finish.

It can be seen that FEPA Standart for ‘sieve’ grit sizes ends with D46/B46 as the finest grit size. The grit series is continued downwards by the ‘micron powder sizes’ which are classified chiefly by an elutriation CBN grit sizes have only minor effect on workpiece surface process. There is a FEPA Standart in existence for the micron grit sizes; DİABOR Standart uses a different classification with the designations D25. . . D0.25 for diamond and B30…B1 for CBN.

Features of Grit Sizes in Diamond and CBN