Case 1: Grain breaks out of  ceramic bond (bulk wear)— Wheel stays sharp, but loses  size.

Case 2: Grain dulls (attritional  wear)— Wheelkeepsdimension;  surfacefifinishimproves; grinding  force is high; risk of burning.

Case 3–a: Grain fracture of  mono crystal (fracture wear)— Wheel dulls somewhat and  loses some dimension.

Case 3–b: Grain fracture along  particle boundaries of sintered  grain—Dimension is stable;  wheel is always very sharp.

Sintered aluminum oxide grains comprise of particles in a measure run of a tenth  of a micron. This clarifies the contrast in break characteristic between routine aluminum  oxide and sintered grains. Ordinary grains, as appeared in Figure 1a, left-break like a  mono gem. A grain, sintered from a few hundred million aluminum oxide particles—as  appeared in Figure 1b—will create a break that about jam the original size of the grain and creates a high number of cutting edges. It often appears that the sintered grain  structure has rake and relief angles. The wheel wear rate versus the metal removal  rate is an indication of how much wheel wear occurs during a certain material removal.  This indicator also reveals how frequently redressing is required and what the life will be  of a complete grinding wheel. Regarding sintered aluminum oxide, the wheel wear is  almost independent from the metal removal rate. Usual metal removal rates in bevel  gear grinding lead to about a third of the grinding wheel wear, as compared to  conventional aluminum oxide.

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