Grinding is an abrasive cutting action to meet dimensional accuracy and at same time smoother surface.Grinding removes saw marks and levels and cleans the specimen surface.Grinding uses fixed abrasives—the abrasive particles are bonded to the paper or platen—for fast stock removal.
The main purpose of the grinding step is to remove damage from cutting and to remove material approaching the area of interest.
Polishing is an super finishing operation which uses very fine abrasive just to improve roughness .Polishing removes the artifacts of grinding but very little stock.Polishing uses free abrasives on a cloth; that is, the abrasive particles are suspended in a lubricant and can roll or slide across the cloth and specimen.
The main purpose of polishing is to prepare specimen for microstructural analysis. It is the step which is required to completely eliminate previous damage.
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