The grinding is for sure the most important phase "the surface." A good grinding consents a to normal piece to be redy to be used or,if it is the case, to be sent to the polishing department where, the good preparation will a quick final excution. Technological development permit a wide use of abrasive belt at the point that actually we see it protagonist in workplaces that are highly technological and delicate. The abrasive belts has been able to reach this results thanking the granulometry more and more able to solve problem either for the fineness or the roughness; thanking the new quality of the abrasives used, but also the stratagem used in the production such as addition agents and similar.