4.2 Grinding machines,Grinding is the most important of the abrasive processes ,and it is the most common of all metalworking operations. Grinding is traditionally used to finish parts whose geometries have already been created by other operations. In addition to these traditional uses, applications of grinding are expanding to include more high-speed , high-material-removal operations,Compare to other machining, abrasive machining processes have three characteristics. 1. each cutting edge is ve