Through the analyses of the mechanism of the machined surface formation

the formation of machined surface and the deformation coefficient in micro machining are analyzed with consideration of the existence of rounded edge radius. The cutting force and chip deformation are presented theoretically. Moreover

the factors such as the cutting speed

feed

cutting depth

tool material

and workpiece material which affect the cutting force and surface formation are revealed based on the experiments process. In micro machining

the deformation coefficient is more than that of in macro machining. To reduce the rounded edge radius will reduce the contact length between the flank face and the workpiece

the deformation of uncut metal under the tool edge

and it is benefit to obtain a desirable finish of the machined surface.