Recently the file for precision machining is used as the finisher of the product manufactured by the NC machine tool etc. For this reason, the production spot needs the file for precision machining. The file for precision machining is small as compared with the file currently used until now in the production spot, and the form is also precise. Especially manufacture of the file with special cross-sectional form is difficult for manufacturing this by machine. For this reason, the skillful engineer is manufacturing by hand labor using grinding wheel. However, by a skillful engineer's aging, they are decreasing in number and the manufacturing process of these files needs to hurry automation. In this paper, the author designed and manufactured cheaply the grinding machine which can control x axis, y axis, and z axis which used the microcomputer. And the author made the surface grinding equipment of a file as an experiment using this equipment