This machine tool is special sharpening equipment which is used for thinning and repairing various hard mental circular sawbit. It will perfect grinding effect with steady machinery structure, function of accurately and automatically stiring gears, advaced and reliable electric control, and perfect cooling system. It will meet grinding requirements of various angle with geometrical rotatable design of engaging in woodworking, manufacture of artificial board, furniture, watercrafts, architectural doors and windows, manufacture and processing of sawbit, sales of tool sharpening equipments, and so on.