PURPOSE:To facilitate the setting of the degree of surface roughness by a method wherein the menu of the degree of surface roughness is indicated in a display and working conditions are operated and indicated automatically by selecting a key switch in accordance with the menu. CONSTITUTION:When a stage to input the data of the degree of surface roughness has come in a process inputting a working program, the menu of the degree of surface roughness is indicated automatically on the display 12 on an operating board. When the desired degree of surface roughness is selected by key boards 16-1-16-9 provided in corresponding to the menu 14, the feeding speed of the main shaft is operated from the revolving speed of the main shaft and the diameter of the nose of a tool.
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