Preferably, the ambient temperature of a machine tool does not vary. When there are temperature variations, the dimensional accuracy of the machining work suffers because workpieces expand or contract or the machine tool deforms. Air conditioning is required to control these conditions. The subject of the present study was a new air conditioning system installed at a machining factory. At first the air conditioning system was set to the conditions recommended by its manufacturer, but the assured temperature range under these conditions was too wide. Since the system was designed by the manufacturer,the system design could not be altered. The problem was how well the system could be optimized using conditions that could be controlled by the user. The purpose of this study was to employ conditions that the user could adjust to reduce temperature variations in the factory and run the air conditioning system efficiently. As a result of the study, optimum air conditioning settings were found, the factory temperature was kept stable throughout the year, and the air conditioning system used less power.
