In this research, forced cooling using mist of strong alkaline water for restraining thermal deformation on a machine tool was developer and evaluated. There are the corrosion resistance of several materials without aluminum, copper and their alloys in alkaline water. Thermal deformations of the bench lathe were effectively restrained by mist of strong alkaline water. When mist of alkaline water was used in the cutting territory, tool temperature during cutting with steel could reduce to 60 %, surface roughness on the work piece at limit of tool life could improve 50 % and the tool life becomed 2.4 times.
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