There are many materials difficult to machine, such as stainless steels. From a technical standpoint, hot grinding apperars feasible for those materials. It is expected that the metal at elevated temperatures could be removed faster and with less power than could be metal at room temperature. Hot grinding will result in less metallurgicall damage and surface finishes. The present paper describes the results obtained by the grinding experiments of stainless steels at elevated temperature. When the material temperature is about 400°C, grinding force and surface roughness shows a minimum value, and grinding ratio shows a maximum value. Excess cut, that is concave shape, at the central portion of ground surface is observed. The amount of excess cut shows a minimum value at about 400°C, and also the residual stress on machined surface shows a minimum value at the temperature.