Oil-mist lubrication system supplies very small quantity of oil with compressed air to end mill from a nozzle. Vegetable oil without any harmful substance is used in this paper. Thus troubles such as environmental pollution or deterioration of working environment caused by using large amount of cutting fluid are hardly caused by using this lubrication method. In this paper, this oil-mist lubrication is applied to high-speed milling of S45C steel, in which cutting speed is over 2000 m/min. Then the effects of its lubrication on tool wear are discussed. As a result of cutting tests, by using proposed oil-mist lubrication, tool wear becomes small compared with the case of no lubrication if cutting speed is lower than 750 m/min under the settled cutting conditions. It was also cleared that oil-mist supplying position affects tool wear. Tool life becomes longest when oil-mist is supplied at the disengage point in milling. And tool wear suppression effect of oil-mist become larger if the quantity of supplied oil increases up to 0.5cc/min.
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