The subject innovation is a coolant to be directly supplied to the processing surface to form a cutting oil to the tip of the injection port that relates to a coolant supply portion lathe processing, and more particularly bytes.; Designed present for this purpose is the in the coolant supply device for supplying a cutting oil to the contact surface of the Manufacturing Process of the inner diameter, outer diameter of the workpiece the workpiece and bytes, screwed to the end of coolant supply ball, the cutting oil supply hole formed in the byte to consist of cutting oil supply pipe is coupled to the nipple and the nipple, therefore possible to supply the cutting fluid directly to the contact surface of the workpiece and the byte, it is possible to extend the damage, as well as byte life of the prevention of the workpiece due to heat generated during processing.
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