| 摘要 |
<p>Disclosed is a novel drill. The drill includes a point formed with cutting edges; one or more spiral flutes; and one or more lands formed between the spiral flutes, the lands bordering the flutes, wherein a groove with a predetermined depth is formed on the top surface of each of the lands, so that fluid can be supplied to the point of the drill along the groove. Accordingly, even though no oil hole is formed in a drill through a complicated manufacturing process, it is possible to stably supply the cutting oil to the point of the drill.</p> |
