| 摘要 |
The invention provides a drill head for deep hole machining capable of raising circularity and straightness of a hole and improving precision of hole machining. In the drill head for deep hole machining constituted by fixing a cutting blade 2 to a tip surface of a head body 1 and fixing guide pads 3 and 4 to a periphery of a tip of the head body 1, the length Lm of a margin 6, which is formed at a tip side of a periphery of the cutting blade 2 in a drill rotating direction, in an axis direction is made substantially the same as the length Lp of the guide pads 3 and 4 in the axis direction, and a top end and rear end of the margin 6 are substantially aligned with a top end and rear end of the guide pads 3 and 4, respectively, in a circumference direction. |
