| 摘要 |
A drilling apparatus for hole processing comprises a drill bit main body; a central axis which is combined to the drill bit main body; a knife which is combined to the drill bit main body; and a knife fixing unit which is to fix the knife to the drill bit main body. The drill bit main body comprises an axis combination unit where the central axis is combined; an eccentric balance weight unit which is eccentrically formed to have an eccentric weight based on the center of rotation; and a knife mounting space unit where the knife and the knife fixing unit are mounted between cross sections which are formed to face each other by being cut in a circumference direction of the eccentric balance weight unit. |
