Apparatus for processing groove

An apparatus for processing a groove of a predetermined depth on an interior circumference of a cylinder bore, the apparatus comprising:

• a holder fixable to a main shaft of a machining center and formed with bolt holes on a lower surface;
• a frame having a fixing end formed at an upper portion, the fixing end being formed with slots corresponding to the bolt holes, a mounting end at a central portion, and a supporting end at a lower portion, where the fixing end, the mounting end, and the supporting end are formed toward a same direction;
• an inner slip ring mounted on the holder by being fitted to an exterior circumference of a lower end portion of the holder, and connected an electrical cable to transmit electrical power;
• an outer slip ring positioned in contact with an outer circumference of the inner slip ring allowing a slip, and connected to a cable to receive an electrical power;
• a motor mounted on a front end of the mounting end of the frame in a downward direction, connected to the inner slip ring through the electrical cable to receive electrical power, and having a rotation shaft rotatably supported by the mounting end and the supporting end of the frame;
• a cutting tip coupled with the rotation shaft of the motor through a tip holder mounted on a lower end surface of the rotation shaft;
• and
• a fine position adjustment unit of a rack and pinion structure configured between the lower surface of the holder and the fixing end of the frame, such that a position of the cutting tip with respect to a central axis of the holder can be finely adjusted;
• wherein the fine position adjustment unit comprises:
• a rack formed on the lower surface between the bolt holes on the holder;
• and
• a pinion engaged with the rack and rotatably installed in an interior space between the slots of the fixing end of the frame.