Abstract: A cutting tool is provided to process a processed member having an opening portion with a curved inner surface, so that a through hole is formed and a part of the inner surface of the opening portion corresponding to the through hole is processed. The through hole extends from a surface of the processed member to reach the opening portion. The cutting tool includes a shank member, and a processing member having a smaller diameter than the shank member. A groove portion of the processing member has a cutting edge, and a chip evacuation groove through which chip is expelled outward. A self guide portion of the processing member is arranged between the groove portion and the shank member and provided with a substantially cylindrical shape, to guide the cutting edge toward the part of the inner surface of the opening portion corresponding to the through hole in the processing.

Abstract: A processing machine has a main spindle apparatus and a tool holder which clamps a working tool. The main spindle apparatus detachably supports the tool holder and rotates. Oil mist is transported to the working tool through a lubricant supplying pipe in the main spindle apparatus. A coolant hose is formed in the tool holder. A supporting member is composed mainly of a sleeve and a draw bar. The supporting member air-tightly supports the coolant hose of the tool holder. A ring-shaped packing is placed between the lubricant supplying pipe and the supporting member in order to prevent any leakage of the oil mist. The periphery of the packing has two divided sub-parts of a character “Y” shape. The leaking oil mist expands one sub-part of the packing to air-tightly seal the gap formed between the lubricant supplying pipe and the draw bar.

Abstract: A cutting tool for processing a nonferrous metal member by rotation has a body portion and a cutting edge arranged at the body portion. The body portion has a coolant supply hole through which a coolant is supplied for the nonferrous metal member in processing, and a chip evacuation groove which has a substantially helical shape and through which chip of the nonferrous metal member generated in the processing is expelled. The cutting edge is made of diamond grains and a binder material. An opening of the coolant supply hole is arranged at the cutting edge.

Abstract: A cutting tool is provided to process a processed member having an opening portion with a curved inner surface, so that a through hole is formed and a part of the inner surface of the opening portion corresponding to the through hole is processed. The through hole extends from a surface of the processed member to reach the opening portion. The cutting tool includes a shank member, and a processing member having a smaller diameter than the shank member. A groove portion of the processing member has a cutting edge, and a chip evacuation groove through which chip is expelled outward. A self guide portion of the processing member is arranged between the groove portion and the shank member and provided with a substantially cylindrical shape, to guide the cutting edge toward the part of the inner surface of the opening portion corresponding to the through hole in the processing.