Abstract: A processing apparatus includes: an apparatus main body including a base portion that is movable and a liquid supply unit that supplies a liquid to the base portion; a chuck portion connected to the base portion and including an attachment hole that is open outward; and a processing tool detachably mounted on the chuck portion. The processing tool includes a cylinder fitted into and held by the attachment hole, a drive unit disposed inside the cylinder and including a rotating body to be rotated around a central axis by the liquid introduced from the liquid supply unit via the base portion, a rotary shaft protruding outward from an inside of the cylinder along the central axis to rotate integrally with the rotating body, and a tool portion connected to a tip of the rotary shaft.

Abstract: A processing apparatus includes: an apparatus main body including a base portion that is movable and a liquid supply unit that supplies a liquid to the base portion; a chuck portion connected to the base portion and including an attachment hole that is open outward; and a processing tool detachably mounted on the chuck portion. The processing tool includes a cylinder fitted into and held by the attachment hole, a drive unit disposed inside the cylinder and including a rotating body to be rotated around a central axis by the liquid introduced from the liquid supply unit via the base portion, a rotary shaft protruding outward from an inside of the cylinder along the central axis to rotate integrally with the rotating body, and a tool portion connected to a tip of the rotary shaft.

Abstract: A cutting tool comprises a shank having an insertion portion protruding from a shank main body, a head in which an insertion hole into which the insertion portion is inserted is formed, and a spacer disposed in a gap between the shank main body and the head. The insertion portion has a tapered outer circumferential surface which gradually decreases in diameter from the other side toward one side in the axial direction. The insertion hole has a tapered inner circumferential surface coming into surface contact with the tapered outer circumferential surface. A head end surface of the head which faces the other side in the axial direction comes into surface contact with a surface facing one side in the axial direction of the spacer.

Abstract: When a closed type impeller is manufactured from one block, a rough cutting process of cutting a flow path region of a block using a rough cutting tool, and a residue-cutting process of cutting a cutting residue in the cutting process using a residue-cutting tool are executed. The residue-cutting tool has a tool main body having a blade formed on an outer periphery thereof, and a handle having the tool main body fixed to a distal end thereof. A maximum outer diameter of the tool main body is larger than a minimum outer diameter of the handle. Further, the tool main body has a rear blade directed in a direction including a tool rear side component.

Abstract: A cutting tool comprises a shank having an insertion portion protruding from a shank main body, a head in which an insertion hole into which the insertion portion is inserted is formed, and a spacer disposed in a gap between the shank main body and the head. The insertion portion has a tapered outer circumferential surface which gradually decreases in diameter from the other side toward one side in the axial direction. The insertion hole has a tapered inner circumferential surface coming into surface contact with the tapered outer circumferential surface. A head end surface of the head which faces the other side in the axial direction comes into surface contact with a surface facing one side in the axial direction of the spacer.

Abstract: When a closed type impeller is manufactured from one block, a rough cutting process of cutting a flow path region of a block using a rough cutting tool, and a residue-cutting process of cutting a cutting residue in the cutting process using a residue-cutting tool are executed. The residue-cutting tool has a tool main body having a blade formed on an outer periphery thereof, and a handle having the tool main body fixed to a distal end thereof. A maximum outer diameter of the tool main body is larger than a minimum outer diameter of the handle. Further, the tool main body has a rear blade directed in a direction including a tool rear side component.