Machining apparatus, method for using machining apparatus and chuck device

A machining apparatus comprising:

• a drilling machine;
• and a chuck device disposed to face the drilling machine and chucking a workpiece to be drilled by the drilling machine, the chuck device including therein as a collet chuck a tubular sleeve and a collet fitted into the sleeve and reduced in diameter by movement relative to the sleeve, the collet and the sleeve each having both end openings opened toward the outside of the chuck device, wherein
• the opening on one end side of each of the sleeve and the collet is directed to the drilling machine, wherein
• the collet is disposed on the other end side of the sleeve, and wherein
• one drilling machine is included as the drilling machine.

Method of using a machining apparatus, on a work oiece, wherein the machining apparatus includes a drilling machine, and a chuck device disposed to face the drilling machine and having a collet chuck includinga tubular sleeve and a collet fitted into the sleeve that is reducable in diameter by movement relative to the sleeve, the collet and the sleeve each having end openings opened toward the outside of the chuck apparatus such that the opening on one end side of each of the collet and the sleeve is directed to the drilling machine and that the collet is disposed on the other end side of the sleeve,

• wherein the work piece includes a stem part and a diameter-expanded part integrally disposed at one end portion of the stem part and expanded in diameter as compared to the stem part is prepared as the workpiece, wherein
• when the stem part of the workpiece is shorter than the axial length of the sleeve and drilling is performed from the other end surface of the stem part of the workpiece, the stem part of the workpiece is inserted into the collet from the opening on the other end side of the collet so that the stem part of the workpiece is held with the collet through relative movement between the collet and the sleeve, and wherein
• when the stem part of the workpiece is longer than the axial length of the sleeve and drilling is performed from an end surface of the diameter-expanded part of the workpiece, the stem part of the workpiece is inserted into the collet from the opening on the one end side of the collet so that the stem part of the workpiece is held with the collet through relative movement between the collet and the sleeve.

A chuck device comprising:

• a tubular main body having one axial end surface defined as a facing end surface facing a drilling machine and the other axial end surface defined as an end surface facing a space in which the drilling machine does not exist;
• a sleeve disposed in the tubular main body with an axial direction aligned with the axial direction of the tubular main body;
• and a collet fitted in the sleeve with an axial direction aligned with the axial direction of the sleeve, the collet and the sleeve having both end openings opened toward the outside of both axial ends of the main body, wherein
• the opening on one end side of each of the sleeve and the collet is directed to an opening of the facing end surface, and wherein
• the collet is disposed on the other end side of the sleeve.