COMPOUND MACHINING DEVICE

PROBLEM TO BE SOLVED: To dispense with oscillating mechanism, thereby economizing the space for machining lines, to simplify the equipment, and to reduce the manufacturing cost on a work to be machined. SOLUTION: A compound machining device is provided with a main spindle 32, which is concurrently used for a main spindle for boring and that for honing and a divergent, tapered part 52 is formed at its tip end, and an inner member 34A, in which an inner tapered surface 62 corresponding to the tapered part 52 of the main spindle 32 is formed at its tip and inner peripheral surface, in order to support the tip-end side of the main spindle 32 in a freely rotatable manner and also to support in a freely rotatable manner both a first supporting member 34, which can freely slide in the axial direction, and the retreating side of the main spindle 32. The compound machining device is also provided with a second supporting member 36, which can freely slide in the axial direction, a braking member 76, which can freely fix the first supporting member 34 on a sliding track, a pressure contacting means 90, which is installed in the second supporting member 36 in order to join with pressure the tapered part 52 of the main spindle 32 to the inner tapered surface 62 of the inner member 34A of the first supporting member 34A, and a slide driving 38, which can freely slide either both first and second supporting members 34, 36 as an integrated body or only the second supporting member 36.