| 摘要 |
The invention provides a machining center having a first main spindle unit and also a second main spindle unit with a ram shaft attached to a vertical machining center. A machining center 1 comprises a rotary table 20 that moves in the direction of an X-axis on a bed 10 , and a cross rail 40 supported by a column 30 and moving in the direction of a Z-axis. A first main spindle unit 60 is attached to a saddle 50 supported by the cross rail and moving in the direction of a Y-axis. The first main spindle unit 60 is equipped with a first main spindle 70 that rotates around a B-axis. A second main spindle unit 100 disposed between the first main spindle unit 60 and the saddle 50 is equipped with a ram shaft 110 that moves in the direction of a W-axis and a turning head or a milling head that is replaceably attached to the leading end of the ram shaft.
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