Patent ID: 7500297

Claim:
A vertical machining center having a table disposed horizontally and a processing unit disposed perpendicularly, wherein the processing unit comprises a first main spindle unit disposed on a saddle, and a second main spindle unit having an axis of movement that is parallel to the axis of movement of the first main spindle unit; the first main spindle unit comprises a first processing head disposed rotatably around a B-axis orthogonal to a Z-axis and a rotating mechanism that rotates the first processing head around the B-axis; the second main spindle unit comprises a ram shaft controlled to move in a W-axis direction parallel to a Z-axis, a ram head attached to a lower end portion of the ram shaft, and a turning head and a milling head replaceably attached to the ram head; and the ram head comprises a hydraulic clamp unit that replaceably supports the turning head or the milling head.