A horizontal lathe machine includes a work spindle unit disposed on a middle portion of a machine base and proximate to a front side of the machine base for holding a workpiece in an X-direction, and two tooling turret units located at two opposite sides of the spindle unit and driven to move in the X-direction by X-direction driving units. Each turret unit has a saddle movable on the machine base in the X-direction, and a turret driven by a turret driving member to rotate about a turret axis in a Y-direction that is perpendicular to the X-direction for facilitating a tool changing operation.
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