Abstract: A machine tool comprises an upstanding column, a tool-driving unit vertically movable on the column, and a pair of guide rails on a front surface of the column to extend vertically thereon and horizontally spaced apart from each other for guiding the upward and downward movement of the tool-driving unit. The tool-driving unit includes a lift frame on the guide rails and a tilting-type turret head which is supported on a front surface of the lift frame and is rotatable about an axis inclined relative to the longitudinal direction of the frame in a horizontal plane. One of the pair of guide rails is relatively disposed forwardly of the other guide rail, so that the individual guide rails both assume positions close to the turret head thereby to minimize the amount of overhang of the tool-driving unit.

Abstract: The present invention is directed to a gang head for a replaceable gang head type machine tool. The machine tool includes a base, a jig table, a driving member mounted on the base and movable to an advance and retract with respect to the jig table, and an annular rail surrounding the driving member. The annular rail has a rear stationary rail and a movable front rail, the movable rail movable to advance and retract with respect to the jig table along the same direction as the driving member. The gang head comprises a base frame mounted on the movable rail, a working unit mounted on the base frame, wherein the working unit is inclined at an angle other than a right angle, with respect to the direction of advance and retraction of the movable rail, an oil pressure pump, and an oil pressure operated cylinder. The oil pressure cylinder being operatively coupled to the working unit for advancing and retracting the working unit with respect to the jig table.