Machine assembly for use in a manufacturing machine, in particular in a horizontal orientation of an axis of rotation in a horizontal manufacturing machine, comprising - a workpiece fixture which is mounted on a fixture carrier and has a first side and a second side, and - a first and a second tool holding fixture (10, 20), wherein - the first tool holding fixture is arranged on the first side of the workpiece fixture and the second tool holding fixture is arranged on the second side of the workpiece fixture, wherein - the workpiece fixture has a main spindle with an axis of rotation running from the first to the second side (31, 32), and is designed as the central main spindle for holding a workpiece at a central position along the axis of rotation, and - the main spindle has a rotatable hollow shaft, in the interior of which the workpiece can be held, characterized in that - the main spindle in the form of a rotatable hollow shaft is part of a hollow shaft motor, wherein - the main spindle has, on a side facing the interior thereof, radially feedable clamping means as hydraulic and/or pneumatic clamping means for securing the workpiece, wherein - the main spindle has a fixture for the workpiece, which fixture has a hydraulic and/or pneumatic clamping means, wherein the hydraulic and/or pneumatic clamping means has a pressure shell for receiving a pressure medium generated under piston operation on a clamping bushing for the hollow shaft, and - the first and/or second tool holding fixture (10, 20) is part of a series kinematic system, wherein a feeding direction of a tool is oriented along the axis of rotation of the main spindle and is oriented perpendicularly to an advancing direction of a workpiece. - a workpiece fixture which is mounted on a fixture carrier and has a first side and a second side, and - a first and a second tool holding fixture (10, 20), wherein - the first tool holding fixture is arranged on the first side of the workpiece fixture and the second tool holding fixture is arranged on the second side of the workpiece fixture, wherein - the workpiece fixture has a main spindle with an axis of rotation running from the first to the second side (31, 32), and is designed as the central main spindle for holding a workpiece at a central position along the axis of rotation, and - the main spindle has a rotatable hollow shaft, in the interior of which the workpiece can be held, characterized in that - the main spindle in the form of a rotatable hollow shaft is part of a hollow shaft motor, wherein - the main spindle has, on a side facing the interior thereof, radially feedable clamping means as hydraulic and/or pneumatic clamping means for securing the workpiece, wherein - the main spindle has a fixture for the workpiece, which fixture has a hydraulic and/or pneumatic clamping means, wherein the hydraulic and/or pneumatic clamping means has a pressure shell for receiving a pressure medium generated under piston operation on a clamping bushing for the hollow shaft, and - the first and/or second tool holding fixture (10, 20) is part of a series kinematic system, wherein a feeding direction of a tool is oriented along the axis of rotation of the main spindle and is oriented perpendicularly to an advancing direction of a workpiece.