A machine tool comprising: a machine frame; at least one first working spindle which is mounted so as to be rotatable about a first spindle axis; at least one second working spindle which is mounted so as to be rotatable about a second spindle axis; a workpiece clamping device which is configured to receive at least a first workpiece and a second workpiece, wherein the first working spindle and the second working spindle are arranged vertically one above the other, wherein the workpiece clamping device comprises at least a first workpiece table and a second workpiece table, wherein the first workpiece table is mounted so as to be pivotable about a first pivot axis, which is aligned parallel to a horizontal X-axis, and the second workpiece table is mounted so as to be pivotable about a second pivot axis, which is aligned parallel to the X-axis, characterized in that the workpiece clamping device comprises at least a first rear workpiece table and a second rear workpiece table, wherein the first rear workpiece table is mounted so as to be pivotable about a first rear pivot axis which is aligned parallel to a horizontal X-axis, and the second rear workpiece table is mounted so as to be pivotable about a second rear pivot axis which is aligned parallel to the X-axis, and that the first workpiece table and the second workpiece table are arranged on a first side of a swivel bridge, which is mounted such that it can be pivoted about a swivel bridge axis aligned parallel to the X-axis, and that the first rear workpiece table and the second rear workpiece table are arranged on a second side of the swivel bridge, wherein, depending on the swivel position of the swivel bridge the first working spindle is assigned to the first workpiece table and the second working spindle is assigned to the second workpiece table or the first working spindle is assigned to the first rear workpiece table and the second working spindle is assigned to the second rear workpiece table. a machine frame; at least one first working spindle which is mounted so as to be rotatable about a first spindle axis; at least one second working spindle which is mounted so as to be rotatable about a second spindle axis; a workpiece clamping device which is configured to receive at least a first workpiece and a second workpiece, wherein the first working spindle and the second working spindle are arranged vertically one above the other, wherein the workpiece clamping device comprises at least a first workpiece table and a second workpiece table, wherein the first workpiece table is mounted so as to be pivotable about a first pivot axis, which is aligned parallel to a horizontal X-axis, and the second workpiece table is mounted so as to be pivotable about a second pivot axis, which is aligned parallel to the X-axis, characterized in that the workpiece clamping device comprises at least a first rear workpiece table and a second rear workpiece table, wherein the first rear workpiece table is mounted so as to be pivotable about a first rear pivot axis which is aligned parallel to a horizontal X-axis, and the second rear workpiece table is mounted so as to be pivotable about a second rear pivot axis which is aligned parallel to the X-axis, and that the first workpiece table and the second workpiece table are arranged on a first side of a swivel bridge, which is mounted such that it can be pivoted about a swivel bridge axis aligned parallel to the X-axis, and that the first rear workpiece table and the second rear workpiece table are arranged on a second side of the swivel bridge, wherein, depending on the swivel position of the swivel bridge the first working spindle is assigned to the first workpiece table and the second working spindle is assigned to the second workpiece table or the first working spindle is assigned to the first rear workpiece table and the second working spindle is assigned to the second rear workpiece table.