Machine tool for machining connecting rods for a reciprocating piston engine, preferably a reciprocating piston engine of an automobile or a truck, comprising: at least two workpiece carrier assemblies each including a workpiece carrier for supporting at least one workpiece ; at least two workpiece carrier supports , each workpiece carrier assembly being supported on a respective one of said workpiece carrier supports for horizontal movement in a first direction on said respective workpiece carrier support , said first direction being parallel with a horizontal Z axis; at least a first tool carrier configured for carrying at least one tool for machining at least one workpiece by rotating said tool around an axis parallel with said Z axis; a tool carrier support , said first tool carrier being supported on said tool carrier support for horizontal movement in a second direction on said tool carrier support, said second direction being parallel with a horizontal X axis, said X axis being perpendicular to said Z axis; said first tool carrier being displaceable on said tool carrier support in said second direction between at least one operative position (A) in which said first tool carrier is facing one of said workpiece carrier assemblies , and at least one inoperative position (B) in which said first tool carrier is not facing any workpiece carrier assembly ; wherein the machine tool further comprises a second tool carrier , said second tool carrier being configured for carrying at least one tool for machining at least one workpiece by rotating said tool around an axis parallel with said Z axis, said second tool carrier being supported on said tool carrier support for horizontal movement in the second direction, between an operative position (A) in which said second tool carrier is facing one of said workpiece carrier assemblies , and an inoperative position (B) in which said second tool carrier is not facing said workpiece carrier assembly . at least two workpiece carrier assemblies each including a workpiece carrier for supporting at least one workpiece ; at least two workpiece carrier supports , each workpiece carrier assembly being supported on a respective one of said workpiece carrier supports for horizontal movement in a first direction on said respective workpiece carrier support , said first direction being parallel with a horizontal Z axis; at least a first tool carrier configured for carrying at least one tool for machining at least one workpiece by rotating said tool around an axis parallel with said Z axis; a tool carrier support , said first tool carrier being supported on said tool carrier support for horizontal movement in a second direction on said tool carrier support, said second direction being parallel with a horizontal X axis, said X axis being perpendicular to said Z axis; said first tool carrier being displaceable on said tool carrier support in said second direction between at least one operative position (A) in which said first tool carrier is facing one of said workpiece carrier assemblies , and at least one inoperative position (B) in which said first tool carrier is not facing any workpiece carrier assembly ; wherein the machine tool further comprises a second tool carrier , said second tool carrier being configured for carrying at least one tool for machining at least one workpiece by rotating said tool around an axis parallel with said Z axis, said second tool carrier being supported on said tool carrier support for horizontal movement in the second direction, between an operative position (A) in which said second tool carrier is facing one of said workpiece carrier assemblies , and an inoperative position (B) in which said second tool carrier is not facing said workpiece carrier assembly . <EOS>