A mechanical arrangement (1) for processing rod-like workpieces, especially pipes (2), has a processing device (20) for processing a workpiece, a workpiece-moving device (6) for moving workpieces (2) relative to the processing device (20), and a device (11) for supporting a workpiece in the direction of gravity. The device (11) for supporting a workpiece includes at least one support roller (13) which forms at its outer periphery a workpiece rest. The workpiece rest at the outer periphery of the support roller (13) extends about a roller rotation axis (14) of the support roller (13) at a changing center distance. The support roller (13) is rotatable about the roller rotation axis (14) in a controlled manner and is thereby positionable in different rotational positions.