A workpiece turning-over device includes a mounting wall, a gear driving mechanism, and a rotation mechanism. The gear driving mechanism comprises a toothed bar and a driving member. The driving member is able to drive the toothed bar to move. The rotation mechanism comprises a sleeve and a gear. The sleeve is rotatably attached to the mounting wall. A supporting portion extends from the sleeve to secure the workpiece thereon. The gear is fixedly coiled around the sleeve, engaged to the toothed bar, and is able to rotate to rotate the sleeve fixed thereto, thereby allowing the workpiece to rotate.

A steady rest for supporting a, particularly elongate, workpiece undergoing mechanical work and particularly machining, having: a steady rest main part that can be arranged in a device for machining a workpiece being machined, and at least one support arrangement which is disposed or designed on said steady rest main part and configured to support a workpiece being machined, and comprises at least one support element that supports a workpiece requiring support, wherein said at least one support arrangement is disposed or designed to be mounted on the steady rest main part such that it can move, relative to said steady rest main part, in at least one degree of freedom of movement which defines a path of movement.

A supporting device for supporting an, in particular elongate, workpiece that is to be mechanically processed, in particular machined. The supporting device includes a main body that can be arranged in a device for mechanical machining of a workpiece that is to be mechanically machined, at least one support that is arranged or formed on the main body and is intended for supporting a workpiece that is to be mechanically machined. The support includes at least one support element that supports a workpiece that is to be supported. The at least one support is arranged or formed on the main body so as to be movable, relative to the main body, in at least one degree of freedom of movement that defines a movement path.