Machining of all kinds of shafts, drilling them, sawing and cutting is difficult due to the shape that is difficult to attach to traditional instruments. The processed shaft is placed in the pile, but the use of the other, even smaller, it will enable a strong fixing of the shaft with a typical screw clamp. Strongly clamping each shaft in two piles will completely immobilize it, preventing rotation during machining, e.g.. cut, sawing or drilling holes.
