Abstract: A C-axis unit for a machine tool, the C-axis unit comprising a bushing (134) adapted to be fixed to a unit support (121) of the machine tool; a head mounting platform (130) adapted to receive an operating head (40), the head mounting platform being supported by the bushing (134) and being rotatable relative to the bushing (134) around a vertical axis; a platform rotation motor (150) supported by the bushing (134) and configured to control the rotation of the head mounting platform (130); and a spindle motor (160) configured to control the rotation of a tool-carrying spindle (45) on the operating head (40) through a driving extension (163) arranged in a through-bore (133) obtained through the head mounting platform (130). The spindle motor (160) is fixed to and is rotationally integral with the head mounting platform (130).

Abstract: A C-axis unit for a machine tool, the C-axis unit comprising a bushing (134) adapted to be fixed to a unit support (121) of the machine tool; a head mounting platform (130) adapted to receive an operating head (40), the head mounting platform being supported by the bushing (134) and being rotatable relative to the bushing (134) around a vertical axis; a platform rotation motor (150) supported by the bushing (134) and configured to control the rotation of the head mounting platform (130); and a spindle motor (160) configured to control the rotation of a tool-carrying spindle (45) on the operating head (40) through a driving extension (163) arranged in a through-bore (133) obtained through the head mounting platform (130). The spindle motor (160) is fixed to and is rotationally integral with the head mounting platform (130).

Abstract: The machine tool comprises a fixed bearing structure, a movable bearing structure supported by the fixed bearing structure and displaceable with respect thereto along a horizontal direction, a tool-carrying carriage mounted vertically translatable in the movable bearing structure between an upper end position and a lower end position, situated at respective heights or levels separated by a predetermined vertical distance, and a motor adapted to cause a horizontal displacement of the movable bearing structure with respect to the fixed bearing structure and/or a vertical displacement of the tool-carrying carriage with respect to the movable bearing structure. The fixed bearing structure is configured such that the movable bearing structure is supported and driven in its displacement at a height or level intermediate between the heights or levels of the end positions of the tool-carrying carriage.