The present invention is aimed at the mechanical industry sector and relates to a turning machine tool (1), suitable for machining delicate pieces of the casing type (B), which must be handled with care to avoid damage, scratches, dents, etc., comprising a substantially cylindrical body with a thin wall, a first end (B1) closed and a second end (B2) open so that said body is hollow. Said machine tool (1) comprises: a frame structure (2) for support and resting on the ground; feeding means of pieces to be machined and a mandrel (4) comprising a hole (5) for housing a piece to be machined and jaws (6) for gripping and holding said piece in position; first motor means (M1) adapted to rotate said mandrel; a first tool (7) suitable for machining a first end of said piece, and a second tool (8) suitable for machining a second end of said piece; means for unloading the machined pieces; a command and control unit (100). Said machine tool (1) is characterized in that said second tool (8) is placed on the opposite side of said first tool (7) with respect to said mandrel (4), so as to allow said machine tool (1) to simultaneously machine said first and second ends of the piece held by said single mandrel (4).