Portable machine tool for chip removal, designed primarily for axial alignment orrealignment, of large bodies bearing cylindrical cavities of axial / symmetrical, developed mainly in length, inaccessible and / or manipulated by conventional machine tools. Designed to carry out  " on-site " jobs,  overcomes the inability and/ or difficulties, the nature of business / logistics of moving such large bodies and their connections or structural obstacles, the place of location. Allows the adjustment of the mold, gas pipelines, gas pipelines and aqueducts. From Ø 500 mm to over 800 mm ø