Machine and method for machining large crankshafts

Machine for the machining of large crankshafts, which allows the synchronisation of a rotation movement of said crankshaft (14), and comprises a machining tool (1) configured to move along at least one guide (2) between a first end supporting element (3) and a second end supporting element (4), where said end supporting elements (3, 4) are configured to anchor and transmit rotational torque to each end of the crankshaft (14), characterized in that

• it comprises a first electronic angular position sensor (6) situated on a first rotation shaft (7) of said first end supporting element (3), also comprising a second electronic angular position sensor (8) located on a second rotation shaft (9) of said second end supporting element (4), so that the rotation of said first end supporting element (3) is synchronised with the rotation of said second end supporting element (4), and in that
• it further comprises at least one intermediate supporting element (5) configured to move between said first end supporting element (3) and said second end supporting element (4),
• wherein said at least one intermediate supporting element (5) consists of a motorized steady rest configured to support the crankshaft (14) undergoing machining and to transmit a rotational movement to said crankshaft (14),
• wherein said at least one motorised steady rest comprises an intermediate electronic angular position sensor (10) configured to allow the rotational movement of said motorised steady rest to be synchronised with the movement of the end supporting element (3, 4) wherein said at least one intermediate supporting element (5) comprises a motor (11) configured to rotate independently, comprising means of rotational transmission by tangential engagement with the rotation shaft of the crankshaft (14) being machined, wherein the means of rotational transmission comprises two tangentially engaging rotation worm gears (12), configured to rotate a crown gear (13), and wherein said intermediate electronic angular position sensor (10) is situated on one of said tangentially engaging rotation worm gears (12).