Patent ID: 8555756

Claim:
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 ).