Abstract: A method for screw driving and quality control of screw driving operations on a production line having a succession of workstations. The method includes at least: carrying out at least one screw driving operation on a structure to be assembled at at least some of the workstations, each screw driving operation carried out at a workstation being carried out via a screw driving device dedicated to the corresponding station and screw driving operation; quality control of the at least one screw driving operation, which is carried out at a workstation after the workstation where the verified screwing operation was carried out. The quality control is carried out via a screw driving device dedicated to the later station.

Abstract: An electric screwdriver includes a housing, a motor having a rotor and a maximum torque at constant speed of Cmax, and an end member. A transmission drives the end member and has a reduction gear coupled to the motor and having a ratio R and an efficiency ?. A torque sensor detects an attainment of a set value torque Cc. A motor driver drives the motor with a series of electric current impulses, The transmission enables an accumulation of kinetic energy Ec in the rotor and a restitution to the end member of the kinetic energy Ec between two impulses from the motor driver. The motor and reduction gear are configured such that: R*?*Cmax<Cc, the set value of torque Cc being attained through the transfer of kinetic energy Ec to the end member, wherein ratio R is smaller than or equal to 10/(?Cmax).